Begin switching to JSpecify annotations (#11448)

* Begin switching to JSpecify annotations

* more

* fixes

patches/api/Add-BeaconEffectEvent.patch

@@ -19,11 +19,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.block.BlockEvent;
 +import org.bukkit.potion.PotionEffect;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a beacon effect is being applied to a player.
 + */
++@NullMarked
 +public class BeaconEffectEvent extends BlockEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -35,7 +36,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public BeaconEffectEvent(@NotNull Block block, @NotNull PotionEffect effect, @NotNull Player player, boolean primary) {
++    public BeaconEffectEvent(final Block block, final PotionEffect effect, final Player player, final boolean primary) {
 +        super(block);
 +        this.effect = effect;
 +        this.player = player;
@@ -47,7 +48,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Potion effect
 +     */
-+    @NotNull
 +    public PotionEffect getEffect() {
 +        return this.effect;
 +    }
@@ -57,7 +57,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param effect Potion effect
 +     */
-+    public void setEffect(@NotNull PotionEffect effect) {
++    public void setEffect(final PotionEffect effect) {
 +        this.effect = effect;
 +    }
 +
@@ -66,7 +66,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Affected player
 +     */
-+    @NotNull
 +    public Player getPlayer() {
 +        return this.player;
 +    }
@@ -86,17 +85,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-BlockBreakBlockEvent.patch

@@ -12,20 +12,20 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 @@ -0,0 +0,0 @@
 +package io.papermc.paper.event.block;
 +
++import java.util.List;
 +import org.bukkit.block.Block;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockExpEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+
-+import java.util.List;
 +
 +/**
 + * Called when a block forces another block to break and drop items.
 + * <p>
 + * Currently called for piston's and liquid flows.
 + */
++@NullMarked
 +public class BlockBreakBlockEvent extends BlockExpEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -34,18 +34,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final List<ItemStack> drops;
 +
 +    @ApiStatus.Internal
-+    public BlockBreakBlockEvent(@NotNull Block block, @NotNull Block source, @NotNull List<ItemStack> drops) {
++    public BlockBreakBlockEvent(final Block block, final Block source, final List<ItemStack> drops) {
 +        super(block, 0);
 +        this.source = source;
 +        this.drops = drops;
 +    }
 +
 +    /**
-+     * Gets the drops of this event
++     * Gets a mutable list of drops for this event
 +     *
 +     * @return the drops
 +     */
-+    @NotNull
 +    public List<ItemStack> getDrops() {
 +        return this.drops;
 +    }
@@ -55,18 +54,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the source
 +     */
-+    @NotNull
 +    public Block getSource() {
 +        return this.source;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-BlockBreakProgressUpdateEvent.patch

@@ -17,20 +17,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Range;
 +
 +/**
 + * Called when the progress of a block break is updated.
 + */
++@NullMarked
 +public class BlockBreakProgressUpdateEvent extends BlockEvent {
++
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final float progress;
 +    private final Entity entity;
 +
 +    @ApiStatus.Internal
-+    public BlockBreakProgressUpdateEvent(@NotNull final Block block, final float progress, @NotNull final Entity entity) {
++    public BlockBreakProgressUpdateEvent(final Block block, final float progress, final Entity entity) {
 +        super(block);
 +        this.progress = progress;
 +        this.entity = entity;
@@ -45,7 +46,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return The progress of the block break
 +     */
 +    public float getProgress() {
-+        return progress;
++        return this.progress;
 +    }
 +
 +    /**
@@ -53,16 +54,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The entity breaking the block
 +     */
-+    @NotNull
 +    public Entity getEntity() {
-+        return entity;
++        return this.entity;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
-+    public static @NotNull HandlerList getHandlerList() {
++
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/Add-BlockFailedDispenseEvent.patch

@@ -15,12 +15,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.block.Block;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
++import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a block tries to dispense an item, but its inventory is empty.
 + */
++@NullMarked
 +public class BlockFailedDispenseEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -28,7 +30,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean shouldPlayEffect = true;
 +
 +    @ApiStatus.Internal
-+    public BlockFailedDispenseEvent(@NotNull Block theBlock) {
++    public BlockFailedDispenseEvent(final Block theBlock) {
 +        super(theBlock);
 +    }
 +
@@ -44,7 +46,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param playEffect if the effect should be played
 +     */
-+    public void shouldPlayEffect(boolean playEffect) {
++    public void shouldPlayEffect(final boolean playEffect) {
 +        this.shouldPlayEffect = playEffect;
 +    }
 +
@@ -58,11 +60,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/Add-BlockLockCheckEvent.patch

@@ -31,6 +31,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +import com.google.common.base.Preconditions;
 +import io.papermc.paper.block.LockableTileState;
++import java.util.Objects;
 +import net.kyori.adventure.sound.Sound;
 +import net.kyori.adventure.text.Component;
 +import org.bukkit.block.Block;
@@ -40,28 +41,27 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.block.BlockEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
-+
-+import java.util.Objects;
 +
 +/**
 + * Called when the server tries to check the lock on a lockable block entity.
 + * <br>
 + * See {@link #setResult(Result)} to change behavior
 + */
++@NullMarked
 +public class BlockLockCheckEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final Player player;
-+    private Component lockedMessage;
++    private @Nullable Component lockedMessage;
-+    private Sound lockedSound;
++    private @Nullable Sound lockedSound;
-+    private ItemStack itemStack;
++    private @Nullable ItemStack itemStack;
 +    private Result result = Result.DEFAULT;
 +
 +    @ApiStatus.Internal
-+    public BlockLockCheckEvent(final @NotNull Block block, final @NotNull Player player, final @NotNull Component lockedMessage, final @NotNull Sound lockedSound) {
++    public BlockLockCheckEvent(final Block block, final Player player, final Component lockedMessage, final Sound lockedSound) {
 +        super(block);
 +        this.player = player;
 +        this.lockedMessage = lockedMessage;
@@ -74,7 +74,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the snapshot block state.
 +     */
-+    public @NotNull LockableTileState getBlockState() {
++    public LockableTileState getBlockState() {
 +        final BlockState blockState = this.getBlock().getState();
 +        Preconditions.checkState(blockState instanceof LockableTileState, "Block state of lock-checked block is no longer a lockable tile state!");
 +        return (LockableTileState) blockState;
@@ -85,7 +85,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the player
 +     */
-+    public @NotNull Player getPlayer() {
++    public Player getPlayer() {
 +        return this.player;
 +    }
 +
@@ -98,7 +98,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return the item being used as the key item
 +     * @see #isUsingCustomKeyItemStack()
 +     */
-+    public @NotNull ItemStack getKeyItem() {
++    public ItemStack getKeyItem() {
 +        return Objects.requireNonNullElseGet(this.itemStack, this.player.getInventory()::getItemInMainHand);
 +    }
 +
@@ -108,7 +108,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param stack the stack to use as a key
 +     * @see #resetKeyItem() to clear a custom key item
 +     */
-+    public void setKeyItem(@NotNull ItemStack stack) {
++    public void setKeyItem(final ItemStack stack) {
 +        Preconditions.checkArgument(stack != null, "stack cannot be null");
 +        this.itemStack = stack;
 +    }
@@ -135,7 +135,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return the result
 +     * @see #setResult(Result)
 +     */
-+    public @NotNull Result getResult() {
++    public Result getResult() {
 +        return this.result;
 +    }
 +
@@ -148,7 +148,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param result the result of this event
 +     */
-+    public void setResult(@NotNull Result result) {
++    public void setResult(final Result result) {
 +        this.result = result;
 +    }
 +
@@ -159,7 +159,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param lockedMessage the message to show if locked (or {@code null} for none)
 +     * @param lockedSound   the sound to play if locked (or {@code null} for none)
 +     */
-+    public void denyWithMessageAndSound(@Nullable Component lockedMessage, @Nullable Sound lockedSound) {
++    public void denyWithMessageAndSound(final @Nullable Component lockedMessage, final @Nullable Sound lockedSound) {
 +        this.result = Result.DENY;
 +        this.lockedMessage = lockedMessage;
 +        this.lockedSound = lockedSound;
@@ -181,7 +181,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param lockedMessage the locked message (or {@code null} for none)
 +     */
-+    public void setLockedMessage(@Nullable Component lockedMessage) {
++    public void setLockedMessage(final @Nullable Component lockedMessage) {
 +        this.lockedMessage = lockedMessage;
 +    }
 +
@@ -201,16 +201,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param lockedSound the locked sound (or {@code null} for none)
 +     */
-+    public void setLockedSound(@Nullable Sound lockedSound) {
++    public void setLockedSound(final @Nullable Sound lockedSound) {
 +        this.lockedSound = lockedSound;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/Add-BlockPreDispenseEvent.patch

@@ -18,8 +18,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.block.BlockEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
++@NullMarked
 +public class BlockPreDispenseEvent extends BlockEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,7 +31,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public BlockPreDispenseEvent(@NotNull Block block, @NotNull ItemStack itemStack, int slot) {
++    public BlockPreDispenseEvent(final Block block, final ItemStack itemStack, final int slot) {
 +        super(block);
 +        this.itemStack = itemStack;
 +        this.slot = slot;
@@ -41,7 +42,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The item to be dispensed
 +     */
-+    @NotNull
 +    public ItemStack getItemStack() {
 +        return this.itemStack;
 +    }
@@ -61,16 +61,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-CompostItemEvent-and-EntityCompostItemEvent.patch

@@ -18,12 +18,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.inventory.InventoryMoveItemEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an item is about to be composted by a hopper.
 + * To prevent hoppers from moving items into composters, cancel the {@link InventoryMoveItemEvent}.
 + */
++@NullMarked
 +public class CompostItemEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -32,7 +33,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean willRaiseLevel;
 +
 +    @ApiStatus.Internal
-+    public CompostItemEvent(@NotNull Block composter, @NotNull ItemStack item, boolean willRaiseLevel) {
++    public CompostItemEvent(final Block composter, final ItemStack item, final boolean willRaiseLevel) {
 +        super(composter);
 +        this.item = item;
 +        this.willRaiseLevel = willRaiseLevel;
@@ -43,7 +44,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the item
 +     */
-+    @NotNull
 +    public ItemStack getItem() {
 +        return this.item;
 +    }
@@ -62,16 +62,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param willRaiseLevel {@code true} if the composter should rise a level
 +     */
-+    public void setWillRaiseLevel(boolean willRaiseLevel) {
++    public void setWillRaiseLevel(final boolean willRaiseLevel) {
 +        this.willRaiseLevel = willRaiseLevel;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -91,18 +90,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an item is about to be composted by an entity.
 + */
++@NullMarked
 +public class EntityCompostItemEvent extends CompostItemEvent implements Cancellable {
 +
 +    private final Entity entity;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityCompostItemEvent(@NotNull Entity entity, @NotNull Block composter, @NotNull ItemStack item, boolean willRaiseLevel) {
++    public EntityCompostItemEvent(final Entity entity, final Block composter, final ItemStack item, final boolean willRaiseLevel) {
 +        super(composter, item, willRaiseLevel);
 +        this.entity = entity;
 +    }
@@ -112,7 +112,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the entity that composted an item.
 +     */
-+    @NotNull
 +    public Entity getEntity() {
 +        return this.entity;
 +    }
@@ -123,7 +122,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +

patches/api/Add-ElderGuardianAppearanceEvent.patch

@@ -18,11 +18,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Is called when an {@link ElderGuardian} appears in front of a {@link Player}.
 + */
++@NullMarked
 +public class ElderGuardianAppearanceEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -31,7 +32,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public ElderGuardianAppearanceEvent(@NotNull ElderGuardian guardian, @NotNull Player affectedPlayer) {
++    public ElderGuardianAppearanceEvent(final ElderGuardian guardian, final Player affectedPlayer) {
 +        super(guardian);
 +        this.affectedPlayer = affectedPlayer;
 +    }
@@ -41,7 +42,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Player affected by the appearance
 +     */
-+    @NotNull
 +    public Player getAffectedPlayer() {
 +        return this.affectedPlayer;
 +    }
@@ -51,7 +51,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The elder guardian
 +     */
-+    @NotNull
 +    public ElderGuardian getEntity() {
 +        return (ElderGuardian) super.getEntity();
 +    }
@@ -62,17 +61,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-EntityDyeEvent-and-CollarColorable-interface.patch

@@ -53,24 +53,25 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an entity is dyed. Currently, this is called for {@link Sheep}
 + * being dyed, and {@link Wolf}/{@link Cat} collars being dyed.
 + */
++@NullMarked
 +public class EntityDyeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    private final Player player;
++    private final @Nullable Player player;
 +    private DyeColor dyeColor;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityDyeEvent(@NotNull Entity entity, @NotNull DyeColor dyeColor, @Nullable Player player) {
++    public EntityDyeEvent(final Entity entity, final DyeColor dyeColor, final @Nullable Player player) {
 +        super(entity);
 +        this.dyeColor = dyeColor;
 +        this.player = player;
@@ -81,7 +82,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the DyeColor the entity is being dyed
 +     */
-+    public @NotNull DyeColor getColor() {
++    public DyeColor getColor() {
 +        return this.dyeColor;
 +    }
 +
@@ -90,7 +91,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param dyeColor the DyeColor the entity will be dyed
 +     */
-+    public void setColor(@NotNull DyeColor dyeColor) {
++    public void setColor(final DyeColor dyeColor) {
 +        this.dyeColor = dyeColor;
 +    }
 +
@@ -109,16 +110,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/Add-EntityFertilizeEggEvent.patch

@@ -21,8 +21,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when two entities mate and the mating process results in a fertilization.
@@ -35,23 +35,24 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * <li>Sniffers producing the {@link Material#SNIFFER_EGG} item, which needs to be placed before it can begin to hatch.</li>
 + * <li>A turtle being marked with "HasEgg" and laying a {@link Material#TURTLE_EGG} later.</li>
 + * </ul>
-+ *
++ * <p>
 + * The event hence only exposes the two parent entities in the fertilization process and cannot provide the child entity, as it will only exist at a later point in time.
 + */
++@NullMarked
 +public class EntityFertilizeEggEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final LivingEntity mother;
 +    private final LivingEntity father;
-+    private final Player breeder;
++    private final @Nullable Player breeder;
-+    private final ItemStack bredWith;
++    private final @Nullable ItemStack bredWith;
 +    private int experience;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityFertilizeEggEvent(@NotNull LivingEntity mother, @NotNull LivingEntity father, @Nullable Player breeder, @Nullable ItemStack bredWith, int experience) {
++    public EntityFertilizeEggEvent(final LivingEntity mother, final LivingEntity father, final @Nullable Player breeder, final @Nullable ItemStack bredWith, final int experience) {
 +        super(mother);
 +        this.mother = mother;
 +        this.father = father;
@@ -60,7 +61,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        this.experience = experience;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
@@ -72,7 +72,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The "mother" entity.
 +     */
-+    @NotNull
 +    public LivingEntity getMother() {
 +        return this.mother;
 +    }
@@ -83,7 +82,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the other parent
 +     */
-+    @NotNull
 +    public LivingEntity getFather() {
 +        return this.father;
 +    }
@@ -94,8 +92,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The Entity who initiated fertilization.
 +     */
-+    @Nullable
++    public @Nullable Player getBreeder() {
-+    public Player getBreeder() {
 +        return this.breeder;
 +    }
 +
@@ -104,8 +101,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return ItemStack used to initiate fertilization.
 +     */
-+    @Nullable
++    public @Nullable ItemStack getBredWith() {
-+    public ItemStack getBredWith() {
 +        return this.bredWith;
 +    }
 +
@@ -124,7 +120,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param experience experience amount
 +     */
-+    public void setExperience(int experience) {
++    public void setExperience(final int experience) {
 +        this.experience = experience;
 +    }
 +
@@ -134,17 +130,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-EntityInsideBlockEvent.patch

