PaperMC/paper-server/patches/sources/net/minecraft/world/entity/LivingEntity.java.patch

--- a/net/minecraft/world/entity/LivingEntity.java
+++ b/net/minecraft/world/entity/LivingEntity.java
@@ -42,6 +42,8 @@
 import net.minecraft.core.particles.ParticleOptions;
 import net.minecraft.core.particles.ParticleTypes;
 import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.FloatTag;
+import net.minecraft.nbt.IntTag;
 import net.minecraft.nbt.ListTag;
 import net.minecraft.nbt.NbtOps;
 import net.minecraft.nbt.Tag;
@@ -94,7 +96,6 @@
 import net.minecraft.world.entity.animal.Wolf;
 import net.minecraft.world.entity.boss.wither.WitherBoss;
 import net.minecraft.world.entity.item.ItemEntity;
-import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.entity.projectile.AbstractArrow;
 import net.minecraft.world.entity.projectile.Projectile;
 import net.minecraft.world.item.AxeItem;
@@ -136,6 +137,30 @@
 import net.minecraft.world.scores.Scoreboard;
 import org.slf4j.Logger;
 
+// CraftBukkit start
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.LinkedList;
+import java.util.UUID;
+import net.minecraft.world.item.component.Consumable;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.attribute.CraftAttributeMap;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.ArrowBodyCountChangeEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityDamageEvent.DamageModifier;
+import org.bukkit.event.entity.EntityKnockbackEvent;
+import org.bukkit.event.entity.EntityPotionEffectEvent;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
+import org.bukkit.event.entity.EntityRemoveEvent;
+import org.bukkit.event.entity.EntityResurrectEvent;
+import org.bukkit.event.entity.EntityTeleportEvent;
+import org.bukkit.event.player.PlayerItemConsumeEvent;
+// CraftBukkit end
+
 public abstract class LivingEntity extends Entity implements Attackable {
 
     private static final Logger LOGGER = LogUtils.getLogger();
@@ -174,7 +199,7 @@
     public static final float DEFAULT_BABY_SCALE = 0.5F;
     public static final String ATTRIBUTES_FIELD = "attributes";
     public static final Predicate<LivingEntity> PLAYER_NOT_WEARING_DISGUISE_ITEM = (entityliving) -> {
-        if (entityliving instanceof Player entityhuman) {
+        if (entityliving instanceof net.minecraft.world.entity.player.Player entityhuman) {
             ItemStack itemstack = entityhuman.getItemBySlot(EquipmentSlot.HEAD);
 
             return !itemstack.is(ItemTags.GAZE_DISGUISE_EQUIPMENT);
@@ -210,7 +235,7 @@
     public float yHeadRotO;
     public final ElytraAnimationState elytraAnimationState;
     @Nullable
-    public Player lastHurtByPlayer;
+    public net.minecraft.world.entity.player.Player lastHurtByPlayer;
     public int lastHurtByPlayerTime;
     protected boolean dead;
     protected int noActionTime;
@@ -260,7 +285,29 @@
     protected boolean skipDropExperience;
     private final EnumMap<EquipmentSlot, Reference2ObjectMap<Enchantment, Set<EnchantmentLocationBasedEffect>>> activeLocationDependentEnchantments;
     protected float appliedScale;
+    // CraftBukkit start
+    public int expToDrop;
+    public ArrayList<org.bukkit.inventory.ItemStack> drops = new ArrayList<org.bukkit.inventory.ItemStack>();
+    public final org.bukkit.craftbukkit.attribute.CraftAttributeMap craftAttributes;
+    public boolean collides = true;
+    public Set<UUID> collidableExemptions = new HashSet<>();
+    public boolean bukkitPickUpLoot;
+    public org.bukkit.craftbukkit.entity.CraftLivingEntity getBukkitLivingEntity() { return (org.bukkit.craftbukkit.entity.CraftLivingEntity) super.getBukkitEntity(); } // Paper
+    public boolean silentDeath = false; // Paper - mark entity as dying silently for cancellable death event
 
+    @Override
+    public float getBukkitYaw() {
+        return this.getYHeadRot();
+    }
+    // CraftBukkit end
+    // Spigot start
+    public void inactiveTick()
+    {
+        super.inactiveTick();
+        ++this.noActionTime; // Above all the floats
+    }
+    // Spigot end
+
     protected LivingEntity(EntityType<? extends LivingEntity> type, Level world) {
         super(type, world);
         this.lastHandItemStacks = NonNullList.withSize(2, ItemStack.EMPTY);
@@ -276,7 +323,9 @@
         this.activeLocationDependentEnchantments = new EnumMap(EquipmentSlot.class);
         this.appliedScale = 1.0F;
         this.attributes = new AttributeMap(DefaultAttributes.getSupplier(type));
-        this.setHealth(this.getMaxHealth());
+        this.craftAttributes = new CraftAttributeMap(this.attributes); // CraftBukkit
+        // CraftBukkit - setHealth(getMaxHealth()) inlined and simplified to skip the instanceof check for EntityPlayer, as getBukkitEntity() is not initialized in constructor
+        this.entityData.set(LivingEntity.DATA_HEALTH_ID, (float) this.getAttribute(Attributes.MAX_HEALTH).getValue());
         this.blocksBuilding = true;
         this.rotA = (float) ((Math.random() + 1.0D) * 0.009999999776482582D);
         this.reapplyPosition();
@@ -356,7 +405,13 @@
                     double d8 = Math.min((double) (0.2F + f / 15.0F), 2.5D);
                     int i = (int) (150.0D * d8);
 