@@ -18,7 +18,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an entity enters the hitbox of a block.
@@ -53,6 +53,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + *     <li>Wither rose</li>
 + * </ul>
 + */
++@NullMarked
 +public class EntityInsideBlockEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -61,7 +62,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityInsideBlockEvent(@NotNull Entity entity, @NotNull Block block) {
++    public EntityInsideBlockEvent(final Entity entity, final Block block) {
 +        super(entity);
 +        this.block = block;
 +    }
@@ -71,7 +72,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the block
 +     */
-+    @NotNull
 +    public Block getBlock() {
 +        return this.block;
 +    }
@@ -82,17 +82,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-EntityLoadCrossbowEvent.patch

@@ -19,11 +19,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.inventory.EquipmentSlot;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a LivingEntity loads a crossbow with a projectile.
 + */
++@NullMarked
 +public class EntityLoadCrossbowEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -35,13 +36,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityLoadCrossbowEvent(@NotNull LivingEntity entity, @NotNull ItemStack crossbow, @NotNull EquipmentSlot hand) {
++    public EntityLoadCrossbowEvent(final LivingEntity entity, final ItemStack crossbow, final EquipmentSlot hand) {
 +        super(entity);
 +        this.crossbow = crossbow;
 +        this.hand = hand;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
@@ -52,7 +52,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the crossbow involved in this event
 +     */
-+    @NotNull
 +    public ItemStack getCrossbow() {
 +        return this.crossbow;
 +    }
@@ -62,7 +61,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the hand
 +     */
-+    @NotNull
 +    public EquipmentSlot getHand() {
 +        return this.hand;
 +    }
@@ -77,7 +75,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @param consume should the item be consumed
 +     */
-+    public void setConsumeItem(boolean consume) {
++    public void setConsumeItem(final boolean consume) {
 +        this.consumeItem = consume;
 +    }
 +
@@ -91,17 +89,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * projectile that would be loaded into the crossbow will not be consumed.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-EntityPortalReadyEvent.patch

@@ -21,28 +21,29 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.EntityPortalEvent;
 +import org.bukkit.event.player.PlayerPortalEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an entity is ready to be teleported by a plugin.
-+ * Currently this is only called after the required
++ * Currently, this is only called after the required
 + * ticks have passed for a Nether Portal.
 + * <p>
 + * Cancelling this event resets the entity's readiness
 + * regarding the current portal.
 + */
++@NullMarked
 +public class EntityPortalReadyEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    private final PortalType portalType;
-+    private World targetWorld;
++    private @Nullable World targetWorld;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityPortalReadyEvent(final @NotNull Entity entity, final @Nullable World targetWorld, final @NotNull PortalType portalType) {
++    public EntityPortalReadyEvent(final Entity entity, final @Nullable World targetWorld, final PortalType portalType) {
 +        super(entity);
 +        this.targetWorld = targetWorld;
 +        this.portalType = portalType;
@@ -81,7 +82,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the portal type
 +     */
-+    public @NotNull PortalType getPortalType() {
++    public PortalType getPortalType() {
 +        return this.portalType;
 +    }
 +
@@ -96,11 +97,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public @NotNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NotNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +}

patches/api/Add-EntityTeleportEndGatewayEvent.patch

@@ -17,17 +17,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.entity.Entity;
 +import org.bukkit.event.entity.EntityTeleportEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time an entity attempts to teleport in an end gateway
 + */
++@NullMarked
 +public class EntityTeleportEndGatewayEvent extends EntityTeleportEvent {
 +
-+    @NotNull private final EndGateway gateway;
++    private final EndGateway gateway;
 +
 +    @ApiStatus.Internal
-+    public EntityTeleportEndGatewayEvent(@NotNull Entity entity, @NotNull Location from, @NotNull Location to, @NotNull EndGateway gateway) {
++    public EntityTeleportEndGatewayEvent(final Entity entity, final Location from, final Location to, final EndGateway gateway) {
 +        super(entity, from, to);
 +        this.gateway = gateway;
 +    }
@@ -37,7 +38,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return EndGateway used
 +     */
-+    @NotNull
 +    public EndGateway getGateway() {
 +        return this.gateway;
 +    }

patches/api/Add-EntityZapEvent.patch

@@ -12,28 +12,28 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 @@ -0,0 +0,0 @@
 +package com.destroystokyo.paper.event.entity;
 +
++import java.util.Collections;
 +import org.bukkit.entity.Entity;
 +import org.bukkit.entity.LightningStrike;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityTransformEvent;
-+
-+import java.util.Collections;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when lightning strikes an entity
 + */
++@NullMarked
 +public class EntityZapEvent extends EntityTransformEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final LightningStrike bolt;
++    private final LightningStrike bolt;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityZapEvent(@NotNull final Entity entity, @NotNull final LightningStrike bolt, @NotNull final Entity replacementEntity) {
++    public EntityZapEvent(final Entity entity, final LightningStrike bolt, final Entity replacementEntity) {
 +        super(entity, Collections.singletonList(replacementEntity), TransformReason.LIGHTNING);
 +        this.bolt = bolt;
 +    }
@@ -43,7 +43,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The lightning bolt responsible for this event
 +     */
-+    @NotNull
 +    public LightningStrike getBolt() {
 +        return this.bolt;
 +    }
@@ -53,7 +52,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The entity that will replace the struck entity
 +     */
-+    @NotNull
 +    public Entity getReplacementEntity() {
 +        return super.getTransformedEntity();
 +    }
@@ -64,17 +62,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-GS4-Query-event.patch

@@ -14,17 +14,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +import com.google.common.base.Preconditions;
 +import com.google.common.collect.ImmutableList;
-+import org.bukkit.Server;
-+import org.bukkit.event.Event;
-+import org.bukkit.event.HandlerList;
-+import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
-+
 +import java.net.InetAddress;
 +import java.util.ArrayList;
 +import java.util.Arrays;
 +import java.util.Collection;
 +import java.util.List;
++import org.bukkit.Server;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
++import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
++import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * This event is fired if server is getting queried over GS4 Query protocol.
@@ -33,6 +33,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + *
 + * @author Mark Vainomaa
 + */
++@NullMarked
 +public final class GS4QueryEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -42,7 +43,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private QueryResponse response;
 +
 +    @ApiStatus.Internal
-+    public GS4QueryEvent(@NotNull QueryType queryType, @NotNull InetAddress querierAddress, @NotNull QueryResponse response) {
++    public GS4QueryEvent(final QueryType queryType, final InetAddress querierAddress, final QueryResponse response) {
 +        super(true); // should always be called async
 +        this.queryType = queryType;
 +        this.querierAddress = querierAddress;
@@ -54,7 +55,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return query type
 +     */
-+    @NotNull
 +    public QueryType getQueryType() {
 +        return this.queryType;
 +    }
@@ -64,7 +64,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return querier address
 +     */
-+    @NotNull
 +    public InetAddress getQuerierAddress() {
 +        return this.querierAddress;
 +    }
@@ -74,7 +73,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return query response
 +     */
-+    @NotNull
 +    public QueryResponse getResponse() {
 +        return this.response;
 +    }
@@ -84,17 +82,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param response query response
 +     */
-+    public void setResponse(@NotNull QueryResponse response) {
++    public void setResponse(final QueryResponse response) {
 +        this.response = Preconditions.checkNotNull(response, "response");
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -115,7 +111,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        FULL
 +    }
 +
-+    public final static class QueryResponse {
++    public static final class QueryResponse {
 +
 +        private final String motd;
 +        private final String gameVersion;
@@ -128,7 +124,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        private final String serverVersion;
 +        private final Collection<PluginInformation> plugins;
 +
-+        private QueryResponse(String motd, String gameVersion, String map, int currentPlayers, int maxPlayers, String hostname, int port, Collection<String> players, String serverVersion, Collection<PluginInformation> plugins) {
++        private QueryResponse(final String motd, final String gameVersion, final String map, final int currentPlayers, final int maxPlayers, final String hostname, final int port, final Collection<String> players, final String serverVersion, final Collection<PluginInformation> plugins) {
 +            this.motd = motd;
 +            this.gameVersion = gameVersion;
 +            this.map = map;
@@ -142,21 +138,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        }
 +
 +        /**
-+         * Get motd which will be used to reply to the query. By default it is {@link Server#getMotd()}.
++         * Get motd which will be used to reply to the query. By default, it is {@link Server#getMotd()}.
 +         *
 +         * @return motd
 +         */
-+        @NotNull
 +        public String getMotd() {
 +            return this.motd;
 +        }
 +
 +        /**
-+         * Get game version which will be used to reply to the query. By default supported Minecraft versions range is sent.
++         * Get game version which will be used to reply to the query. By default, supported Minecraft versions range is sent.
 +         *
 +         * @return game version
 +         */
-+        @NotNull
 +        public String getGameVersion() {
 +            return this.gameVersion;
 +        }
@@ -166,7 +160,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return map name
 +         */
-+        @NotNull
 +        public String getMap() {
 +            return this.map;
 +        }
@@ -194,7 +187,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return server hostname
 +         */
-+        @NotNull
 +        public String getHostname() {
 +            return this.hostname;
 +        }
@@ -213,7 +205,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return collection of players
 +         */
-+        @NotNull
 +        public Collection<String> getPlayers() {
 +            return this.players;
 +        }
@@ -223,7 +214,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return server software
 +         */
-+        @NotNull
 +        public String getServerVersion() {
 +            return this.serverVersion;
 +        }
@@ -233,7 +223,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return collection of plugins
 +         */
-+        @NotNull
 +        public Collection<PluginInformation> getPlugins() {
 +            return this.plugins;
 +        }
@@ -243,19 +232,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return {@link QueryResponse} builder
 +         */
-+        @NotNull
 +        public Builder toBuilder() {
 +            return QueryResponse.builder()
-+                .motd(getMotd())
++                .motd(this.getMotd())
-+                .gameVersion(getGameVersion())
++                .gameVersion(this.getGameVersion())
-+                .map(getMap())
++                .map(this.getMap())
-+                .currentPlayers(getCurrentPlayers())
++                .currentPlayers(this.getCurrentPlayers())
-+                .maxPlayers(getMaxPlayers())
++                .maxPlayers(this.getMaxPlayers())
-+                .hostname(getHostname())
++                .hostname(this.getHostname())
-+                .port(getPort())
++                .port(this.getPort())
-+                .players(getPlayers())
++                .players(this.getPlayers())
-+                .serverVersion(getServerVersion())
++                .serverVersion(this.getServerVersion())
-+                .plugins(getPlugins());
++                .plugins(this.getPlugins());
 +        }
 +
 +        /**
@@ -263,7 +251,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return {@link QueryResponse} builder
 +         */
-+        @NotNull
 +        public static Builder builder() {
 +            return new Builder();
 +        }
@@ -272,11 +259,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         * A builder for {@link QueryResponse} objects.
 +         */
 +        public static final class Builder {
-+            private String motd;
++
-+            private String gameVersion;
++            private @MonotonicNonNull String motd;
-+            private String map;
++            private @MonotonicNonNull String gameVersion;
-+            private String hostname;
++            private @MonotonicNonNull String map;
-+            private String serverVersion;
++            private @MonotonicNonNull String hostname;
++            private @MonotonicNonNull String serverVersion;
 +
 +            private int currentPlayers;
 +            private int maxPlayers;
@@ -285,90 +273,77 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +            private final List<String> players = new ArrayList<>();
 +            private final List<PluginInformation> plugins = new ArrayList<>();
 +
-+            private Builder() {}
++            private Builder() {
++            }
 +
-+            @NotNull
++            public Builder motd(final String motd) {
-+            public Builder motd(@NotNull String motd) {
 +                this.motd = Preconditions.checkNotNull(motd, "motd");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder gameVersion(final String gameVersion) {
-+            public Builder gameVersion(@NotNull String gameVersion) {
 +                this.gameVersion = Preconditions.checkNotNull(gameVersion, "gameVersion");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder map(final String map) {
-+            public Builder map(@NotNull String map) {
 +                this.map = Preconditions.checkNotNull(map, "map");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder currentPlayers(final int currentPlayers) {
-+            public Builder currentPlayers(int currentPlayers) {
 +                Preconditions.checkArgument(currentPlayers >= 0, "currentPlayers cannot be negative");
 +                this.currentPlayers = currentPlayers;
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder maxPlayers(final int maxPlayers) {
-+            public Builder maxPlayers(int maxPlayers) {
 +                Preconditions.checkArgument(maxPlayers >= 0, "maxPlayers cannot be negative");
 +                this.maxPlayers = maxPlayers;
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder hostname(final String hostname) {
-+            public Builder hostname(@NotNull String hostname) {
 +                this.hostname = Preconditions.checkNotNull(hostname, "hostname");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder port(final int port) {
-+            public Builder port(int port) {
 +                Preconditions.checkArgument(port >= 1 && port <= 65535, "port must be between 1-65535");
 +                this.port = port;
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder players(final Collection<String> players) {
-+            public Builder players(@NotNull Collection<String> players) {
 +                this.players.addAll(Preconditions.checkNotNull(players, "players"));
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder players(final String... players) {
-+            public Builder players(@NotNull String... players) {
 +                this.players.addAll(Arrays.asList(Preconditions.checkNotNull(players, "players")));
 +                return this;
 +            }
 +
-+            @NotNull
 +            public Builder clearPlayers() {
 +                this.players.clear();
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder serverVersion(final String serverVersion) {
-+            public Builder serverVersion(@NotNull String serverVersion) {
 +                this.serverVersion = Preconditions.checkNotNull(serverVersion, "serverVersion");
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder plugins(final Collection<PluginInformation> plugins) {
-+            public Builder plugins(@NotNull Collection<PluginInformation> plugins) {
 +                this.plugins.addAll(Preconditions.checkNotNull(plugins, "plugins"));
 +                return this;
 +            }
 +
-+            @NotNull
++            public Builder plugins(final PluginInformation... plugins) {
-+            public Builder plugins(@NotNull PluginInformation... plugins) {
 +                this.plugins.addAll(Arrays.asList(Preconditions.checkNotNull(plugins, "plugins")));
 +                return this;
 +            }
 +
-+            @NotNull
 +            public Builder clearPlugins() {
 +                this.plugins.clear();
 +                return this;
@@ -379,19 +354,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +             *
 +             * @return response
 +             */
-+            @NotNull
 +            public QueryResponse build() {
 +                return new QueryResponse(
-+                    Preconditions.checkNotNull(motd, "motd"),
++                    Preconditions.checkNotNull(this.motd, "motd"),
-+                    Preconditions.checkNotNull(gameVersion, "gameVersion"),
++                    Preconditions.checkNotNull(this.gameVersion, "gameVersion"),
-+                    Preconditions.checkNotNull(map, "map"),
++                    Preconditions.checkNotNull(this.map, "map"),
-+                    currentPlayers,
++                    this.currentPlayers,
-+                    maxPlayers,
++                    this.maxPlayers,
-+                    Preconditions.checkNotNull(hostname, "hostname"),
++                    Preconditions.checkNotNull(this.hostname, "hostname"),
-+                    port,
++                    this.port,
-+                    ImmutableList.copyOf(players),
++                    ImmutableList.copyOf(this.players),
-+                    Preconditions.checkNotNull(serverVersion, "serverVersion"),
++                    Preconditions.checkNotNull(this.serverVersion, "serverVersion"),
-+                    ImmutableList.copyOf(plugins)
++                    ImmutableList.copyOf(this.plugins)
 +                );
 +            }
 +        }
@@ -404,31 +378,28 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +            private String name;
 +            private String version;
 +
-+            public PluginInformation(@NotNull String name, @NotNull String version) {
++            public PluginInformation(final String name, final String version) {
 +                this.name = Preconditions.checkNotNull(name, "name");
 +                this.version = Preconditions.checkNotNull(version, "version");
 +            }
 +
-+            @NotNull
 +            public String getName() {
 +                return this.name;
 +            }
 +
-+            public void setName(@NotNull String name) {
++            public void setName(final String name) {
 +                this.name = name;
 +            }
 +
-+            public void setVersion(@NotNull String version) {
++            public void setVersion(final String version) {
 +                this.version = version;
 +            }
 +
-+            @NotNull
 +            public String getVersion() {
 +                return this.version;
 +            }
 +
-+            @NotNull
++            public static PluginInformation of(final String name, final String version) {
-+            public static PluginInformation of(@NotNull String name, @NotNull String version) {
 +                return new PluginInformation(name, version);
 +            }
 +        }