-                    worldserver.sendParticles(new BlockParticleOption(ParticleTypes.BLOCK, state), d2, d3, d4, i, 0.0D, 0.0D, 0.0D, 0.15000000596046448D);
+                    // CraftBukkit start - visiblity api
+                    if (this instanceof ServerPlayer) {
+                        worldserver.sendParticlesSource((ServerPlayer) this, new BlockParticleOption(ParticleTypes.BLOCK, state), false, false, d2, d3, d4, i, 0.0D, 0.0D, 0.0D, 0.15000000596046448D);
+                    } else {
+                        worldserver.sendParticles(new BlockParticleOption(ParticleTypes.BLOCK, state), d2, d3, d4, i, 0.0D, 0.0D, 0.0D, 0.15000000596046448D);
+                    }
+                    // CraftBukkit end
                 }
             }
         }
@@ -402,7 +457,7 @@
         }
 
         if (this.isAlive()) {
-            boolean flag = this instanceof Player;
+            boolean flag = this instanceof net.minecraft.world.entity.player.Player;
             Level world1 = this.level();
             ServerLevel worldserver1;
             double d0;
@@ -424,7 +479,7 @@
             }
 
             if (this.isEyeInFluid(FluidTags.WATER) && !this.level().getBlockState(BlockPos.containing(this.getX(), this.getEyeY(), this.getZ())).is(Blocks.BUBBLE_COLUMN)) {
-                boolean flag1 = !this.canBreatheUnderwater() && !MobEffectUtil.hasWaterBreathing(this) && (!flag || !((Player) this).getAbilities().invulnerable);
+                boolean flag1 = !this.canBreatheUnderwater() && !MobEffectUtil.hasWaterBreathing(this) && (!flag || !((net.minecraft.world.entity.player.Player) this).getAbilities().invulnerable);
 
                 if (flag1) {
                     this.setAirSupply(this.decreaseAirSupply(this.getAirSupply()));
@@ -573,7 +628,7 @@
         ++this.deathTime;
         if (this.deathTime >= 20 && !this.level().isClientSide() && !this.isRemoved()) {
             this.level().broadcastEntityEvent(this, (byte) 60);
-            this.remove(Entity.RemovalReason.KILLED);
+            this.remove(Entity.RemovalReason.KILLED, EntityRemoveEvent.Cause.DEATH); // CraftBukkit - add Bukkit remove cause
         }
 
     }
@@ -629,7 +684,7 @@
         return this.lastHurtByMobTimestamp;
     }
 
-    public void setLastHurtByPlayer(@Nullable Player attacking) {
+    public void setLastHurtByPlayer(@Nullable net.minecraft.world.entity.player.Player attacking) {
         this.lastHurtByPlayer = attacking;
         this.lastHurtByPlayerTime = this.tickCount;
     }
@@ -679,17 +734,23 @@
     }
 
     public void onEquipItem(EquipmentSlot slot, ItemStack oldStack, ItemStack newStack) {
-        if (!this.level().isClientSide() && !this.isSpectator()) {
-            boolean flag = newStack.isEmpty() && oldStack.isEmpty();
+        // CraftBukkit start
+        this.onEquipItem(slot, oldStack, newStack, false);
+    }
 
-            if (!flag && !ItemStack.isSameItemSameComponents(oldStack, newStack) && !this.firstTick) {
-                Equippable equippable = (Equippable) newStack.get(DataComponents.EQUIPPABLE);
+    public void onEquipItem(EquipmentSlot enumitemslot, ItemStack itemstack, ItemStack itemstack1, boolean silent) {
+        // CraftBukkit end
+        if (!this.level().isClientSide() && !this.isSpectator()) {
+            boolean flag = itemstack1.isEmpty() && itemstack.isEmpty();
 
-                if (!this.isSilent() && equippable != null && slot == equippable.slot()) {
-                    this.level().playSeededSound((Player) null, this.getX(), this.getY(), this.getZ(), equippable.equipSound(), this.getSoundSource(), 1.0F, 1.0F, this.random.nextLong());
+            if (!flag && !ItemStack.isSameItemSameComponents(itemstack, itemstack1) && !this.firstTick) {
+                Equippable equippable = (Equippable) itemstack1.get(DataComponents.EQUIPPABLE);
+
+                if (!this.isSilent() && equippable != null && enumitemslot == equippable.slot() && !silent) { // CraftBukkit
+                    this.level().playSeededSound((net.minecraft.world.entity.player.Player) null, this.getX(), this.getY(), this.getZ(), equippable.equipSound(), this.getSoundSource(), 1.0F, 1.0F, this.random.nextLong());
                 }
 
-                if (this.doesEmitEquipEvent(slot)) {
+                if (this.doesEmitEquipEvent(enumitemslot)) {
                     this.gameEvent(equippable != null ? GameEvent.EQUIP : GameEvent.UNEQUIP);
                 }
 
@@ -699,17 +760,24 @@
 
     @Override
     public void remove(Entity.RemovalReason reason) {
-        if (reason == Entity.RemovalReason.KILLED || reason == Entity.RemovalReason.DISCARDED) {
+        // CraftBukkit start - add Bukkit remove cause
+        this.remove(reason, null);
+    }
+
+    @Override
+    public void remove(Entity.RemovalReason entity_removalreason, EntityRemoveEvent.Cause cause) {
+        // CraftBukkit end
+        if (entity_removalreason == Entity.RemovalReason.KILLED || entity_removalreason == Entity.RemovalReason.DISCARDED) {
             Level world = this.level();
 
             if (world instanceof ServerLevel) {
                 ServerLevel worldserver = (ServerLevel) world;
 
-                this.triggerOnDeathMobEffects(worldserver, reason);
+                this.triggerOnDeathMobEffects(worldserver, entity_removalreason);
             }
         }
 
-        super.remove(reason);
+        super.remove(entity_removalreason, cause); // CraftBukkit
         this.brain.clearMemories();
     }
 
@@ -722,6 +790,7 @@
             mobeffect.onMobRemoved(world, this, reason);
         }
 
+        this.removeAllEffects(org.bukkit.event.entity.EntityPotionEffectEvent.Cause.DEATH); // CraftBukkit
         this.activeEffects.clear();
     }
 
@@ -763,7 +832,13 @@
 
     @Override
     public void readAdditionalSaveData(CompoundTag nbt) {
-        this.internalSetAbsorptionAmount(nbt.getFloat("AbsorptionAmount"));
+        // Paper start - Check for NaN
+        float absorptionAmount = nbt.getFloat("AbsorptionAmount");
+        if (Float.isNaN(absorptionAmount)) {
+            absorptionAmount = 0;
+        }
+        this.internalSetAbsorptionAmount(absorptionAmount);
+        // Paper end - Check for NaN
         if (nbt.contains("attributes", 9) && this.level() != null && !this.level().isClientSide) {
             this.getAttributes().load(nbt.getList("attributes", 10));
         }
@@ -781,6 +856,17 @@
             }
         }
 
+        // CraftBukkit start
+        if (nbt.contains("Bukkit.MaxHealth")) {
+            Tag nbtbase = nbt.get("Bukkit.MaxHealth");
+            if (nbtbase.getId() == 5) {
+                this.getAttribute(Attributes.MAX_HEALTH).setBaseValue(((FloatTag) nbtbase).getAsDouble());
+            } else if (nbtbase.getId() == 3) {
+                this.getAttribute(Attributes.MAX_HEALTH).setBaseValue(((IntTag) nbtbase).getAsDouble());
+            }
+        }
+        // CraftBukkit end
+
         if (nbt.contains("Health", 99)) {
             this.setHealth(nbt.getFloat("Health"));
         }
@@ -792,6 +878,7 @@
             String s = nbt.getString("Team");
             Scoreboard scoreboard = this.level().getScoreboard();
             PlayerTeam scoreboardteam = scoreboard.getPlayerTeam(s);
+            if (!this.level().paperConfig().scoreboards.allowNonPlayerEntitiesOnScoreboards && !(this instanceof net.minecraft.world.entity.player.Player)) { scoreboardteam = null; } // Paper - Perf: Disable Scoreboards for non players by default
             boolean flag = scoreboardteam != null && scoreboard.addPlayerToTeam(this.getStringUUID(), scoreboardteam);
 
             if (!flag) {
@@ -818,10 +905,33 @@
         }
 
     }
+
+    // CraftBukkit start
+    private boolean isTickingEffects = false;
+    private List<ProcessableEffect> effectsToProcess = Lists.newArrayList();
+
+    private static class ProcessableEffect {
+
+        private Holder<MobEffect> type;
+        private MobEffectInstance effect;
+        private final EntityPotionEffectEvent.Cause cause;
+
+        private ProcessableEffect(MobEffectInstance effect, EntityPotionEffectEvent.Cause cause) {
+            this.effect = effect;
+            this.cause = cause;
+        }
+
+        private ProcessableEffect(Holder<MobEffect> type, EntityPotionEffectEvent.Cause cause) {
+            this.type = type;
+            this.cause = cause;
+        }
+    }
+    // CraftBukkit end
 
     protected void tickEffects() {
         Iterator<Holder<MobEffect>> iterator = this.activeEffects.keySet().iterator();
 
+        this.isTickingEffects = true; // CraftBukkit
         try {
             while (iterator.hasNext()) {
                 Holder<MobEffect> holder = (Holder) iterator.next();
@@ -831,6 +941,12 @@
                     this.onEffectUpdated(mobeffect, true, (Entity) null);
                 })) {
                     if (!this.level().isClientSide) {
+                        // CraftBukkit start
+                        EntityPotionEffectEvent event = CraftEventFactory.callEntityPotionEffectChangeEvent(this, mobeffect, null, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.EXPIRATION);
+                        if (event.isCancelled()) {
+                            continue;
+                        }
+                        // CraftBukkit end
                         iterator.remove();
                         this.onEffectsRemoved(List.of(mobeffect));
                     }
@@ -841,6 +957,17 @@
         } catch (ConcurrentModificationException concurrentmodificationexception) {
             ;
         }
+        // CraftBukkit start
+        this.isTickingEffects = false;
+        for (ProcessableEffect e : this.effectsToProcess) {
+            if (e.effect != null) {
+                this.addEffect(e.effect, e.cause);
+            } else {
+                this.removeEffect(e.type, e.cause);
+            }
+        }
+        this.effectsToProcess.clear();
+        // CraftBukkit end
 
         if (this.effectsDirty) {
             if (!this.level().isClientSide) {
@@ -921,7 +1048,7 @@
     }
 
     public boolean canAttack(LivingEntity target) {
-        return target instanceof Player && this.level().getDifficulty() == Difficulty.PEACEFUL ? false : target.canBeSeenAsEnemy();
+        return target instanceof net.minecraft.world.entity.player.Player && this.level().getDifficulty() == Difficulty.PEACEFUL ? false : target.canBeSeenAsEnemy();
     }
 
     public boolean canBeSeenAsEnemy() {
@@ -952,17 +1079,36 @@
         this.entityData.set(LivingEntity.DATA_EFFECT_PARTICLES, List.of());
     }
 
+    // CraftBukkit start
     public boolean removeAllEffects() {
+        return this.removeAllEffects(org.bukkit.event.entity.EntityPotionEffectEvent.Cause.UNKNOWN);
+    }
+
+    public boolean removeAllEffects(EntityPotionEffectEvent.Cause cause) {
+        // CraftBukkit end
         if (this.level().isClientSide) {
             return false;
         } else if (this.activeEffects.isEmpty()) {
             return false;
         } else {
-            Map<Holder<MobEffect>, MobEffectInstance> map = Maps.newHashMap(this.activeEffects);
+            // CraftBukkit start
+            List<MobEffectInstance> toRemove = new LinkedList<>();
+            Iterator<MobEffectInstance> iterator = this.activeEffects.values().iterator();
 