patches/api/Add-More-Creeper-API.patch

@@ -17,13 +17,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a Creeper is ignited either by a
 + * flint and steel, {@link Creeper#ignite()} or
 + * {@link Creeper#setIgnited(boolean)}.
 + */
++@NullMarked
 +public class CreeperIgniteEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -32,12 +33,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public CreeperIgniteEvent(@NotNull Creeper creeper, boolean ignited) {
++    public CreeperIgniteEvent(final Creeper creeper, final boolean ignited) {
 +        super(creeper);
 +        this.ignited = ignited;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Creeper getEntity() {
 +        return (Creeper) super.getEntity();
@@ -47,7 +47,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.ignited;
 +    }
 +
-+    public void setIgnited(boolean ignited) {
++    public void setIgnited(final boolean ignited) {
 +        this.ignited = ignited;
 +    }
 +
@@ -55,17 +55,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.cancelled;
 +    }
 +
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-PhantomPreSpawnEvent.patch

@@ -17,17 +17,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.entity.EntityType;
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a phantom is spawned for an exhausted player
 + */
++@NullMarked
 +public class PhantomPreSpawnEvent extends PreCreatureSpawnEvent {
 +
-+    @NotNull private final Entity entity;
++    private final Entity entity;
 +
 +    @ApiStatus.Internal
-+    public PhantomPreSpawnEvent(@NotNull Location location, @NotNull Entity entity, @NotNull CreatureSpawnEvent.SpawnReason reason) {
++    public PhantomPreSpawnEvent(final Location location, final Entity entity, final CreatureSpawnEvent.SpawnReason reason) {
 +        super(location, EntityType.PHANTOM, reason);
 +        this.entity = entity;
 +    }
@@ -37,7 +38,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the Entity
 +     */
-+    @NotNull
 +    public Entity getSpawningEntity() {
 +        return this.entity;
 +    }

patches/api/Add-PlayerConnectionCloseEvent.patch

@@ -41,15 +41,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 @@ -0,0 +0,0 @@
 +package com.destroystokyo.paper.event.player;
 +
-+import org.bukkit.event.Event;
-+import org.bukkit.event.HandlerList;
-+
 +import java.net.InetAddress;
 +import java.util.UUID;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.AsyncPlayerPreLoginEvent;
 +import org.bukkit.event.player.PlayerQuitEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * <p>
@@ -76,16 +75,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * The event may be invoked asynchronously or synchronously. Plugins should check
 + * {@link Event#isAsynchronous()} and handle accordingly.
 + */
++@NullMarked
 +public class PlayerConnectionCloseEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final UUID playerUniqueId;
++    private final UUID playerUniqueId;
-+    @NotNull private final String playerName;
++    private final String playerName;
-+    @NotNull private final InetAddress ipAddress;
++    private final InetAddress ipAddress;
 +
 +    @ApiStatus.Internal
-+    public PlayerConnectionCloseEvent(@NotNull final UUID playerUniqueId, @NotNull final String playerName, @NotNull final InetAddress ipAddress, final boolean async) {
++    public PlayerConnectionCloseEvent(final UUID playerUniqueId, final String playerName, final InetAddress ipAddress, final boolean async) {
 +        super(async);
 +        this.playerUniqueId = playerUniqueId;
 +        this.playerName = playerName;
@@ -95,7 +95,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * Returns the {@code UUID} of the player disconnecting.
 +     */
-+    @NotNull
 +    public UUID getPlayerUniqueId() {
 +        return this.playerUniqueId;
 +    }
@@ -103,7 +102,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * Returns the name of the player disconnecting.
 +     */
-+    @NotNull
 +    public String getPlayerName() {
 +        return this.playerName;
 +    }
@@ -111,18 +109,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * Returns the player's IP address.
 +     */
-+    @NotNull
 +    public InetAddress getIpAddress() {
 +        return this.ipAddress;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-PlayerShearBlockEvent.patch

@@ -12,6 +12,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 @@ -0,0 +0,0 @@
 +package io.papermc.paper.event.block;
 +
++import java.util.List;
 +import org.bukkit.block.Block;
 +import org.bukkit.entity.Player;
 +import org.bukkit.event.Cancellable;
@@ -20,9 +21,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.inventory.EquipmentSlot;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+
-+import java.util.List;
 +
 +/**
 + * Called when a player uses sheers on a block.
@@ -32,6 +31,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * <p>
 + * Examples include shearing a pumpkin to turn it into a carved pumpkin or shearing a beehive to get honeycomb.
 + */
++@NullMarked
 +public class PlayerShearBlockEvent extends PlayerEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -44,7 +44,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PlayerShearBlockEvent(@NotNull Player player, @NotNull Block block, @NotNull ItemStack item, @NotNull EquipmentSlot hand, @NotNull List<ItemStack> drops) {
++    public PlayerShearBlockEvent(final Player player, final Block block, final ItemStack item, final EquipmentSlot hand, final List<ItemStack> drops) {
 +        super(player);
 +        this.block = block;
 +        this.item = item;
@@ -57,7 +57,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The {@link Block} which block is being sheared in this event.
 +     */
-+    @NotNull
 +    public Block getBlock() {
 +        return this.block;
 +    }
@@ -67,7 +66,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The {@link ItemStack} of the shears.
 +     */
-+    @NotNull
 +    public ItemStack getItem() {
 +        return this.item;
 +    }
@@ -77,7 +75,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Either {@link EquipmentSlot#HAND} OR {@link EquipmentSlot#OFF_HAND}.
 +     */
-+    @NotNull
 +    public EquipmentSlot getHand() {
 +        return this.hand;
 +    }
@@ -85,9 +82,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * Gets the resulting drops of this event.
 +     *
-+     * @return A {@link List list} of {@link ItemStack items} that will be dropped as result of this event.
++     * @return A mutable {@link List list} of {@link ItemStack items} that will be dropped as result of this event.
 +     */
-+    @NotNull
 +    public List<ItemStack> getDrops() {
 +        return this.drops;
 +    }
@@ -108,17 +104,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param cancel whether the shearing of the block should be cancelled or not.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-PrepareResultEvent-PrepareGrindstoneEvent.patch

@@ -58,18 +58,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.inventory.InventoryView;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an item is put in an inventory containing a result slot
 + */
++@NullMarked
 +public class PrepareResultEvent extends PrepareInventoryResultEvent {
 +
 +    // HandlerList on PrepareInventoryResultEvent to ensure api compat
 +
 +    @ApiStatus.Internal
-+    public PrepareResultEvent(@NotNull InventoryView inventory, @Nullable ItemStack result) {
++    public PrepareResultEvent(final InventoryView inventory, final @Nullable ItemStack result) {
 +        super(inventory, result);
 +    }
 +
@@ -78,8 +79,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return result item
 +     */
-+    @Nullable
++    public @Nullable ItemStack getResult() {
-+    public ItemStack getResult() {
 +        return super.getResult();
 +    }
 +
@@ -88,7 +88,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param result result item
 +     */
-+    public void setResult(@Nullable ItemStack result) {
++    public void setResult(final @Nullable ItemStack result) {
 +        super.setResult(result);
 +    }
 +}

patches/api/Add-PufferFishStateChangeEvent.patch

@@ -17,11 +17,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called just before a {@link PufferFish} inflates or deflates.
 + */
++@NullMarked
 +public class PufferFishStateChangeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,12 +31,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PufferFishStateChangeEvent(@NotNull PufferFish entity, int newPuffState) {
++    public PufferFishStateChangeEvent(final PufferFish entity, final int newPuffState) {
 +        super(entity);
 +        this.newPuffState = newPuffState;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public PufferFish getEntity() {
 +        return (PufferFish) super.getEntity();
@@ -77,7 +77,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param cancel {@code true} if you wish to cancel the (in/de)flation
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
@@ -86,13 +86,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.cancelled;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-ShulkerDuplicateEvent.patch

@@ -17,13 +17,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a shulker duplicates itself by spawning a new shulker.
 + * <p>
 + * The event is fired prior to the newly created shulker, accessible via {@link #getEntity()}, being added to the world.
 + */
++@NullMarked
 +public class ShulkerDuplicateEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -32,7 +33,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public ShulkerDuplicateEvent(@NotNull Shulker child, @NotNull Shulker parent) {
++    public ShulkerDuplicateEvent(final Shulker child, final Shulker parent) {
 +        super(child);
 +        this.parent = parent;
 +    }
@@ -44,7 +45,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return the newly duplicated shulker.
 +     */
 +    @Override
-+    @NotNull
 +    public Shulker getEntity() {
 +        return (Shulker) super.getEntity();
 +    }
@@ -55,7 +55,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the previously existing shulker which duplicated.
 +     */
-+    @NotNull
 +    public Shulker getParent() {
 +        return this.parent;
 +    }
@@ -66,17 +65,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-TameableDeathMessageEvent.patch

@@ -18,11 +18,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a {@link Tameable} dies and sends a death message.
 + */
++@NullMarked
 +public class TameableDeathMessageEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -31,7 +32,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TameableDeathMessageEvent(@NotNull Tameable tameable, @NotNull Component deathMessage) {
++    public TameableDeathMessageEvent(final Tameable tameable, final Component deathMessage) {
 +        super(tameable);
 +        this.deathMessage = deathMessage;
 +    }
@@ -41,7 +42,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param deathMessage Death message to appear
 +     */
-+    public void deathMessage(@NotNull Component deathMessage) {
++    public void deathMessage(final Component deathMessage) {
 +        this.deathMessage = deathMessage;
 +    }
 +
@@ -50,12 +51,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Death message to appear
 +     */
-+    @NotNull
 +    public Component deathMessage() {
 +        return this.deathMessage;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Tameable getEntity() {
 +        return (Tameable) super.getEntity();
@@ -67,17 +66,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-TargetHitEvent-API.patch

@@ -19,8 +19,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.ProjectileHitEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
 +import org.jetbrains.annotations.Range;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a Target Block is hit by a projectile.
@@ -29,6 +29,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * and in the case that the shooter is a player, will stop them from receiving
 + * advancement criteria.
 + */
++@NullMarked
 +public class TargetHitEvent extends ProjectileHitEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -36,7 +37,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private int signalStrength;
 +
 +    @ApiStatus.Internal
-+    public TargetHitEvent(@NotNull Projectile projectile, @NotNull Block block, @NotNull BlockFace blockFace, int signalStrength) {
++    public TargetHitEvent(final Projectile projectile, final Block block, final BlockFace blockFace, final int signalStrength) {
 +        super(projectile, null, block, blockFace);
 +        this.signalStrength = signalStrength;
 +    }
@@ -55,18 +56,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param signalStrength the strength of the redstone signal to be emitted
 +     */
-+    public void setSignalStrength(@Range(from = 0, to = 15) int signalStrength) {
++    public void setSignalStrength(final @Range(from = 0, to = 15) int signalStrength) {
 +        Preconditions.checkArgument(signalStrength >= 0 && signalStrength <= 15, "Signal strength out of range (%s), must be in range [0,15]", signalStrength);
 +        this.signalStrength = signalStrength;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-ThrownEggHatchEvent.patch

@@ -20,13 +20,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a thrown egg might hatch.
 + * <p>
 + * This event fires for all thrown eggs that may hatch, players, dispensers, etc.
 + */
++@NullMarked
 +public class ThrownEggHatchEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -37,7 +38,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private EntityType hatchType;
 +
 +    @ApiStatus.Internal
-+    public ThrownEggHatchEvent(@NotNull final Egg egg, final boolean hatching, final byte numHatches, @NotNull final EntityType hatchingType) {
++    public ThrownEggHatchEvent(final Egg egg, final boolean hatching, final byte numHatches, final EntityType hatchingType) {
 +        this.egg = egg;
 +        this.hatching = hatching;
 +        this.numHatches = numHatches;
@@ -49,7 +50,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the egg involved in this event
 +     */
-+    @NotNull
 +    public Egg getEgg() {
 +        return this.egg;
 +    }
@@ -70,7 +70,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param hatching {@code true} if you want the egg to hatch, {@code false} if you want it
 +     *                 not to
 +     */
-+    public void setHatching(boolean hatching) {
++    public void setHatching(final boolean hatching) {
 +        this.hatching = hatching;
 +    }
 +
@@ -79,7 +79,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The type of the mob being hatched by the egg
 +     */
-+    @NotNull
 +    public EntityType getHatchingType() {
 +        return this.hatchType;
 +    }
@@ -89,13 +88,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param hatchType The type of the mob being hatched by the egg
 +     */
-+    public void setHatchingType(@NotNull EntityType hatchType) {
++    public void setHatchingType(final EntityType hatchType) {
 +        Preconditions.checkArgument(hatchType.isSpawnable(), "Can't spawn that entity type from an egg!");
 +        this.hatchType = hatchType;
 +    }
 +
 +    /**
-+     * Get the number of mob hatches from the egg. By default the number will
++     * Get the number of mob hatches from the egg. By default, the number will
 +     * be the number the server would've done
 +     * <ul>
 +     *  <li>7/8 chance of being 0
@@ -117,17 +116,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param numHatches The number of mobs coming out of the egg
 +     */
-+    public void setNumHatches(byte numHatches) {
++    public void setNumHatches(final byte numHatches) {
 +        this.numHatches = numHatches;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-WardenAngerChangeEvent.patch