-            this.activeEffects.clear();
-            this.onEffectsRemoved(map.values());
-            return true;
+            while (iterator.hasNext()) {
+                MobEffectInstance effect = iterator.next();
+                EntityPotionEffectEvent event = CraftEventFactory.callEntityPotionEffectChangeEvent(this, effect, null, cause, EntityPotionEffectEvent.Action.CLEARED);
+                if (event.isCancelled()) {
+                    continue;
+                }
+
+                iterator.remove();
+                toRemove.add(effect);
+            }
+
+            this.onEffectsRemoved(toRemove);
+            return !toRemove.isEmpty();
+            // CraftBukkit end
         }
     }
 
@@ -987,24 +1133,55 @@
         return this.addEffect(effect, (Entity) null);
     }
 
+    // CraftBukkit start
+    public boolean addEffect(MobEffectInstance mobeffect, EntityPotionEffectEvent.Cause cause) {
+        return this.addEffect(mobeffect, (Entity) null, cause);
+    }
+
     public boolean addEffect(MobEffectInstance effect, @Nullable Entity source) {
-        if (!this.canBeAffected(effect)) {
+        return this.addEffect(effect, source, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.UNKNOWN);
+    }
+
+    public boolean addEffect(MobEffectInstance mobeffect, @Nullable Entity entity, EntityPotionEffectEvent.Cause cause) {
+        // org.spigotmc.AsyncCatcher.catchOp("effect add"); // Spigot // Paper - move to API
+        if (this.isTickingEffects) {
+            this.effectsToProcess.add(new ProcessableEffect(mobeffect, cause));
+            return true;
+        }
+        // CraftBukkit end
+
+        if (!this.canBeAffected(mobeffect)) {
             return false;
         } else {
-            MobEffectInstance mobeffect1 = (MobEffectInstance) this.activeEffects.get(effect.getEffect());
+            MobEffectInstance mobeffect1 = (MobEffectInstance) this.activeEffects.get(mobeffect.getEffect());
             boolean flag = false;
 
-            if (mobeffect1 == null) {
-                this.activeEffects.put(effect.getEffect(), effect);
-                this.onEffectAdded(effect, source);
+            // CraftBukkit start
+            boolean override = false;
+            if (mobeffect1 != null) {
+                override = new MobEffectInstance(mobeffect1).update(mobeffect);
+            }
+
+            EntityPotionEffectEvent event = CraftEventFactory.callEntityPotionEffectChangeEvent(this, mobeffect1, mobeffect, cause, override);
+            if (event.isCancelled()) {
+                return false;
+            }
+            // CraftBukkit end
+
+            if (mobeffect1 == null) {
+                this.activeEffects.put(mobeffect.getEffect(), mobeffect);
+                this.onEffectAdded(mobeffect, entity);
                 flag = true;
-                effect.onEffectAdded(this);
-            } else if (mobeffect1.update(effect)) {
-                this.onEffectUpdated(mobeffect1, true, source);
+                mobeffect.onEffectAdded(this);
+                // CraftBukkit start
+            } else if (event.isOverride()) {
+                mobeffect1.update(mobeffect);
+                this.onEffectUpdated(mobeffect1, true, entity);
+                // CraftBukkit end
                 flag = true;
             }
 
-            effect.onEffectStarted(this);
+            mobeffect.onEffectStarted(this);
             return flag;
         }
     }
@@ -1031,14 +1208,40 @@
         return this.getType().is(EntityTypeTags.INVERTED_HEALING_AND_HARM);
     }
 
+    // CraftBukkit start
     @Nullable
     public MobEffectInstance removeEffectNoUpdate(Holder<MobEffect> effect) {
-        return (MobEffectInstance) this.activeEffects.remove(effect);
+        return this.removeEffectNoUpdate(effect, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.UNKNOWN);
     }
 
+    @Nullable
+    public MobEffectInstance removeEffectNoUpdate(Holder<MobEffect> holder, EntityPotionEffectEvent.Cause cause) {
+        if (this.isTickingEffects) {
+            this.effectsToProcess.add(new ProcessableEffect(holder, cause));
+            return null;
+        }
+
+        MobEffectInstance effect = this.activeEffects.get(holder);
+        if (effect == null) {
+            return null;
+        }
+
+        EntityPotionEffectEvent event = CraftEventFactory.callEntityPotionEffectChangeEvent(this, effect, null, cause);
+        if (event.isCancelled()) {
+            return null;
+        }
+
+        return (MobEffectInstance) this.activeEffects.remove(holder);
+    }
+
     public boolean removeEffect(Holder<MobEffect> effect) {
-        MobEffectInstance mobeffect = this.removeEffectNoUpdate(effect);
+        return this.removeEffect(effect, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.UNKNOWN);
+    }
 
+    public boolean removeEffect(Holder<MobEffect> holder, EntityPotionEffectEvent.Cause cause) {
+        MobEffectInstance mobeffect = this.removeEffectNoUpdate(holder, cause);
+        // CraftBukkit end
+
         if (mobeffect != null) {
             this.onEffectsRemoved(List.of(mobeffect));
             return true;
@@ -1142,20 +1345,65 @@
 
     }
 
+    // CraftBukkit start - Delegate so we can handle providing a reason for health being regained
     public void heal(float amount) {
+        this.heal(amount, EntityRegainHealthEvent.RegainReason.CUSTOM);
+    }
+
+    public void heal(float f, EntityRegainHealthEvent.RegainReason regainReason) {
+        // Paper start - Forward
+        heal(f, regainReason, false);
+    }
+
+    public void heal(float f, EntityRegainHealthEvent.RegainReason regainReason, boolean isFastRegen) {
+        // Paper end
         float f1 = this.getHealth();
 
         if (f1 > 0.0F) {
-            this.setHealth(f1 + amount);
+            EntityRegainHealthEvent event = new EntityRegainHealthEvent(this.getBukkitEntity(), f, regainReason, isFastRegen); // Paper
+            // Suppress during worldgen
+            if (this.valid) {
+                this.level().getCraftServer().getPluginManager().callEvent(event);
+            }
+
+            if (!event.isCancelled()) {
+                this.setHealth((float) (this.getHealth() + event.getAmount()));
+            }
+            // CraftBukkit end
         }
 