@@ -21,14 +21,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
 +import org.jetbrains.annotations.Range;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a Warden's anger level has changed due to another entity.
 + * <p>
 + * If the event is cancelled, the warden's anger level will not change.
 + */
++@NullMarked
 +public class WardenAngerChangeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -40,7 +41,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WardenAngerChangeEvent(@NotNull final Warden warden, @NotNull final Entity target, final int oldAnger, final int newAnger) {
++    public WardenAngerChangeEvent(final Warden warden, final Entity target, final int oldAnger, final int newAnger) {
 +        super(warden);
 +        this.target = target;
 +        this.oldAnger = oldAnger;
@@ -52,7 +53,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return triggering entity
 +     */
-+    @NotNull
 +    public Entity getTarget() {
 +        return this.target;
 +    }
@@ -63,8 +63,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return old anger level
 +     * @see Warden#getAnger(Entity)
 +     */
-+    @Range(from = 0, to = 150)
++    public @Range(from = 0, to = 150) int getOldAnger() {
-+    public int getOldAnger() {
 +        return this.oldAnger;
 +    }
 +
@@ -74,8 +73,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return new anger level
 +     * @see Warden#getAnger(Entity)
 +     */
-+    @Range(from = 0, to = 150)
++    public @Range(from = 0, to = 150) int getNewAnger() {
-+    public int getNewAnger() {
 +        return this.newAnger;
 +    }
 +
@@ -85,15 +83,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * The anger of a warden is capped at 150.
 +     *
 +     * @param newAnger the new anger level, max 150
-+     * @see Warden#setAnger(Entity, int)
 +     * @throws IllegalArgumentException if newAnger is greater than 150
++     * @see Warden#setAnger(Entity, int)
 +     */
-+    public void setNewAnger(@Range(from = 0, to = 150) int newAnger) {
++    public void setNewAnger(final @Range(from = 0, to = 150) int newAnger) {
 +        Preconditions.checkArgument(newAnger <= 150, "newAnger must not be greater than 150");
 +        this.newAnger = newAnger;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Warden getEntity() {
 +        return (Warden) super.getEntity();
@@ -105,17 +102,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-WaterBottleSplashEvent.patch

@@ -23,28 +23,29 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.entity.ThrownPotion;
 +import org.bukkit.event.entity.PotionSplashEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
-+import org.jetbrains.annotations.Nullable;
 +import org.jetbrains.annotations.Unmodifiable;
++import org.jspecify.annotations.NullMarked;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when a splash water potion "splashes" and affects
 + * different entities in different ways.
 + */
++@NullMarked
 +public class WaterBottleSplashEvent extends PotionSplashEvent {
 +
-+    private final @NotNull Set<LivingEntity> rehydrate;
++    private final Set<LivingEntity> rehydrate;
-+    private final @NotNull Set<LivingEntity> extinguish;
++    private final Set<LivingEntity> extinguish;
 +
 +    @ApiStatus.Internal
 +    public WaterBottleSplashEvent(
-+        final @NotNull ThrownPotion potion,
++        final ThrownPotion potion,
 +        final @Nullable Entity hitEntity,
 +        final @Nullable Block hitBlock,
 +        final @Nullable BlockFace hitFace,
-+        final @NotNull Map<LivingEntity, Double> affectedEntities,
++        final Map<LivingEntity, Double> affectedEntities,
-+        final @NotNull Set<LivingEntity> rehydrate,
++        final Set<LivingEntity> rehydrate,
-+        final @NotNull Set<LivingEntity> extinguish
++        final Set<LivingEntity> extinguish
 +    ) {
 +        super(potion, hitEntity, hitBlock, hitFace, affectedEntities);
 +        this.rehydrate = rehydrate;
@@ -61,7 +62,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @see #doNotDamageAsWaterSensitive(LivingEntity)
 +     * @see #damageAsWaterSensitive(LivingEntity)
 +     */
-+    @NotNull
 +    public @Unmodifiable Collection<LivingEntity> getToDamage() {
 +        return this.affectedEntities.entrySet().stream().filter(entry -> entry.getValue() > 0).map(Map.Entry::getKey).collect(Collectors.toUnmodifiableSet());
 +    }
@@ -72,7 +72,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param entity entity to remove
 +     */
-+    public void doNotDamageAsWaterSensitive(final @NotNull LivingEntity entity) {
++    public void doNotDamageAsWaterSensitive(final LivingEntity entity) {
 +        this.affectedEntities.remove(entity);
 +    }
 +
@@ -82,7 +82,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param entity entity to add
 +     */
-+    public void damageAsWaterSensitive(final @NotNull LivingEntity entity) {
++    public void damageAsWaterSensitive(final LivingEntity entity) {
 +        this.affectedEntities.put(entity, 1.0);
 +    }
 +
@@ -96,7 +96,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the entities
 +     */
-+    @NotNull
 +    public Collection<LivingEntity> getToRehydrate() {
 +        return this.rehydrate;
 +    }
@@ -107,7 +106,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return entities to be extinguished
 +     */
-+    @NotNull
 +    public Collection<LivingEntity> getToExtinguish() {
 +        return this.extinguish;
 +    }
@@ -118,7 +116,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     */
 +    @Deprecated(since = "1.19.3")
 +    @Override
-+    public @NotNull Collection<LivingEntity> getAffectedEntities() {
++    public Collection<LivingEntity> getAffectedEntities() {
 +        return super.getAffectedEntities();
 +    }
 +
@@ -130,7 +128,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     */
 +    @Deprecated(since = "1.19.3")
 +    @Override
-+    public double getIntensity(final @NotNull LivingEntity entity) {
++    public double getIntensity(final LivingEntity entity) {
 +        return super.getIntensity(entity);
 +    }
 +
@@ -143,7 +141,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     */
 +    @Deprecated(since = "1.19.3")
 +    @Override
-+    public void setIntensity(final @NotNull LivingEntity entity, final double intensity) {
++    public void setIntensity(final LivingEntity entity, final double intensity) {
 +        super.setIntensity(entity, intensity);
 +    }
 +}

patches/api/Add-WhitelistToggleEvent.patch

@@ -15,13 +15,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * This event is fired when whitelist is toggled
 + *
 + * @author Mark Vainomaa
 + */
++@NullMarked
 +public class WhitelistToggleEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -29,7 +30,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final boolean enabled;
 +
 +    @ApiStatus.Internal
-+    public WhitelistToggleEvent(boolean enabled) {
++    public WhitelistToggleEvent(final boolean enabled) {
 +        this.enabled = enabled;
 +    }
 +
@@ -42,13 +43,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.enabled;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-entity-knockback-events.patch

@@ -23,19 +23,20 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.entity.Entity;
 +import org.bukkit.entity.LivingEntity;
 +import org.bukkit.util.Vector;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an Entity is knocked back by the hit of another Entity. The acceleration
 + * vector can be modified. If this event is cancelled, the entity is not knocked back.
 + */
++@NullMarked
 +public class EntityKnockbackByEntityEvent extends EntityPushedByEntityAttackEvent {
 +
 +    private final float knockbackStrength;
 +
 +    @ApiStatus.Internal
-+    public EntityKnockbackByEntityEvent(final @NonNull LivingEntity entity, final @NonNull Entity hitBy, final EntityKnockbackEvent.@NonNull Cause cause, final float knockbackStrength, final @NonNull Vector knockback) {
++    public EntityKnockbackByEntityEvent(final LivingEntity entity, final Entity hitBy, final EntityKnockbackEvent.Cause cause, final float knockbackStrength, final Vector knockback) {
 +        super(entity, cause, hitBy, knockback);
 +        this.knockbackStrength = knockbackStrength;
 +    }
@@ -44,7 +45,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return the entity which was knocked back
 +     */
 +    @Override
-+    public @NonNull LivingEntity getEntity() {
++    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
 +    }
 +
@@ -62,7 +63,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the Entity which hit
 +     */
-+    public @NonNull Entity getHitBy() {
++    public Entity getHitBy() {
 +        return super.getPushedBy();
 +    }
 +
@@ -81,14 +82,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.util.Vector;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an entity receives knockback.
 + * @see EntityPushedByEntityAttackEvent
 + * @see com.destroystokyo.paper.event.entity.EntityKnockbackByEntityEvent
 + */
++@NullMarked
 +public class EntityKnockbackEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -98,7 +100,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityKnockbackEvent(final @NonNull Entity entity, final EntityKnockbackEvent.@NonNull Cause cause, final @NonNull Vector knockback) {
++    public EntityKnockbackEvent(final Entity entity, final EntityKnockbackEvent.Cause cause, final Vector knockback) {
 +        super(entity);
 +        this.cause = cause;
 +        this.knockback = knockback;
@@ -109,7 +111,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the cause of the knockback
 +     */
-+    public EntityKnockbackEvent.@NonNull Cause getCause() {
++    public EntityKnockbackEvent.Cause getCause() {
 +        return this.cause;
 +    }
 +
@@ -121,7 +123,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the knockback
 +     */
-+    public @NonNull Vector getKnockback() {
++    public Vector getKnockback() {
 +        return this.knockback.clone();
 +    }
 +
@@ -130,7 +132,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param knockback the knockback
 +     */
-+    public void setKnockback(final @NonNull Vector knockback) {
++    public void setKnockback(final Vector knockback) {
 +        Preconditions.checkArgument(knockback != null, "knockback");
 +        this.knockback = knockback.clone();
 +    }
@@ -146,11 +148,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public @NonNull HandlerList getHandlers() {
++    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    public static @NonNull HandlerList getHandlerList() {
++    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +
@@ -200,8 +202,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.entity.Entity;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.util.Vector;
-+import org.checkerframework.checker.nullness.qual.NonNull;
 +import org.jetbrains.annotations.ApiStatus;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an entity is pushed by another entity's attack. The acceleration vector can be
@@ -210,12 +212,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * Note: Some entities might trigger this multiple times on the same entity
 + * as multiple acceleration calculations are done.
 + */
++@NullMarked
 +public class EntityPushedByEntityAttackEvent extends EntityKnockbackEvent implements Cancellable {
 +
 +    private final Entity pushedBy;
 +
 +    @ApiStatus.Internal
-+    public EntityPushedByEntityAttackEvent(final @NonNull Entity entity, final EntityKnockbackEvent.@NonNull Cause cause, final @NonNull Entity pushedBy, final @NonNull Vector knockback) {
++    public EntityPushedByEntityAttackEvent(final Entity entity, final EntityKnockbackEvent.Cause cause, final Entity pushedBy, final Vector knockback) {
 +        super(entity, cause, knockback);
 +        this.pushedBy = pushedBy;
 +    }
@@ -225,7 +228,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the pushing entity
 +     */
-+    public @NonNull Entity getPushedBy() {
++    public Entity getPushedBy() {
 +        return this.pushedBy;
 +    }
 +
@@ -236,7 +239,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @deprecated use {@link #getKnockback()}
 +     */
 +    @Deprecated(since = "1.20.6", forRemoval = true)
-+    public @NonNull Vector getAcceleration() {
++    public Vector getAcceleration() {
 +        return this.knockback; // TODO Clone in 1.21 to not instantly break what was technically already modifiable (call super.getKnockback())
 +    }
 +
@@ -247,7 +250,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @deprecated use {@link #setKnockback(Vector)}
 +     */
 +    @Deprecated(since = "1.20.6", forRemoval = true)
-+    public void setAcceleration(final @NonNull Vector acceleration) {
++    public void setAcceleration(final Vector acceleration) {
 +        super.setKnockback(acceleration);
 +    }
 +

patches/api/Add-handshake-event-to-allow-plugins-to-handle-clien.patch

@@ -14,6 +14,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +package com.destroystokyo.paper.event.player;
 +
 +import com.google.common.base.Preconditions;
++import java.util.UUID;
 +import net.kyori.adventure.text.Component;
 +import net.kyori.adventure.text.format.NamedTextColor;
 +import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
@@ -21,10 +22,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
-+
-+import java.util.UUID;
 +
 +/**
 + * This event is fired during a player handshake.
@@ -34,16 +33,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + *
 + * <p>WARNING: TAMPERING WITH THIS EVENT CAN BE DANGEROUS</p>
 + */
++@NullMarked
 +public class PlayerHandshakeEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final String originalHandshake;
++    private final String originalHandshake;
-+    @NotNull private final String originalSocketAddressHostname;
++    private final String originalSocketAddressHostname;
-+    @Nullable private String serverHostname;
++    private @Nullable String serverHostname;
-+    @Nullable private String socketAddressHostname;
++    private @Nullable String socketAddressHostname;
-+    @Nullable private UUID uniqueId;
++    private @Nullable UUID uniqueId;
-+    @Nullable private String propertiesJson;
++    private @Nullable String propertiesJson;
 +    private boolean failed;
 +    private Component failMessage = Component.text("If you wish to use IP forwarding, please enable it in your BungeeCord config as well!", NamedTextColor.YELLOW);
 +
@@ -51,12 +51,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    @Deprecated
 +    @ApiStatus.Internal
-+    public PlayerHandshakeEvent(@NotNull String originalHandshake, boolean cancelled) {
++    public PlayerHandshakeEvent(final String originalHandshake, final boolean cancelled) {
 +        this(originalHandshake, "127.0.0.1", cancelled);
 +    }
 +
 +    @ApiStatus.Internal
-+    public PlayerHandshakeEvent(@NotNull String originalHandshake, @NotNull String originalSocketAddressHostname, boolean cancelled) {
++    public PlayerHandshakeEvent(final String originalHandshake, final String originalSocketAddressHostname, final boolean cancelled) {
 +        super(true);
 +        this.originalHandshake = originalHandshake;
 +        this.originalSocketAddressHostname = originalSocketAddressHostname;
@@ -85,7 +85,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param cancel {@code true} if this event is cancelled, {@code false} otherwise
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
@@ -94,7 +94,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the original handshake string
 +     */
-+    @NotNull
 +    public String getOriginalHandshake() {
 +        return this.originalHandshake;
 +    }
@@ -107,7 +106,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the original socket address hostname
 +     */
-+    @NotNull
 +    public String getOriginalSocketAddressHostname() {
 +        return this.originalSocketAddressHostname;
 +    }
@@ -119,8 +117,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the server hostname string
 +     */
-+    @Nullable
++    public @Nullable String getServerHostname() {
-+    public String getServerHostname() {
 +        return this.serverHostname;
 +    }
 +
@@ -131,7 +128,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param serverHostname the server hostname string
 +     */
-+    public void setServerHostname(@NotNull String serverHostname) {
++    public void setServerHostname(final String serverHostname) {
 +        this.serverHostname = serverHostname;
 +    }
 +
@@ -142,8 +139,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the socket address hostname string
 +     */
-+    @Nullable
++    public @Nullable String getSocketAddressHostname() {
-+    public String getSocketAddressHostname() {
 +        return this.socketAddressHostname;
 +    }
 +
@@ -154,7 +150,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param socketAddressHostname the socket address hostname string
 +     */
-+    public void setSocketAddressHostname(@NotNull String socketAddressHostname) {
++    public void setSocketAddressHostname(final String socketAddressHostname) {
 +        this.socketAddressHostname = socketAddressHostname;
 +    }
 +
@@ -163,8 +159,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the unique id
 +     */
-+    @Nullable
++    public @Nullable UUID getUniqueId() {
-+    public UUID getUniqueId() {
 +        return this.uniqueId;
 +    }
 +
@@ -173,7 +168,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param uniqueId the unique id
 +     */
-+    public void setUniqueId(@NotNull UUID uniqueId) {
++    public void setUniqueId(final UUID uniqueId) {
 +        this.uniqueId = uniqueId;
 +    }
 +
@@ -184,8 +179,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the profile properties, as JSON
 +     */
-+    @Nullable
++    public @Nullable String getPropertiesJson() {
-+    public String getPropertiesJson() {
 +        return this.propertiesJson;
 +    }
 +
@@ -209,7 +203,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param failed {@code true} if authentication failed, {@code false} otherwise
 +     */
-+    public void setFailed(boolean failed) {
++    public void setFailed(final boolean failed) {
 +        this.failed = failed;
 +    }
 +
@@ -220,7 +214,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param propertiesJson the profile properties, as JSON
 +     */
-+    public void setPropertiesJson(@NotNull String propertiesJson) {
++    public void setPropertiesJson(final String propertiesJson) {
 +        this.propertiesJson = propertiesJson;
 +    }
 +
@@ -229,7 +223,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the message to display to the client
 +     */
-+    @NotNull
 +    public Component failMessage() {
 +        return this.failMessage;
 +    }
@@ -239,7 +232,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param failMessage the message to display to the client
 +     */
-+    public void failMessage(@NotNull Component failMessage) {
++    public void failMessage(final Component failMessage) {
 +        this.failMessage = failMessage;
 +    }
 +
@@ -249,7 +242,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return the message to display to the client
 +     * @deprecated use {@link #failMessage()}
 +     */
-+    @NotNull
 +    @Deprecated
 +    public String getFailMessage() {
 +        return LegacyComponentSerializer.legacySection().serialize(this.failMessage());
@@ -262,18 +254,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @deprecated use {@link #failMessage(Component)}
 +     */
 +    @Deprecated
-+    public void setFailMessage(@NotNull String failMessage) {
++    public void setFailMessage(final String failMessage) {
 +        Preconditions.checkArgument(failMessage != null && !failMessage.isEmpty(), "fail message cannot be null or empty");
 +        this.failMessage(LegacyComponentSerializer.legacySection().deserialize(failMessage));
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Add-whitelist-events.patch

@@ -19,22 +19,23 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * This event gets called when the whitelist status of a player is changed
 + */
++@NullMarked
 +public class WhitelistStateUpdateEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final PlayerProfile playerProfile;
++    private final PlayerProfile playerProfile;
-+    @NotNull private final WhitelistStatus status;
++    private final WhitelistStatus status;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WhitelistStateUpdateEvent(@NotNull PlayerProfile playerProfile, @NotNull WhitelistStatus status) {
++    public WhitelistStateUpdateEvent(final PlayerProfile playerProfile, final WhitelistStatus status) {
 +        this.playerProfile = playerProfile;
 +        this.status = status;
 +    }
@@ -44,7 +45,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the player whose status is being changed
 +     */
-+    @NotNull
 +    public OfflinePlayer getPlayer() {
 +        return Bukkit.getOfflinePlayer(this.playerProfile.getId());
 +    }
@@ -54,7 +54,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the player profile whose status is being changed
 +     */
-+    @NotNull
 +    public PlayerProfile getPlayerProfile() {
 +        return this.playerProfile;
 +    }
@@ -64,7 +63,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the whitelist status
 +     */
-+    @NotNull
 +    public WhitelistStatus getStatus() {
 +        return this.status;
 +    }
@@ -75,17 +73,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Added-EntityDamageItemEvent.patch

@@ -18,7 +18,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an item on or used by an entity takes durability damage as a result of being hit/used.
@@ -26,6 +26,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * NOTE: default vanilla behaviour dictates that armor/tools picked up by
 + * mobs do not take damage (except via Thorns).
 + */
++@NullMarked
 +public class EntityDamageItemEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -36,7 +37,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityDamageItemEvent(@NotNull Entity entity, @NotNull ItemStack item, int damage) {
++    public EntityDamageItemEvent(final Entity entity, final ItemStack item, final int damage) {
 +        super(entity);
 +        this.item = item;
 +        this.damage = damage;
@@ -47,7 +48,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the item
 +     */
-+    @NotNull
 +    public ItemStack getItem() {
 +        return this.item;
 +    }
@@ -66,7 +66,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param damage the damage amount to cause
 +     */
-+    public void setDamage(int damage) {
++    public void setDamage(final int damage) {
 +        this.damage = damage;
 +    }
 +
@@ -76,17 +76,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Added-EntityToggleSitEvent.patch

@@ -17,11 +17,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Is called when an entity sits down or stands up.
 + */
++@NullMarked
 +public class EntityToggleSitEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,7 +31,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityToggleSitEvent(@NotNull Entity entity, boolean isSitting) {
++    public EntityToggleSitEvent(final Entity entity, final boolean isSitting) {
 +        super(entity);
 +        this.isSitting = isSitting;
 +    }
@@ -50,17 +51,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Added-ServerResourcesReloadedEvent.patch

@@ -15,13 +15,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.server.ServerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when resources such as datapacks are reloaded (e.g. /minecraft:reload)
 + * <p>
 + * Intended for use to re-register custom recipes, advancements that may be lost during a reload like this.
 + */
++@NullMarked
 +public class ServerResourcesReloadedEvent extends ServerEvent {
 +
 +    public static final HandlerList HANDLER_LIST = new HandlerList();
@@ -29,7 +30,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final Cause cause;
 +
 +    @ApiStatus.Internal
-+    public ServerResourcesReloadedEvent(@NotNull Cause cause) {
++    public ServerResourcesReloadedEvent(final Cause cause) {
 +        this.cause = cause;
 +    }
 +
@@ -38,17 +39,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the reload cause
 +     */
-+    @NotNull
 +    public Cause getCause() {
 +        return this.cause;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;

patches/api/AnvilDamageEvent.patch

@@ -20,12 +20,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.inventory.AnvilInventory;
 +import org.bukkit.inventory.InventoryView;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when an anvil is damaged from being used
 + */
++@NullMarked
 +public class AnvilDamagedEvent extends InventoryEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -34,12 +35,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public AnvilDamagedEvent(@NotNull InventoryView inventory, @Nullable BlockData blockData) {
++    public AnvilDamagedEvent(final InventoryView inventory, final @Nullable BlockData blockData) {
 +        super(inventory);
 +        this.damageState = DamageState.getState(blockData);
 +    }
 +
-+    @NotNull
 +    @Override
 +    public AnvilInventory getInventory() {
 +        return (AnvilInventory) super.getInventory();
@@ -50,7 +50,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Damage state
 +     */
-+    @NotNull
 +    public DamageState getDamageState() {
 +        return this.damageState;
 +    }
@@ -60,7 +59,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param damageState Damage state
 +     */
-+    public void setDamageState(@NotNull DamageState damageState) {
++    public void setDamageState(final DamageState damageState) {
 +        this.damageState = damageState;
 +    }
 +
@@ -78,7 +77,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param breaking {@code true} if breaking
 +     */
-+    public void setBreaking(boolean breaking) {
++    public void setBreaking(final boolean breaking) {
 +        if (breaking) {
 +            this.damageState = DamageState.BROKEN;
 +        } else if (this.damageState == DamageState.BROKEN) {
@@ -92,16 +91,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -117,7 +114,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +        private final Material material;
 +
-+        DamageState(@NotNull Material material) {
++        DamageState(final Material material) {
 +            this.material = material;
 +        }
 +
@@ -126,7 +123,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return Material
 +         */
-+        @NotNull
 +        public Material getMaterial() {
 +            return this.material;
 +        }
@@ -138,8 +134,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         * @return DamageState
 +         * @throws IllegalArgumentException If non anvil block data is given
 +         */
-+        @NotNull
++        public static DamageState getState(final @Nullable BlockData blockData) {
-+        public static DamageState getState(@Nullable BlockData blockData) {
 +            return blockData == null ? BROKEN : getState(blockData.getMaterial());
 +        }
 +
@@ -150,12 +145,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         * @return DamageState
 +         * @throws IllegalArgumentException If non anvil material is given
 +         */
-+        @NotNull
++        public static DamageState getState(final @Nullable Material material) {
-+        public static DamageState getState(@Nullable Material material) {
 +            if (material == null) {
 +                return BROKEN;
 +            }
-+            for (DamageState state : values()) {
++            for (final DamageState state : values()) {
 +                if (state.getMaterial() == material) {
 +                    return state;
 +                }

patches/api/AsyncTabCompleteEvent.patch

@@ -48,6 +48,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +import com.google.common.base.Preconditions;
 +import io.papermc.paper.util.TransformingRandomAccessList;
++import java.util.ArrayList;
++import java.util.List;
++import java.util.Objects;
++import java.util.stream.Stream;
 +import net.kyori.adventure.text.Component;
 +import net.kyori.examination.Examinable;
 +import net.kyori.examination.ExaminableProperty;
@@ -58,14 +62,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
-+
-+import java.util.ArrayList;
-+import java.util.List;
-+import java.util.Objects;
-+import java.util.stream.Stream;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Allows plugins to compute tab completion results asynchronously.
@@ -76,15 +75,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * <p>
 + * Only 1 process will be allowed to provide completions, the Async Event, or the standard process.
 + */
++@NullMarked
 +public class AsyncTabCompleteEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final CommandSender sender;
++    private final CommandSender sender;
-+    @NotNull private final String buffer;
++    private final String buffer;
 +    private final boolean isCommand;
-+    @Nullable
++    private final @Nullable Location location;
-+    private final Location location;
 +    private final List<Completion> completions = new ArrayList<>();
 +    private final List<String> stringCompletions = new TransformingRandomAccessList<>(
 +        this.completions,
@@ -95,7 +94,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public AsyncTabCompleteEvent(@NotNull CommandSender sender, @NotNull String buffer, boolean isCommand, @Nullable Location loc) {
++    public AsyncTabCompleteEvent(final CommandSender sender, final String buffer, final boolean isCommand, final @Nullable Location loc) {
 +        super(true);
 +        this.sender = sender;
 +        this.buffer = buffer;
@@ -105,7 +104,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    @Deprecated
 +    @ApiStatus.Internal
-+    public AsyncTabCompleteEvent(@NotNull CommandSender sender, @NotNull List<String> completions, @NotNull String buffer, boolean isCommand, @Nullable Location loc) {
++    public AsyncTabCompleteEvent(final CommandSender sender, final List<String> completions, final String buffer, final boolean isCommand, final @Nullable Location loc) {
 +        super(true);
 +        this.sender = sender;
 +        this.completions.addAll(fromStrings(completions));
@@ -119,7 +118,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the {@link CommandSender} instance
 +     */
-+    @NotNull
 +    public CommandSender getSender() {
 +        return this.sender;
 +    }
@@ -134,7 +132,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return a list of offered completions
 +     */
-+    @NotNull
 +    public List<String> getCompletions() {
 +        return this.stringCompletions;
 +    }
@@ -149,7 +146,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param completions the new completions
 +     */
-+    public void setCompletions(@NotNull List<String> completions) {
++    public void setCompletions(final List<String> completions) {
 +        Preconditions.checkArgument(completions != null, "Completions list cannot be null");
 +        if (completions == this.stringCompletions) {
 +            return;
@@ -168,7 +165,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return a list of offered completions
 +     */
-+    public @NotNull List<Completion> completions() {
++    public List<Completion> completions() {
 +        return this.completions;
 +    }
 +
@@ -182,7 +179,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param newCompletions the new completions
 +     */
-+    public void completions(final @NotNull List<Completion> newCompletions) {
++    public void completions(final List<Completion> newCompletions) {
 +        Preconditions.checkArgument(newCompletions != null, "new completions cannot be null");
 +        this.completions.clear();
 +        this.completions.addAll(newCompletions);
@@ -193,7 +190,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return command buffer, as entered
 +     */
-+    @NotNull
 +    public String getBuffer() {
 +        return this.buffer;
 +    }
@@ -208,8 +204,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The position looked at by the sender, or {@code null} if none
 +     */
-+    @Nullable
++    public @Nullable Location getLocation() {
-+    public Location getLocation() {
 +        return this.location != null ? this.location.clone() : null;
 +    }
 +
@@ -230,7 +225,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param handled if this completion should be marked as being handled
 +     */
-+    public void setHandled(boolean handled) {
++    public void setHandled(final boolean handled) {
 +        this.handled = handled;
 +    }
 +
@@ -245,21 +240,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * Will provide no completions, and will not fire the synchronous process
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
 +
-+    private static @NotNull List<Completion> fromStrings(final @NotNull List<String> suggestions) {
++    private static List<Completion> fromStrings(final List<String> suggestions) {
 +        final List<Completion> list = new ArrayList<>(suggestions.size());
 +        for (final String suggestion : suggestions) {
 +            list.add(new CompletionImpl(suggestion, null));
@@ -277,7 +270,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         *
 +         * @return suggestion string
 +         */
-+        @NotNull String suggestion();
++        String suggestion();
 +
 +        /**
 +         * Get the suggestion tooltip for this {@link Completion}.
@@ -287,7 +280,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        @Nullable Component tooltip();
 +
 +        @Override
-+        default @NotNull Stream<? extends ExaminableProperty> examinableProperties() {
++        default Stream<? extends ExaminableProperty> examinableProperties() {
 +            return Stream.of(ExaminableProperty.of("suggestion", this.suggestion()), ExaminableProperty.of("tooltip", this.tooltip()));
 +        }
 +
@@ -297,7 +290,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         * @param suggestion suggestion string
 +         * @return new completion instance
 +         */
-+        static @NotNull Completion completion(final @NotNull String suggestion) {
++        static Completion completion(final String suggestion) {
 +            return new CompletionImpl(suggestion, null);
 +        }
 +
@@ -310,7 +303,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +         * @param tooltip    tooltip component, or {@code null}
 +         * @return new completion instance
 +         */
-+        static @NotNull Completion completion(final @NotNull String suggestion, final @Nullable Component tooltip) {
++        static Completion completion(final String suggestion, final @Nullable Component tooltip) {
 +            return new CompletionImpl(suggestion, tooltip);
 +        }
 +    }
@@ -319,15 +312,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    static final class CompletionImpl implements Completion {
 +
 +        private final String suggestion;
-+        private final Component tooltip;
++        private final @Nullable Component tooltip;
 +
-+        CompletionImpl(final @NotNull String suggestion, final @Nullable Component tooltip) {
++        CompletionImpl(final String suggestion, final @Nullable Component tooltip) {
 +            this.suggestion = suggestion;
 +            this.tooltip = tooltip;
 +        }
 +
 +        @Override
-+        public @NotNull String suggestion() {
++        public String suggestion() {
 +            return this.suggestion;
 +        }
 +
@@ -355,7 +348,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        }
 +
 +        @Override
-+        public @NotNull String toString() {
++        public String toString() {
 +            return StringExaminer.simpleEscaping().examine(this);
 +        }
 +    }