     }
 
     public float getHealth() {
+        // CraftBukkit start - Use unscaled health
+        if (this instanceof ServerPlayer) {
+            return (float) ((ServerPlayer) this).getBukkitEntity().getHealth();
+        }
+        // CraftBukkit end
         return (Float) this.entityData.get(LivingEntity.DATA_HEALTH_ID);
     }
 
     public void setHealth(float health) {
+        // Paper start - Check for NaN
+        if (Float.isNaN(health)) { health = getMaxHealth(); if (this.valid) {
+            System.err.println("[NAN-HEALTH] " + getScoreboardName() + " had NaN health set");
+        } } // Paper end - Check for NaN
+        // CraftBukkit start - Handle scaled health
+        if (this instanceof ServerPlayer) {
+            org.bukkit.craftbukkit.entity.CraftPlayer player = ((ServerPlayer) this).getBukkitEntity();
+            // Squeeze
+            if (health < 0.0F) {
+                player.setRealHealth(0.0D);
+            } else if (health > player.getMaxHealth()) {
+                player.setRealHealth(player.getMaxHealth());
+            } else {
+                player.setRealHealth(health);
+            }
+
+            player.updateScaledHealth(false);
+            return;
+        }
+        // CraftBukkit end
         this.entityData.set(LivingEntity.DATA_HEALTH_ID, Mth.clamp(health, 0.0F, this.getMaxHealth()));
     }
 
@@ -1167,7 +1415,7 @@
     public boolean hurtServer(ServerLevel world, DamageSource source, float amount) {
         if (this.isInvulnerableTo(world, source)) {
             return false;
-        } else if (this.isDeadOrDying()) {
+        } else if (this.isRemoved() || this.dead || this.getHealth() <= 0.0F) { // CraftBukkit - Don't allow entities that got set to dead/killed elsewhere to get damaged and die
             return false;
         } else if (source.is(DamageTypeTags.IS_FIRE) && this.hasEffect(MobEffects.FIRE_RESISTANCE)) {
             return false;
@@ -1182,10 +1430,11 @@
             }
 
             float f1 = amount;
-            boolean flag = false;
+            boolean flag = amount > 0.0F && this.isDamageSourceBlocked(source); // Copied from below
             float f2 = 0.0F;
 
-            if (amount > 0.0F && this.isDamageSourceBlocked(source)) {
+            // CraftBukkit - Moved into handleEntityDamage(DamageSource, float) for get f and actuallyHurt(DamageSource, float, EntityDamageEvent) for handle damage
+            if (false && amount > 0.0F && this.isDamageSourceBlocked(source)) {
                 this.hurtCurrentlyUsedShield(amount);
                 f2 = amount;
                 amount = 0.0F;
@@ -1202,15 +1451,26 @@
                 flag = true;
             }
 
-            if (source.is(DamageTypeTags.IS_FREEZING) && this.getType().is(EntityTypeTags.FREEZE_HURTS_EXTRA_TYPES)) {
+            // CraftBukkit - Moved into handleEntityDamage(DamageSource, float) for get f
+            if (false && source.is(DamageTypeTags.IS_FREEZING) && this.getType().is(EntityTypeTags.FREEZE_HURTS_EXTRA_TYPES)) {
                 amount *= 5.0F;
             }
 
-            if (source.is(DamageTypeTags.DAMAGES_HELMET) && !this.getItemBySlot(EquipmentSlot.HEAD).isEmpty()) {
+            // CraftBukkit - Moved into handleEntityDamage(DamageSource, float) for get f and actuallyHurt(DamageSource, float, EntityDamageEvent) for handle damage
+            if (false && source.is(DamageTypeTags.DAMAGES_HELMET) && !this.getItemBySlot(EquipmentSlot.HEAD).isEmpty()) {
                 this.hurtHelmet(source, amount);
                 amount *= 0.75F;
             }
 
+            // CraftBukkit start
+            EntityDamageEvent event = this.handleEntityDamage(source, amount);
+            amount = 0;
+            amount += (float) event.getDamage(DamageModifier.BASE);
+            amount += (float) event.getDamage(DamageModifier.BLOCKING);
+            amount += (float) event.getDamage(DamageModifier.FREEZING);
+            amount += (float) event.getDamage(DamageModifier.HARD_HAT);
+            // CraftBukkit end
+
             this.walkAnimation.setSpeed(1.5F);
             if (Float.isNaN(amount) || Float.isInfinite(amount)) {
                 amount = Float.MAX_VALUE;
@@ -1218,18 +1478,27 @@
 
             boolean flag1 = true;
 
-            if ((float) this.invulnerableTime > 10.0F && !source.is(DamageTypeTags.BYPASSES_COOLDOWN)) {
+            if ((float) this.invulnerableTime > (float) this.invulnerableDuration / 2.0F && !source.is(DamageTypeTags.BYPASSES_COOLDOWN)) { // CraftBukkit - restore use of maxNoDamageTicks
                 if (amount <= this.lastHurt) {
                     return false;
                 }
 
-                this.actuallyHurt(world, source, amount - this.lastHurt);
+                // CraftBukkit start
+                if (!this.actuallyHurt(world, source, (float) event.getFinalDamage() - this.lastHurt, event)) {
+                    return false;
+                }
+                // CraftBukkit end
                 this.lastHurt = amount;
                 flag1 = false;
             } else {
+                // CraftBukkit start
+                if (!this.actuallyHurt(world, source, (float) event.getFinalDamage(), event)) {
+                    return false;
+                }
                 this.lastHurt = amount;
-                this.invulnerableTime = 20;
-                this.actuallyHurt(world, source, amount);
+                this.invulnerableTime = this.invulnerableDuration; // CraftBukkit - restore use of maxNoDamageTicks
+                // this.actuallyHurt(worldserver, damagesource, f);
+                // CraftBukkit end
                 this.hurtDuration = 10;
                 this.hurtTime = this.hurtDuration;
             }
@@ -1243,7 +1512,7 @@
                     world.broadcastDamageEvent(this, source);
                 }
 