patches/api/BlockDestroyEvent.patch

@@ -24,7 +24,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockExpEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired anytime the server intends to 'destroy' a block through some triggering reason.
@@ -36,11 +36,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * <p>
 + * Events such as leaves decaying, pistons retracting (where the block is moving), does NOT fire this event.
 + */
++@NullMarked
 +public class BlockDestroyEvent extends BlockExpEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final BlockData newState;
++    private final BlockData newState;
 +    private boolean willDrop;
 +    private boolean playEffect = true;
 +    private BlockData effectBlock;
@@ -48,7 +49,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public BlockDestroyEvent(@NotNull Block block, @NotNull BlockData newState, @NotNull BlockData effectBlock, int xp, boolean willDrop) {
++    public BlockDestroyEvent(final Block block, final BlockData newState, final BlockData effectBlock, final int xp, final boolean willDrop) {
 +        super(block, xp);
 +        this.newState = newState;
 +        this.effectBlock = effectBlock;
@@ -60,7 +61,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return block break effect
 +     */
-+    @NotNull
 +    public BlockData getEffectBlock() {
 +        return this.effectBlock;
 +    }
@@ -72,14 +72,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param effectBlock block effect
 +     */
-+    public void setEffectBlock(@NotNull BlockData effectBlock) {
++    public void setEffectBlock(final BlockData effectBlock) {
 +        this.effectBlock = effectBlock;
 +    }
 +
 +    /**
 +     * @return The new state of this block (Air, or a Fluid type)
 +     */
-+    public @NotNull BlockData getNewState() {
++    public BlockData getNewState() {
 +        return this.newState.clone();
 +    }
 +
@@ -93,7 +93,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @param willDrop If the server is going to drop the block in question with this destroy event
 +     */
-+    public void setWillDrop(boolean willDrop) {
++    public void setWillDrop(final boolean willDrop) {
 +        this.willDrop = willDrop;
 +    }
 +
@@ -107,7 +107,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @param playEffect If the server should play the sound effect for this destruction
 +     */
-+    public void setPlayEffect(boolean playEffect) {
++    public void setPlayEffect(final boolean playEffect) {
 +        this.playEffect = playEffect;
 +    }
 +
@@ -123,17 +123,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * If the event is cancelled, the block will remain in its previous state.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Brigadier-based-command-API.patch

@@ -115,7 +115,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.PlayerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time a Brigadier RootCommandNode is generated for a player to inform the client of commands.
@@ -138,6 +138,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * <p>This is a draft/experimental API and is subject to change.</p>
 + */
 +@ApiStatus.Experimental
++@NullMarked
 +public class AsyncPlayerSendCommandsEvent<S extends CommandSourceStack> extends PlayerEvent {
 +
 +    private static final HandlerList handlers = new HandlerList();
@@ -145,7 +146,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final boolean hasFiredAsync;
 +
 +    @ApiStatus.Internal
-+    public AsyncPlayerSendCommandsEvent(@NotNull Player player, @NotNull RootCommandNode<S> node, boolean hasFiredAsync) {
++    public AsyncPlayerSendCommandsEvent(final Player player, final RootCommandNode<S> node, final boolean hasFiredAsync) {
 +        super(player, !Bukkit.isPrimaryThread());
 +        this.node = node;
 +        this.hasFiredAsync = hasFiredAsync;
@@ -156,8 +157,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the root command node
 +     */
-+    public @NotNull RootCommandNode<S> getCommandNode() {
++    public RootCommandNode<S> getCommandNode() {
-+        return node;
++        return this.node;
 +    }
 +
 +    /**
@@ -166,15 +167,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return whether this event has already fired asynchronously
 +     */
 +    public boolean hasFiredAsync() {
-+        return hasFiredAsync;
++        return this.hasFiredAsync;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return handlers;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return handlers;
 +    }
@@ -194,13 +193,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.PlayerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when sending {@link Suggestions} to the client. Will be called asynchronously if a plugin
 + * marks the {@link com.destroystokyo.paper.event.server.AsyncTabCompleteEvent} event handled asynchronously,
 + * otherwise called synchronously.
 + */
++@NullMarked
 +public class AsyncPlayerSendSuggestionsEvent extends PlayerEvent implements Cancellable {
 +
 +    private static final HandlerList handlers = new HandlerList();
@@ -210,7 +210,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final String buffer;
 +
 +    @ApiStatus.Internal
-+    public AsyncPlayerSendSuggestionsEvent(@NotNull Player player, @NotNull Suggestions suggestions, @NotNull String buffer) {
++    public AsyncPlayerSendSuggestionsEvent(final Player player, final Suggestions suggestions, final String buffer) {
 +        super(player, !Bukkit.isPrimaryThread());
 +        this.suggestions = suggestions;
 +        this.buffer = buffer;
@@ -221,8 +221,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the input buffer
 +     */
-+    public @NotNull String getBuffer() {
++    public String getBuffer() {
-+        return buffer;
++        return this.buffer;
 +    }
 +
 +    /**
@@ -230,8 +230,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the suggestions
 +     */
-+    public @NotNull Suggestions getSuggestions() {
++    public Suggestions getSuggestions() {
-+        return suggestions;
++        return this.suggestions;
 +    }
 +
 +    /**
@@ -239,7 +239,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param suggestions suggestions
 +     */
-+    public void setSuggestions(@NotNull Suggestions suggestions) {
++    public void setSuggestions(final Suggestions suggestions) {
 +        this.suggestions = suggestions;
 +    }
 +
@@ -256,16 +256,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * {@inheritDoc}
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return handlers;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return handlers;
 +    }

patches/api/Build-system-changes.patch

@@ -32,6 +32,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    compileOnlyApi(checkerQual)
 +    testCompileOnly(checkerQual)
 +    // Paper end
++    api("org.jspecify:jspecify:1.0.0") // Paper - add jspecify
 +
      testImplementation("org.apache.commons:commons-lang3:3.12.0")
      testImplementation("org.junit.jupiter:junit-jupiter:5.10.2")

patches/api/EnderDragon-Events.patch

@@ -12,30 +12,30 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 @@ -0,0 +0,0 @@
 +package com.destroystokyo.paper.event.entity;
 +
++import java.util.Collection;
 +import org.bukkit.entity.AreaEffectCloud;
 +import org.bukkit.entity.DragonFireball;
 +import org.bukkit.entity.LivingEntity;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
-+
-+import java.util.Collection;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a DragonFireball collides with a block/entity and spawns an AreaEffectCloud
 + */
++@NullMarked
 +public class EnderDragonFireballHitEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Collection<LivingEntity> targets;
++    private final Collection<LivingEntity> targets;
-+    @NotNull private final AreaEffectCloud areaEffectCloud;
++    private final AreaEffectCloud areaEffectCloud;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EnderDragonFireballHitEvent(@NotNull DragonFireball fireball, @NotNull Collection<LivingEntity> targets, @NotNull AreaEffectCloud areaEffectCloud) {
++    public EnderDragonFireballHitEvent(final DragonFireball fireball, final Collection<LivingEntity> targets, final AreaEffectCloud areaEffectCloud) {
 +        super(fireball);
 +        this.targets = targets;
 +        this.areaEffectCloud = areaEffectCloud;
@@ -44,7 +44,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * The fireball involved in this event
 +     */
-+    @NotNull
 +    @Override
 +    public DragonFireball getEntity() {
 +        return (DragonFireball) super.getEntity();
@@ -55,7 +54,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the targets
 +     */
-+    @NotNull
 +    public Collection<LivingEntity> getTargets() {
 +        return this.targets;
 +    }
@@ -63,7 +61,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The area effect cloud spawned in this collision
 +     */
-+    @NotNull
 +    public AreaEffectCloud getAreaEffectCloud() {
 +        return this.areaEffectCloud;
 +    }
@@ -74,17 +71,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -103,20 +98,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an EnderDragon spawns an AreaEffectCloud by shooting flames
 + */
++@NullMarked
 +public class EnderDragonFlameEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final AreaEffectCloud areaEffectCloud;
++    private final AreaEffectCloud areaEffectCloud;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EnderDragonFlameEvent(@NotNull EnderDragon enderDragon, @NotNull AreaEffectCloud areaEffectCloud) {
++    public EnderDragonFlameEvent(final EnderDragon enderDragon, final AreaEffectCloud areaEffectCloud) {
 +        super(enderDragon);
 +        this.areaEffectCloud = areaEffectCloud;
 +    }
@@ -124,7 +120,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * The enderdragon involved in this event
 +     */
-+    @NotNull
 +    @Override
 +    public EnderDragon getEntity() {
 +        return (EnderDragon) super.getEntity();
@@ -133,7 +128,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The area effect cloud spawned in this collision
 +     */
-+    @NotNull
 +    public AreaEffectCloud getAreaEffectCloud() {
 +        return this.areaEffectCloud;
 +    }
@@ -144,16 +138,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -172,20 +164,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an EnderDragon shoots a fireball
 + */
++@NullMarked
 +public class EnderDragonShootFireballEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final DragonFireball fireball;
++    private final DragonFireball fireball;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EnderDragonShootFireballEvent(@NotNull EnderDragon entity, @NotNull DragonFireball fireball) {
++    public EnderDragonShootFireballEvent(final EnderDragon entity, final DragonFireball fireball) {
 +        super(entity);
 +        this.fireball = fireball;
 +    }
@@ -193,7 +186,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * The enderdragon shooting the fireball
 +     */
-+    @NotNull
 +    @Override
 +    public EnderDragon getEntity() {
 +        return (EnderDragon) super.getEntity();
@@ -202,7 +194,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The fireball being shot
 +     */
-+    @NotNull
 +    public DragonFireball getFireball() {
 +        return this.fireball;
 +    }
@@ -213,17 +204,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/EndermanAttackPlayerEvent.patch

@@ -44,7 +44,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when an Enderman determines if it should attack a player or not.
@@ -52,15 +52,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * Starts off cancelled if the player is wearing a pumpkin head or is not looking
 + * at the Enderman, according to Vanilla rules.
 + */
++@NullMarked
 +public class EndermanAttackPlayerEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Player player;
++    private final Player player;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EndermanAttackPlayerEvent(@NotNull Enderman entity, @NotNull Player player) {
++    public EndermanAttackPlayerEvent(final Enderman entity, final Player player) {
 +        super(entity);
 +        this.player = player;
 +    }
@@ -70,7 +71,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The enderman considering attacking
 +     */
-+    @NotNull
 +    @Override
 +    public Enderman getEntity() {
 +        return (Enderman) super.getEntity();
@@ -81,7 +81,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The player the Enderman is considering attacking
 +     */
-+    @NotNull
 +    public Player getPlayer() {
 +        return this.player;
 +    }
@@ -100,16 +99,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * Cancels if the Enderman will attack this player
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/EndermanEscapeEvent.patch

@@ -20,22 +20,22 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
++@NullMarked
 +public class EndermanEscapeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Reason reason;
++    private final Reason reason;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EndermanEscapeEvent(@NotNull Enderman entity, @NotNull Reason reason) {
++    public EndermanEscapeEvent(final Enderman entity, final Reason reason) {
 +        super(entity);
 +        this.reason = reason;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Enderman getEntity() {
 +        return (Enderman) super.getEntity();
@@ -44,7 +44,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The reason the enderman is trying to escape
 +     */
-+    @NotNull
 +    public Reason getReason() {
 +        return this.reason;
 +    }
@@ -57,21 +56,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * Cancels the escape.
 +     * <p>
-+     * If this escape normally would of resulted in damage avoidance such as indirect,
++     * If this escape normally had resulted in damage avoidance such as indirect,
 +     * the enderman will now take damage.
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Entity-AddTo-RemoveFrom-World-Events.patch

@@ -18,21 +18,22 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time an entity is being added to the world for any reason (including a chunk loading).
 + * <p>
 + * Not to be confused with {@link CreatureSpawnEvent}
 + */
++@NullMarked
 +public class EntityAddToWorldEvent extends EntityEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final World world;
++    private final World world;
 +
 +    @ApiStatus.Internal
-+    public EntityAddToWorldEvent(@NotNull Entity entity, @NotNull World world) {
++    public EntityAddToWorldEvent(final Entity entity, final World world) {
 +        super(entity);
 +        this.world = world;
 +    }
@@ -40,17 +41,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The world that the entity is being added to
 +     */
-+    @NotNull
 +    public World getWorld() {
 +        return this.world;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -68,20 +66,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired any time an entity is being removed from a world for any reason (including a chunk unloading).
 + * Note: The entity is updated prior to this event being called, as such, the entity's world may not be equal to {@link #getWorld()}.
 + */
++@NullMarked
 +public class EntityRemoveFromWorldEvent extends EntityEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final World world;
++    private final World world;
 +
 +    @ApiStatus.Internal
-+    public EntityRemoveFromWorldEvent(@NotNull Entity entity, @NotNull World world) {
++    public EntityRemoveFromWorldEvent(final Entity entity, final World world) {
 +        super(entity);
 +        this.world = world;
 +    }
@@ -89,17 +88,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The world that the entity is being removed from
 +     */
-+    @NotNull
 +    public World getWorld() {
 +        return this.world;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Entity-Jump-API.patch

@@ -17,13 +17,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when an entity jumps
 + * <p>
 + * Cancelling the event will stop the entity from jumping
 + */
++@NullMarked
 +public class EntityJumpEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -31,11 +32,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityJumpEvent(@NotNull LivingEntity entity) {
++    public EntityJumpEvent(final LivingEntity entity) {
 +        super(entity);
 +    }
 +
-+    @NotNull
 +    @Override
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
@@ -45,17 +45,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.cancelled;
 +    }
 +
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/EntityMoveEvent.patch

@@ -20,13 +20,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.event.player.PlayerMoveEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Holds information for living entity movement events
 + * <p>
 + * Does not fire for players; use {@link PlayerMoveEvent} for player movement.
 + */
++@NullMarked
 +public class EntityMoveEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -37,14 +38,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityMoveEvent(@NotNull LivingEntity entity, @NotNull Location from, @NotNull Location to) {
++    public EntityMoveEvent(final LivingEntity entity, final Location from, final Location to) {
 +        super(entity);
 +        this.from = from;
 +        this.to = to;
 +    }
 +
 +    @Override
-+    @NotNull
 +    public LivingEntity getEntity() {
 +        return (LivingEntity) super.getEntity();
 +    }
@@ -54,7 +54,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Location the entity moved from
 +     */
-+    @NotNull
 +    public Location getFrom() {
 +        return this.from;
 +    }
@@ -64,8 +63,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param from New location to mark as the entity's previous location
 +     */
-+    public void setFrom(@NotNull Location from) {
++    public void setFrom(final Location from) {
-+        validateLocation(from);
++        this.validateLocation(from);
 +        this.from = from;
 +    }
 +
@@ -74,7 +73,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Location the entity moved to
 +     */
-+    @NotNull
 +    public Location getTo() {
 +        return this.to;
 +    }
@@ -84,8 +82,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param to New Location this entity will move to
 +     */
-+    public void setTo(@NotNull Location to) {
++    public void setTo(final Location to) {
-+        validateLocation(to);
++        this.validateLocation(to);
 +        this.to = to;
 +    }
 +
@@ -95,7 +93,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return whether the entity has changed position or not
 +     */
 +    public boolean hasChangedPosition() {
-+        return hasExplicitlyChangedPosition() || !this.from.getWorld().equals(this.to.getWorld());
++        return this.hasExplicitlyChangedPosition() || !this.from.getWorld().equals(this.to.getWorld());
 +    }
 +
 +    /**
@@ -113,7 +111,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return whether the entity has moved to a new block or not
 +     */
 +    public boolean hasChangedBlock() {
-+        return hasExplicitlyChangedBlock() || !from.getWorld().equals(to.getWorld());
++        return this.hasExplicitlyChangedBlock() || !this.from.getWorld().equals(this.to.getWorld());
 +    }
 +
 +    /**
@@ -134,7 +132,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.from.getPitch() != this.to.getPitch() || this.from.getYaw() != this.to.getYaw();
 +    }
 +
-+    private void validateLocation(@NotNull Location loc) {
++    private void validateLocation(final Location loc) {
 +        Preconditions.checkArgument(loc != null, "Cannot use null location!");
 +        Preconditions.checkArgument(loc.getWorld() != null, "Cannot use null location with null world!");
 +    }
@@ -145,17 +143,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
 +    @Override
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/EntityPathfindEvent.patch

@@ -19,8 +19,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Fired when an Entity decides to start moving towards a location.
@@ -28,16 +28,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * This event does not fire for the entities actual movement. Only when it
 + * is choosing to start moving to a location.
 + */
++@NullMarked
 +public class EntityPathfindEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @Nullable private final Entity targetEntity;
++    private final @Nullable Entity targetEntity;
-+    @NotNull private final Location location;
++    private final Location location;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public EntityPathfindEvent(@NotNull Entity entity, @NotNull Location location, @Nullable Entity targetEntity) {
++    public EntityPathfindEvent(final Entity entity, final Location location, final @Nullable Entity targetEntity) {
 +        super(entity);
 +        this.targetEntity = targetEntity;
 +        this.location = location;
@@ -48,7 +49,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The Entity that is pathfinding.
 +     */
-+    @NotNull
 +    public Entity getEntity() {
 +        return this.entity;
 +    }
@@ -56,12 +56,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * If the Entity is trying to pathfind to an entity, this is the entity in relation.
 +     * <br>
-+     * Otherwise this will return {@code null}.
++     * Otherwise, this will return {@code null}.
 +     *
 +     * @return The entity target or {@code null}
 +     */
-+    @Nullable
++    public @Nullable Entity getTargetEntity() {
-+    public Entity getTargetEntity() {
 +        return this.targetEntity;
 +    }
 +
@@ -72,7 +71,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Location of where the entity is trying to pathfind to.
 +     */
-+    @NotNull
 +    public Location getLoc() {
 +        return this.location.clone();
 +    }
@@ -83,17 +81,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/ExperienceOrb-merging-stacking-API.patch

@@ -46,22 +46,23 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired anytime the server is about to merge 2 experience orbs into one
 + */
++@NullMarked
 +public class ExperienceOrbMergeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final ExperienceOrb mergeTarget;
++    private final ExperienceOrb mergeTarget;
-+    @NotNull private final ExperienceOrb mergeSource;
++    private final ExperienceOrb mergeSource;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public ExperienceOrbMergeEvent(@NotNull ExperienceOrb mergeTarget, @NotNull ExperienceOrb mergeSource) {
++    public ExperienceOrbMergeEvent(final ExperienceOrb mergeTarget, final ExperienceOrb mergeSource) {
 +        super(mergeTarget);
 +        this.mergeTarget = mergeTarget;
 +        this.mergeSource = mergeSource;
@@ -70,7 +71,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The orb that will absorb the other experience orb
 +     */
-+    @NotNull
 +    public ExperienceOrb getMergeTarget() {
 +        return this.mergeTarget;
 +    }
@@ -78,7 +78,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The orb that is subject to being removed and merged into the target orb
 +     */
-+    @NotNull
 +    public ExperienceOrb getMergeSource() {
 +        return this.mergeSource;
 +    }
@@ -92,17 +91,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param cancel {@code true} if you wish to cancel this event, and prevent the orbs from merging
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Introduce-beacon-activation-deactivation-events.patch

@@ -17,18 +17,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when a beacon is activated.
 + * Activation occurs when the beacon beam becomes visible.
 + */
++@NullMarked
 +public class BeaconActivatedEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    @ApiStatus.Internal
-+    public BeaconActivatedEvent(@NotNull Block block) {
++    public BeaconActivatedEvent(final Block block) {
 +        super(block);
 +    }
 +
@@ -37,18 +38,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the beacon that was activated.
 +     */
-+    @NotNull
 +    public Beacon getBeacon() {
 +        return (Beacon) this.block.getState();
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -67,18 +65,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Called when a beacon is deactivated, either because its base block(s) or itself were destroyed.
 + */
++@NullMarked
 +public class BeaconDeactivatedEvent extends BlockEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
 +    @ApiStatus.Internal
-+    public BeaconDeactivatedEvent(@NotNull Block block) {
++    public BeaconDeactivatedEvent(final Block block) {
 +        super(block);
 +    }
 +
@@ -89,18 +88,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The beacon that got deactivated, or {@code null} if it does not exist.
 +     */
-+    @Nullable
++    public @Nullable Beacon getBeacon() {
-+    public Beacon getBeacon() {
 +        return this.block.getType() == Material.BEACON ? (Beacon) this.block.getState() : null;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/PlayerNaturallySpawnCreaturesEvent.patch

@@ -21,11 +21,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.player.PlayerEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when the server is calculating what chunks to try to spawn monsters in every Monster Spawn Tick event
 + */
++@NullMarked
 +public class PlayerNaturallySpawnCreaturesEvent extends PlayerEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -34,7 +35,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PlayerNaturallySpawnCreaturesEvent(@NotNull Player player, byte radius) {
++    public PlayerNaturallySpawnCreaturesEvent(final Player player, final byte radius) {
 +        super(player);
 +        this.radius = radius;
 +    }
@@ -49,12 +50,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @param radius The radius of chunks around this player to be included in natural spawn selection
 +     */
-+    public void setSpawnRadius(byte radius) {
++    public void setSpawnRadius(final byte radius) {
 +        this.radius = radius;
 +    }
 +
 +    /**
-+     * @return If this players chunks will be excluded from natural spawns
++     * @return If this player's chunks will be excluded from natural spawns
 +     */
 +    @Override
 +    public boolean isCancelled() {
@@ -62,20 +63,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    /**
-+     * @param cancel {@code true} if you wish to cancel this event, and not include this players chunks for natural spawning
++     * @param cancel {@code true} if you wish to cancel this event, and not include this player's chunks for natural spawning
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/PreCreatureSpawnEvent.patch

@@ -29,7 +29,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * WARNING: This event only fires for a limited number of cases, and not for every case that {@link CreatureSpawnEvent} does.
@@ -41,19 +41,20 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * Currently: NATURAL and SPAWNER based reasons. <!-- Please submit a Pull Request for future additions. -->
 + * Also, Plugins that replace Entity Registrations with their own custom entities might not fire this event.
 + */
++@NullMarked
 +public class PreCreatureSpawnEvent extends Event implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Location location;
++    private final Location location;
-+    @NotNull private final EntityType type;
++    private final EntityType type;
-+    @NotNull private final CreatureSpawnEvent.SpawnReason reason;
++    private final CreatureSpawnEvent.SpawnReason reason;
 +    private boolean shouldAbortSpawn;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public PreCreatureSpawnEvent(@NotNull Location location, @NotNull EntityType type, @NotNull CreatureSpawnEvent.SpawnReason reason) {
++    public PreCreatureSpawnEvent(final Location location, final EntityType type, final CreatureSpawnEvent.SpawnReason reason) {
 +        this.location = location;
 +        this.type = type;
 +        this.reason = reason;
@@ -62,7 +63,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The location this creature is being spawned at
 +     */
-+    @NotNull
 +    public Location getSpawnLocation() {
 +        return this.location.clone();
 +    }
@@ -70,7 +70,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The type of creature being spawned
 +     */
-+    @NotNull
 +    public EntityType getType() {
 +        return this.type;
 +    }
@@ -78,7 +77,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return Reason this creature is spawning (ie, NATURAL vs SPAWNER)
 +     */
-+    @NotNull
 +    public CreatureSpawnEvent.SpawnReason getReason() {
 +        return this.reason;
 +    }
@@ -96,7 +94,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param shouldAbortSpawn Set if the spawn process should be aborted vs trying more attempts
 +     */
-+    public void setShouldAbortSpawn(boolean shouldAbortSpawn) {
++    public void setShouldAbortSpawn(final boolean shouldAbortSpawn) {
 +        this.shouldAbortSpawn = shouldAbortSpawn;
 +    }
 +
@@ -114,17 +112,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @param cancel {@code true} if you wish to cancel this event, and abort the spawn of this creature
 +     */
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/PreSpawnerSpawnEvent.patch

@@ -22,7 +22,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.entity.EntityType;
 +import org.bukkit.event.entity.CreatureSpawnEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called before an entity is spawned into a world by a spawner.
@@ -30,17 +30,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * This only includes the spawner's location and not the full BlockState snapshot for performance reasons.
 + * If you really need it you have to get the spawner yourself.
 + */
++@NullMarked
 +public class PreSpawnerSpawnEvent extends PreCreatureSpawnEvent {
 +
-+    @NotNull private final Location spawnerLocation;
++    private final Location spawnerLocation;
 +
 +    @ApiStatus.Internal
-+    public PreSpawnerSpawnEvent(@NotNull Location location, @NotNull EntityType type, @NotNull Location spawnerLocation) {
++    public PreSpawnerSpawnEvent(final Location location, final EntityType type, final Location spawnerLocation) {
 +        super(location, type, CreatureSpawnEvent.SpawnReason.SPAWNER);
 +        this.spawnerLocation = spawnerLocation;
 +    }
 +
-+    @NotNull
 +    public Location getSpawnerLocation() {
 +        return this.spawnerLocation.clone();
 +    }

patches/api/Profile-Lookup-Events.patch

@@ -18,9 +18,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.Bukkit;
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
-+
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Allows a plugin to be notified anytime AFTER a Profile has been looked up from the Mojang API
@@ -29,14 +28,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * No guarantees are made about thread execution context for this event. If you need to know, check
 + * {@link Event#isAsynchronous()}
 + */
++@NullMarked
 +public class LookupProfileEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final PlayerProfile profile;
++    private final PlayerProfile profile;
 +
 +    @ApiStatus.Internal
-+    public LookupProfileEvent(@NotNull PlayerProfile profile) {
++    public LookupProfileEvent(final PlayerProfile profile) {
 +        super(!Bukkit.isPrimaryThread());
 +        this.profile = profile;
 +    }
@@ -44,18 +44,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The profile that was recently looked up. This profile can be mutated
 +     */
-+    @NotNull
 +    public PlayerProfile getPlayerProfile() {
 +        return this.profile;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -69,16 +66,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +package com.destroystokyo.paper.event.profile;
 +
 +import com.destroystokyo.paper.profile.ProfileProperty;
-+import org.bukkit.Bukkit;
-+import org.bukkit.event.Event;
-+import org.bukkit.event.HandlerList;
-+
 +import java.util.HashSet;
 +import java.util.Set;
 +import java.util.UUID;
++import org.bukkit.Bukkit;
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Allows a plugin to intercept a Profile Lookup for a Profile by name
@@ -90,17 +86,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * No guarantees are made about thread execution context for this event. If you need to know, check
 + * {@link Event#isAsynchronous()}
 + */
++@NullMarked
 +public class PreLookupProfileEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final String name;
++    private final String name;
 +
-+    private UUID uuid;
++    private @Nullable UUID uuid;
-+    @NotNull private Set<ProfileProperty> properties = new HashSet<>();
++    private Set<ProfileProperty> properties = new HashSet<>();
 +
 +    @ApiStatus.Internal
-+    public PreLookupProfileEvent(@NotNull String name) {
++    public PreLookupProfileEvent(final String name) {
 +        super(!Bukkit.isPrimaryThread());
 +        this.name = name;
 +    }
@@ -108,7 +105,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return Name of the profile
 +     */
-+    @NotNull
 +    public String getName() {
 +        return this.name;
 +    }
@@ -120,8 +116,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The UUID of the profile if it has already been provided by a plugin
 +     */
-+    @Nullable
++    public @Nullable UUID getUUID() {
-+    public UUID getUUID() {
 +        return this.uuid;
 +    }
 +
@@ -132,7 +127,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param uuid the UUID to set for the profile or {@code null} to reset
 +     */
-+    public void setUUID(@Nullable UUID uuid) {
++    public void setUUID(final @Nullable UUID uuid) {
 +        this.uuid = uuid;
 +    }
 +
@@ -140,7 +135,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @return The currently pending pre-populated properties.
 +     * Any property in this Set will be automatically prefilled on this Profile
 +     */
-+    @NotNull
 +    public Set<ProfileProperty> getProfileProperties() {
 +        return this.properties;
 +    }
@@ -151,7 +145,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param properties The properties to add
 +     */
-+    public void setProfileProperties(@NotNull Set<ProfileProperty> properties) {
++    public void setProfileProperties(final Set<ProfileProperty> properties) {
 +        this.properties = new HashSet<>();
 +        this.properties.addAll(properties);
 +    }
@@ -162,17 +156,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param properties The properties to add
 +     */
-+    public void addProfileProperties(@NotNull Set<ProfileProperty> properties) {
++    public void addProfileProperties(final Set<ProfileProperty> properties) {
 +        this.properties.addAll(properties);
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Server-Tick-Events.patch