-                if (!source.is(DamageTypeTags.NO_IMPACT) && (!flag || amount > 0.0F)) {
+                if (!source.is(DamageTypeTags.NO_IMPACT) && !flag) { // CraftBukkit - Prevent marking hurt if the damage is blocked
                     this.markHurt();
                 }
 
@@ -1263,7 +1532,7 @@
                         d1 = source.getSourcePosition().z() - this.getZ();
                     }
 
-                    this.knockback(0.4000000059604645D, d0, d1);
+                    this.knockback(0.4000000059604645D, d0, d1, entity1, entity1 == null ? io.papermc.paper.event.entity.EntityKnockbackEvent.Cause.DAMAGE : io.papermc.paper.event.entity.EntityKnockbackEvent.Cause.ENTITY_ATTACK); // CraftBukkit // Paper - knockback events
                     if (!flag) {
                         this.indicateDamage(d0, d1);
                     }
@@ -1272,17 +1541,18 @@
 
             if (this.isDeadOrDying()) {
                 if (!this.checkTotemDeathProtection(source)) {
-                    if (flag1) {
-                        this.makeSound(this.getDeathSound());
-                    }
+                    // Paper start - moved into CraftEventFactory event caller for cancellable death event
+                    this.silentDeath = !flag1; // mark entity as dying silently
+                    // Paper end
 
                     this.die(source);
+                    this.silentDeath = false; // Paper - cancellable death event - reset to default
                 }
             } else if (flag1) {
                 this.playHurtSound(source);
             }
 
-            boolean flag2 = !flag || amount > 0.0F;
+            boolean flag2 = !flag; // CraftBukkit - Ensure to return false if damage is blocked
 
             if (flag2) {
                 this.lastDamageSource = source;
@@ -1329,10 +1599,10 @@
     }
 
     @Nullable
-    protected Player resolvePlayerResponsibleForDamage(DamageSource damageSource) {
+    protected net.minecraft.world.entity.player.Player resolvePlayerResponsibleForDamage(DamageSource damageSource) {
         Entity entity = damageSource.getEntity();
 
-        if (entity instanceof Player entityhuman) {
+        if (entity instanceof net.minecraft.world.entity.player.Player entityhuman) {
             this.lastHurtByPlayerTime = 100;
             this.lastHurtByPlayer = entityhuman;
             return entityhuman;
@@ -1342,8 +1612,8 @@
                     this.lastHurtByPlayerTime = 100;
                     LivingEntity entityliving = entitywolf.getOwner();
 
-                    if (entityliving instanceof Player) {
-                        Player entityhuman1 = (Player) entityliving;
+                    if (entityliving instanceof net.minecraft.world.entity.player.Player) {
+                        net.minecraft.world.entity.player.Player entityhuman1 = (net.minecraft.world.entity.player.Player) entityliving;
 
                         this.lastHurtByPlayer = entityhuman1;
                     } else {
@@ -1363,7 +1633,7 @@
     }
 
     protected void blockedByShield(LivingEntity target) {
-        target.knockback(0.5D, target.getX() - this.getX(), target.getZ() - this.getZ());
+        target.knockback(0.5D, target.getX() - this.getX(), target.getZ() - this.getZ(), this, io.papermc.paper.event.entity.EntityKnockbackEvent.Cause.SHIELD_BLOCK); // CraftBukkit // Paper - fix attacker & knockback events
     }
 
     private boolean checkTotemDeathProtection(DamageSource source) {
@@ -1375,20 +1645,33 @@
             InteractionHand[] aenumhand = InteractionHand.values();
             int i = aenumhand.length;
 
+            // CraftBukkit start
+            InteractionHand hand = null;
+            ItemStack itemstack1 = ItemStack.EMPTY;
             for (int j = 0; j < i; ++j) {
                 InteractionHand enumhand = aenumhand[j];
-                ItemStack itemstack1 = this.getItemInHand(enumhand);
+                itemstack1 = this.getItemInHand(enumhand);
 
                 deathprotection = (DeathProtection) itemstack1.get(DataComponents.DEATH_PROTECTION);
                 if (deathprotection != null) {
+                    hand = enumhand; // CraftBukkit
                     itemstack = itemstack1.copy();
-                    itemstack1.shrink(1);
+                    // itemstack1.subtract(1); // CraftBukkit
                     break;
                 }
             }
 
-            if (itemstack != null) {
-                if (this instanceof ServerPlayer) {
+            org.bukkit.inventory.EquipmentSlot handSlot = (hand != null) ? org.bukkit.craftbukkit.CraftEquipmentSlot.getHand(hand) : null;
+            EntityResurrectEvent event = new EntityResurrectEvent((org.bukkit.entity.LivingEntity) this.getBukkitEntity(), handSlot);
+            event.setCancelled(itemstack == null);
+            this.level().getCraftServer().getPluginManager().callEvent(event);
+
+            if (!event.isCancelled()) {
+                if (!itemstack1.isEmpty()) {
+                    itemstack1.shrink(1);
+                }
+                if (itemstack != null && this instanceof ServerPlayer) {
+                    // CraftBukkit end
                     ServerPlayer entityplayer = (ServerPlayer) this;
 
                     entityplayer.awardStat(Stats.ITEM_USED.get(itemstack.getItem()));
@@ -1468,6 +1751,7 @@
             Entity entity = damageSource.getEntity();
             LivingEntity entityliving = this.getKillCredit();
 