@@ -16,11 +16,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when the server has finished ticking the main loop
 + */
++@NullMarked
 +public class ServerTickEndEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -30,7 +31,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final long timeEnd;
 +
 +    @ApiStatus.Internal
-+    public ServerTickEndEvent(int tickNumber, double tickDuration, long timeRemaining) {
++    public ServerTickEndEvent(final int tickNumber, final double tickDuration, final long timeRemaining) {
 +        this.tickNumber = tickNumber;
 +        this.tickDuration = tickDuration;
 +        this.timeEnd = System.nanoTime() + timeRemaining;
@@ -63,12 +64,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.timeEnd - System.nanoTime();
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -84,8 +83,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.Event;
 +import org.bukkit.event.HandlerList;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
++@NullMarked
 +public class ServerTickStartEvent extends Event {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -93,7 +93,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final int tickNumber;
 +
 +    @ApiStatus.Internal
-+    public ServerTickStartEvent(int tickNumber) {
++    public ServerTickStartEvent(final int tickNumber) {
 +        this.tickNumber = tickNumber;
 +    }
 +
@@ -104,12 +104,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return this.tickNumber;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/SkeletonHorse-Additions.patch

@@ -13,19 +13,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +package com.destroystokyo.paper.event.entity;
 +
 +import com.google.common.collect.ImmutableList;
++import java.util.List;
 +import org.bukkit.entity.HumanEntity;
 +import org.bukkit.entity.SkeletonHorse;
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+
-+import java.util.List;
 +
 +/**
 + * Event called when a player gets close to a skeleton horse and triggers the lightning trap
 + */
++@NullMarked
 +public class SkeletonHorseTrapEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -35,23 +35,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    @Deprecated
 +    @ApiStatus.Internal
-+    public SkeletonHorseTrapEvent(@NotNull SkeletonHorse horse) {
++    public SkeletonHorseTrapEvent(final SkeletonHorse horse) {
 +        this(horse, ImmutableList.of());
 +    }
 +
 +    @ApiStatus.Internal
-+    public SkeletonHorseTrapEvent(@NotNull SkeletonHorse horse, @NotNull List<HumanEntity> eligibleHumans) {
++    public SkeletonHorseTrapEvent(final SkeletonHorse horse, final List<HumanEntity> eligibleHumans) {
 +        super(horse);
 +        this.eligibleHumans = eligibleHumans;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public SkeletonHorse getEntity() {
 +        return (SkeletonHorse) super.getEntity();
 +    }
 +
-+    @NotNull
 +    public List<HumanEntity> getEligibleHumans() {
 +        return this.eligibleHumans;
 +    }
@@ -62,17 +60,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/Slime-Pathfinder-Events.patch

@@ -14,7 +14,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to change its facing direction.
@@ -22,12 +22,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to change direction.
 + */
++@NullMarked
 +public class SlimeChangeDirectionEvent extends SlimePathfindEvent {
 +
 +    private float yaw;
 +
 +    @ApiStatus.Internal
-+    public SlimeChangeDirectionEvent(@NotNull Slime slime, float yaw) {
++    public SlimeChangeDirectionEvent(final Slime slime, final float yaw) {
 +        super(slime);
 +        this.yaw = yaw;
 +    }
@@ -46,7 +47,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param yaw Chosen yaw
 +     */
-+    public void setNewYaw(float yaw) {
++    public void setNewYaw(final float yaw) {
 +        this.yaw = yaw;
 +    }
 +}
@@ -63,7 +64,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to start pathfinding.
@@ -71,6 +72,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start moving.
 + */
++@NullMarked
 +public class SlimePathfindEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -78,7 +80,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public SlimePathfindEvent(@NotNull Slime slime) {
++    public SlimePathfindEvent(final Slime slime) {
 +        super(slime);
 +    }
 +
@@ -87,7 +89,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The Slime that is pathfinding.
 +     */
-+    @NotNull
 +    public Slime getEntity() {
 +        return (Slime) super.getEntity();
 +    }
@@ -98,16 +99,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -122,7 +121,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to start jumping while swimming in water/lava.
@@ -130,10 +129,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start jumping.
 + */
++@NullMarked
 +public class SlimeSwimEvent extends SlimeWanderEvent {
 +
 +    @ApiStatus.Internal
-+    public SlimeSwimEvent(@NotNull Slime slime) {
++    public SlimeSwimEvent(final Slime slime) {
 +        super(slime);
 +    }
 +}
@@ -148,7 +148,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.entity.LivingEntity;
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to change direction to target a LivingEntity.
@@ -156,12 +156,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start moving.
 + */
++@NullMarked
 +public class SlimeTargetLivingEntityEvent extends SlimePathfindEvent {
 +
-+    @NotNull private final LivingEntity target;
++    private final LivingEntity target;
 +
 +    @ApiStatus.Internal
-+    public SlimeTargetLivingEntityEvent(@NotNull Slime slime, @NotNull LivingEntity target) {
++    public SlimeTargetLivingEntityEvent(final Slime slime, final LivingEntity target) {
 +        super(slime);
 +        this.target = target;
 +    }
@@ -171,7 +172,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Targeted entity
 +     */
-+    @NotNull
 +    public LivingEntity getTarget() {
 +        return this.target;
 +    }
@@ -186,7 +186,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +import org.bukkit.entity.Slime;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Slime decides to start wandering.
@@ -194,10 +194,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * This event does not fire for the entity's actual movement. Only when it
 + * is choosing to start moving.
 + */
++@NullMarked
 +public class SlimeWanderEvent extends SlimePathfindEvent {
 +
 +    @ApiStatus.Internal
-+    public SlimeWanderEvent(@NotNull Slime slime) {
++    public SlimeWanderEvent(final Slime slime) {
 +        super(slime);
 +    }
 +}

patches/api/Test-changes.patch

@@ -104,6 +104,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
      @Test
 @@ -0,0 +0,0 @@ public class AnnotationTest {
+                 continue;
+             }
+ 
++            // Paper start - skip class if it's @NullMarked
++            if (isClassNullMarked(clazz)) {
++                return;
++            }
++            // Paper end - skip class if it's @NullMarked
++
+             for (MethodNode method : clazz.methods) {
+                 if (!isMethodIncluded(clazz, method, foundClasses)) {
+                     continue;
                  }
  
                  if (mustBeAnnotated(Type.getReturnType(method.desc)) && !isWellAnnotated(method.invisibleAnnotations)) {
@@ -175,6 +187,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      }
  
      private static void collectClasses(@NotNull File from, @NotNull Map<String, ClassNode> to) throws IOException {
+@@ -0,0 +0,0 @@ public class AnnotationTest {
+         }
+     }
+ 
++    // Paper start - skip class if it's @NullMarked
++    private static boolean isClassNullMarked(@NotNull ClassNode clazz) {
++        return clazz.visibleAnnotations != null && clazz.visibleAnnotations.stream().anyMatch(node -> "Lorg/jspecify/annotations/NullMarked;".equals(node.desc));
++    }
++    // Paper end - skip class if it's @NullMarked
++
+     private static boolean isClassIncluded(@NotNull ClassNode clazz, @NotNull Map<String, ClassNode> allClasses) {
+         // Exclude private, synthetic or deprecated classes and annotations, since their members can't be null
+         if ((clazz.access & (Opcodes.ACC_PRIVATE | Opcodes.ACC_SYNTHETIC | Opcodes.ACC_DEPRECATED | Opcodes.ACC_ANNOTATION)) != 0) {
 @@ -0,0 +0,0 @@ public class AnnotationTest {
              // Exceptions are excluded
              return false;

patches/api/Turtle-API.patch

@@ -17,11 +17,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Turtle decides to go home
 + */
++@NullMarked
 +public class TurtleGoHomeEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -29,7 +30,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TurtleGoHomeEvent(@NotNull Turtle turtle) {
++    public TurtleGoHomeEvent(final Turtle turtle) {
 +        super(turtle);
 +    }
 +
@@ -38,7 +39,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The turtle
 +     */
-+    @NotNull
 +    public Turtle getEntity() {
 +        return (Turtle) super.getEntity();
 +    }
@@ -49,16 +49,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -77,23 +75,23 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Turtle lays eggs
 + */
++@NullMarked
 +public class TurtleLayEggEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull
 +    private final Location location;
 +    private int eggCount;
 +
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TurtleLayEggEvent(@NotNull Turtle turtle, @NotNull Location location, int eggCount) {
++    public TurtleLayEggEvent(final Turtle turtle, final Location location, final int eggCount) {
 +        super(turtle);
 +        this.location = location;
 +        this.eggCount = eggCount;
@@ -104,7 +102,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The turtle
 +     */
-+    @NotNull
 +    public Turtle getEntity() {
 +        return (Turtle) super.getEntity();
 +    }
@@ -114,7 +111,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Location of eggs
 +     */
-+    @NotNull
 +    public Location getLocation() {
 +        return this.location.clone();
 +    }
@@ -133,7 +129,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param eggCount Number of eggs
 +     */
-+    public void setEggCount(int eggCount) {
++    public void setEggCount(final int eggCount) {
 +        if (eggCount < 1) {
 +            this.cancelled = true;
 +            return;
@@ -147,16 +143,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }
@@ -175,20 +169,21 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Fired when a Turtle starts digging to lay eggs
 + */
++@NullMarked
 +public class TurtleStartDiggingEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final Location location;
++    private final Location location;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public TurtleStartDiggingEvent(@NotNull Turtle turtle, @NotNull Location location) {
++    public TurtleStartDiggingEvent(final Turtle turtle, final Location location) {
 +        super(turtle);
 +        this.location = location;
 +    }
@@ -198,7 +193,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return The turtle
 +     */
-+    @NotNull
 +    public Turtle getEntity() {
 +        return (Turtle) super.getEntity();
 +    }
@@ -208,7 +202,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return Location where digging
 +     */
-+    @NotNull
 +    public Location getLocation() {
 +        return this.location.clone();
 +    }
@@ -219,16 +212,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/WitchConsumePotionEvent.patch

@@ -19,26 +19,26 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Fired when a witch consumes the potion in their hand to buff themselves.
 + */
++@NullMarked
 +public class WitchConsumePotionEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @Nullable private ItemStack potion;
++    private @Nullable ItemStack potion;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WitchConsumePotionEvent(@NotNull Witch witch, @Nullable ItemStack potion) {
++    public WitchConsumePotionEvent(final Witch witch, final @Nullable ItemStack potion) {
 +        super(witch);
 +        this.potion = potion;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Witch getEntity() {
 +        return (Witch) super.getEntity();
@@ -47,8 +47,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return the potion the witch will consume and have the effects applied.
 +     */
-+    @Nullable
++    public @Nullable ItemStack getPotion() {
-+    public ItemStack getPotion() {
 +        return this.potion;
 +    }
 +
@@ -57,7 +56,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param potion The potion
 +     */
-+    public void setPotion(@Nullable ItemStack potion) {
++    public void setPotion(final @Nullable ItemStack potion) {
 +        this.potion = potion != null ? potion.clone() : null;
 +    }
 +
@@ -70,16 +69,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/WitchReadyPotionEvent.patch

@@ -19,23 +19,23 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
++@NullMarked
 +public class WitchReadyPotionEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    private ItemStack potion;
++    private @Nullable ItemStack potion;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WitchReadyPotionEvent(@NotNull Witch witch, @Nullable ItemStack potion) {
++    public WitchReadyPotionEvent(final Witch witch, final @Nullable ItemStack potion) {
 +        super(witch);
 +        this.potion = potion;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Witch getEntity() {
 +        return (Witch) super.getEntity();
@@ -44,8 +44,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return the potion the witch is readying to use
 +     */
-+    @Nullable
++    public @Nullable ItemStack getPotion() {
-+    public ItemStack getPotion() {
 +        return this.potion;
 +    }
 +
@@ -54,7 +53,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param potion The potion
 +     */
-+    public void setPotion(@Nullable ItemStack potion) {
++    public void setPotion(final @Nullable ItemStack potion) {
 +        this.potion = potion != null ? potion.clone() : null;
 +    }
 +
@@ -64,17 +63,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/WitchThrowPotionEvent.patch

@@ -20,28 +20,28 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.entity.EntityEvent;
 +import org.bukkit.inventory.ItemStack;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
-+import org.jetbrains.annotations.Nullable;
++import org.jspecify.annotations.Nullable;
 +
 +/**
 + * Fired when a witch throws a potion at a player
 + */
++@NullMarked
 +public class WitchThrowPotionEvent extends EntityEvent implements Cancellable {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
 +
-+    @NotNull private final LivingEntity target;
++    private final LivingEntity target;
-+    @Nullable private ItemStack potion;
++    private @Nullable ItemStack potion;
 +    private boolean cancelled;
 +
 +    @ApiStatus.Internal
-+    public WitchThrowPotionEvent(@NotNull Witch witch, @NotNull LivingEntity target, @Nullable ItemStack potion) {
++    public WitchThrowPotionEvent(final Witch witch, final LivingEntity target, final @Nullable ItemStack potion) {
 +        super(witch);
 +        this.target = target;
 +        this.potion = potion;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public Witch getEntity() {
 +        return (Witch) super.getEntity();
@@ -50,7 +50,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The target of the potion
 +     */
-+    @NotNull
 +    public LivingEntity getTarget() {
 +        return this.target;
 +    }
@@ -58,8 +57,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @return The potion the witch will throw at a player
 +     */
-+    @Nullable
++    public @Nullable ItemStack getPotion() {
-+    public ItemStack getPotion() {
 +        return this.potion;
 +    }
 +
@@ -68,7 +66,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @param potion The potion
 +     */
-+    public void setPotion(@Nullable ItemStack potion) {
++    public void setPotion(final @Nullable ItemStack potion) {
 +        this.potion = potion != null ? potion.clone() : null;
 +    }
 +
@@ -81,17 +79,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    @Override
-+    public void setCancelled(boolean cancel) {
++    public void setCancelled(final boolean cancel) {
 +        this.cancelled = cancel;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }

patches/api/add-DragonEggFormEvent.patch

@@ -20,7 +20,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.block.BlockFormEvent;
 +import org.jetbrains.annotations.ApiStatus;
-+import org.jetbrains.annotations.NotNull;
++import org.jspecify.annotations.NullMarked;
 +
 +/**
 + * Called when the {@link EnderDragon} is defeated (killed) in a {@link DragonBattle},
@@ -30,6 +30,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 + * <b>This event might be cancelled by default depending on
 + * e.g. {@link DragonBattle#hasBeenPreviouslyKilled()} and server configuration.</b>
 + */
++@NullMarked
 +public class DragonEggFormEvent extends BlockFormEvent {
 +
 +    private static final HandlerList HANDLER_LIST = new HandlerList();
@@ -37,7 +38,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    private final DragonBattle dragonBattle;
 +
 +    @ApiStatus.Internal
-+    public DragonEggFormEvent(@NotNull Block block, @NotNull BlockState newState, @NotNull DragonBattle dragonBattle) {
++    public DragonEggFormEvent(final Block block, final BlockState newState, final DragonBattle dragonBattle) {
 +        super(block, newState);
 +        this.dragonBattle = dragonBattle;
 +    }
@@ -49,18 +50,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     *
 +     * @return the dragon battle
 +     */
-+    @NotNull
 +    public DragonBattle getDragonBattle() {
 +        return this.dragonBattle;
 +    }
 +
-+    @NotNull
 +    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }
 +
-+    @NotNull
 +    public static HandlerList getHandlerList() {
 +        return HANDLER_LIST;
 +    }