+            /* // Paper - move down to make death event cancellable - this is the awardKillScore below
             if (entityliving != null) {
                 entityliving.awardKillScore(this, damageSource);
             }
@@ -1477,26 +1761,61 @@
             }
 
             if (!this.level().isClientSide && this.hasCustomName()) {
-                LivingEntity.LOGGER.info("Named entity {} died: {}", this, this.getCombatTracker().getDeathMessage().getString());
+                if (org.spigotmc.SpigotConfig.logNamedDeaths) LivingEntity.LOGGER.info("Named entity {} died: {}", this, this.getCombatTracker().getDeathMessage().getString()); // Spigot
             }
+            */ // Paper - move down to make death event cancellable - this is the awardKillScore below
 
             this.dead = true;
-            this.getCombatTracker().recheckStatus();
+            // Paper - moved into if below
             Level world = this.level();
 
             if (world instanceof ServerLevel) {
                 ServerLevel worldserver = (ServerLevel) world;
+                // Paper - move below into if for onKill
 
-                if (entity == null || entity.killedEntity(worldserver, this)) {
+                // Paper start
+                org.bukkit.event.entity.EntityDeathEvent deathEvent = this.dropAllDeathLoot(worldserver, damageSource);
+                if (deathEvent == null || !deathEvent.isCancelled()) {
+                    //if (entityliving != null) { // Paper - Fix item duplication and teleport issues; moved to be run earlier in #dropAllDeathLoot before destroying the drop items in CraftEventFactory#callEntityDeathEvent
+                    //    entityliving.awardKillScore(this, damageSource);
+                    //}
+                    // Paper start - clear equipment if event is not cancelled
+                    if (this instanceof Mob) {
+                        for (EquipmentSlot slot : this.clearedEquipmentSlots) {
+                            this.setItemSlot(slot, ItemStack.EMPTY);
+                        }
+                        this.clearedEquipmentSlots.clear();
+                    }
+                    // Paper end
+
+                    if (this.isSleeping()) {
+                        this.stopSleeping();
+                    }
+
+                    if (!this.level().isClientSide && this.hasCustomName()) {
+                        if (org.spigotmc.SpigotConfig.logNamedDeaths) LivingEntity.LOGGER.info("Named entity {} died: {}", this, this.getCombatTracker().getDeathMessage().getString()); // Spigot
+                    }
+
+                    this.getCombatTracker().recheckStatus();
+                    if (entity != null) {
+                        entity.killedEntity((ServerLevel) this.level(), this);
+                    }
                     this.gameEvent(GameEvent.ENTITY_DIE);
-                    this.dropAllDeathLoot(worldserver, damageSource);
+                } else {
+                    this.dead = false;
+                    this.setHealth((float) deathEvent.getReviveHealth());
+                }
+                // Paper end
                     this.createWitherRose(entityliving);
                 }
 
+            // Paper start
+            if (this.dead) { // Paper
                 this.level().broadcastEntityEvent(this, (byte) 3);
-            }
 
             this.setPose(Pose.DYING);
+            }
+            // Paper end
         }
     }
 
@@ -1506,20 +1825,28 @@
         if (world instanceof ServerLevel worldserver) {
             boolean flag = false;
 
-            if (adversary instanceof WitherBoss) {
+            if (this.dead && adversary instanceof WitherBoss) { // Paper
                 if (worldserver.getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING)) {
                     BlockPos blockposition = this.blockPosition();
                     BlockState iblockdata = Blocks.WITHER_ROSE.defaultBlockState();
 
                     if (this.level().getBlockState(blockposition).isAir() && iblockdata.canSurvive(this.level(), blockposition)) {
-                        this.level().setBlock(blockposition, iblockdata, 3);
-                        flag = true;
+                        // CraftBukkit start - call EntityBlockFormEvent for Wither Rose
+                        flag = org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockFormEvent(this.level(), blockposition, iblockdata, 3, this);
+                        // CraftBukkit end
                     }
                 }
 
                 if (!flag) {
                     ItemEntity entityitem = new ItemEntity(this.level(), this.getX(), this.getY(), this.getZ(), new ItemStack(Items.WITHER_ROSE));
 
+                    // CraftBukkit start
+                    org.bukkit.event.entity.EntityDropItemEvent event = new org.bukkit.event.entity.EntityDropItemEvent(this.getBukkitEntity(), (org.bukkit.entity.Item) entityitem.getBukkitEntity());
+                    CraftEventFactory.callEvent(event);
+                    if (event.isCancelled()) {
+                        return;
+                    }
+                    // CraftBukkit end
                     this.level().addFreshEntity(entityitem);
                 }
             }
@@ -1527,25 +1854,58 @@
         }
     }
 
-    protected void dropAllDeathLoot(ServerLevel world, DamageSource damageSource) {
+    // Paper start
+    protected boolean clearEquipmentSlots = true;
+    protected Set<EquipmentSlot> clearedEquipmentSlots = new java.util.HashSet<>();
+    protected org.bukkit.event.entity.EntityDeathEvent dropAllDeathLoot(ServerLevel world, DamageSource damageSource) {
+        // Paper end
         boolean flag = this.lastHurtByPlayerTime > 0;
 
+        this.dropEquipment(world); // CraftBukkit - from below
         if (this.shouldDropLoot() && world.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT)) {
             this.dropFromLootTable(world, damageSource, flag);
+            // Paper start
+            final boolean prev = this.clearEquipmentSlots;
+            this.clearEquipmentSlots = false;
+            this.clearedEquipmentSlots.clear();
+            // Paper end
             this.dropCustomDeathLoot(world, damageSource, flag);
+            this.clearEquipmentSlots = prev; // Paper
         }
+        // CraftBukkit start - Call death event // Paper start - call advancement triggers with correct entity equipment
+        org.bukkit.event.entity.EntityDeathEvent deathEvent = CraftEventFactory.callEntityDeathEvent(this, damageSource, this.drops, () -> {
+            final LivingEntity entityliving = this.getKillCredit();
+            if (entityliving != null) {
+                entityliving.awardKillScore(this, damageSource);
+            }
+        }); // Paper end
+        this.postDeathDropItems(deathEvent); // Paper
+        this.drops = new ArrayList<>();
+        // CraftBukkit end
 
-        this.dropEquipment(world);
+        // this.dropEquipment(worldserver);// CraftBukkit - moved up
         this.dropExperience(world, damageSource.getEntity());
+        return deathEvent; // Paper
     }
 
     protected void dropEquipment(ServerLevel world) {}
+    protected void postDeathDropItems(org.bukkit.event.entity.EntityDeathEvent event) {} // Paper - method for post death logic that cannot be ran before the event is potentially cancelled
 
-    protected void dropExperience(ServerLevel world, @Nullable Entity attacker) {
-        if (!this.wasExperienceConsumed() && (this.isAlwaysExperienceDropper() || this.lastHurtByPlayerTime > 0 && this.shouldDropExperience() && world.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT))) {
-            ExperienceOrb.award(world, this.position(), this.getExperienceReward(world, attacker));
+    public int getExpReward(ServerLevel worldserver, @Nullable Entity entity) { // CraftBukkit
+        if (!this.wasExperienceConsumed() && (this.isAlwaysExperienceDropper() || this.lastHurtByPlayerTime > 0 && this.shouldDropExperience() && worldserver.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT))) {
+            return this.getExperienceReward(worldserver, entity); // CraftBukkit            }
         }
+
+        return 0; // CraftBukkit
+    }
 
+    protected void dropExperience(ServerLevel world, @Nullable Entity attacker) {
+        // CraftBukkit start - Update getExpReward() above if the removed if() changes!
+        if (!(this instanceof net.minecraft.world.entity.boss.enderdragon.EnderDragon)) { // CraftBukkit - SPIGOT-2420: Special case ender dragon will drop the xp over time
+            ExperienceOrb.award(world, this.position(), this.expToDrop, this instanceof ServerPlayer ? org.bukkit.entity.ExperienceOrb.SpawnReason.PLAYER_DEATH : org.bukkit.entity.ExperienceOrb.SpawnReason.ENTITY_DEATH, attacker, this); // Paper
+            this.expToDrop = 0;
+        }
+        // CraftBukkit end
     }
 
     protected void dropCustomDeathLoot(ServerLevel world, DamageSource source, boolean causedByPlayer) {}
@@ -1612,19 +1972,35 @@
     }
 
     public void knockback(double strength, double x, double z) {
-        strength *= 1.0D - this.getAttributeValue(Attributes.KNOCKBACK_RESISTANCE);
-        if (strength > 0.0D) {
-            this.hasImpulse = true;
+        // CraftBukkit start - EntityKnockbackEvent
+        this.knockback(strength, x, z, null, io.papermc.paper.event.entity.EntityKnockbackEvent.Cause.UNKNOWN); // Paper - knockback events
+    }
 
+    public void knockback(double d0, double d1, double d2, @Nullable Entity attacker, io.papermc.paper.event.entity.EntityKnockbackEvent.Cause cause) { // Paper - knockback events
+        d0 *= 1.0D - this.getAttributeValue(Attributes.KNOCKBACK_RESISTANCE);
+        if (true || d0 > 0.0D) { // CraftBukkit - Call event even when force is 0
+            //this.hasImpulse = true; // CraftBukkit - Move down
+
             Vec3 vec3d;
 
-            for (vec3d = this.getDeltaMovement(); x * x + z * z < 9.999999747378752E-6D; z = (Math.random() - Math.random()) * 0.01D) {
-                x = (Math.random() - Math.random()) * 0.01D;
+            for (vec3d = this.getDeltaMovement(); d1 * d1 + d2 * d2 < 9.999999747378752E-6D; d2 = (Math.random() - Math.random()) * 0.01D) {
+                d1 = (Math.random() - Math.random()) * 0.01D;
             }
 
-            Vec3 vec3d1 = (new Vec3(x, 0.0D, z)).normalize().scale(strength);
+            Vec3 vec3d1 = (new Vec3(d1, 0.0D, d2)).normalize().scale(d0);
 
-            this.setDeltaMovement(vec3d.x / 2.0D - vec3d1.x, this.onGround() ? Math.min(0.4D, vec3d.y / 2.0D + strength) : vec3d.y, vec3d.z / 2.0D - vec3d1.z);
+            // Paper start - knockback events
+            Vec3 finalVelocity = new Vec3(vec3d.x / 2.0D - vec3d1.x, this.onGround() ? Math.min(0.4D, vec3d.y / 2.0D + d0) : vec3d.y, vec3d.z / 2.0D - vec3d1.z);
+            Vec3 diff = finalVelocity.subtract(vec3d);
+            io.papermc.paper.event.entity.EntityKnockbackEvent event = CraftEventFactory.callEntityKnockbackEvent((org.bukkit.craftbukkit.entity.CraftLivingEntity) this.getBukkitEntity(), attacker, attacker, cause, d0, diff);
+            // Paper end - knockback events
+            if (event.isCancelled()) {
+                return;
+            }
+
+            this.hasImpulse = true;
+            this.setDeltaMovement(vec3d.add(event.getKnockback().getX(), event.getKnockback().getY(), event.getKnockback().getZ())); // Paper - knockback events
+            // CraftBukkit end
         }
     }
 
@@ -1681,7 +2057,21 @@
 
     public LivingEntity.Fallsounds getFallSounds() {
         return new LivingEntity.Fallsounds(SoundEvents.GENERIC_SMALL_FALL, SoundEvents.GENERIC_BIG_FALL);
+    }
+
+    // CraftBukkit start - Add delegate methods
+    public SoundEvent getHurtSound0(DamageSource damagesource) {
+        return this.getHurtSound(damagesource);
+    }
+
+    public SoundEvent getDeathSound0() {
+        return this.getDeathSound();
+    }
+
+    public SoundEvent getFallDamageSound0(int fallHeight) {
+        return this.getFallDamageSound(fallHeight);
     }
+    // CraftBukkit end
 
     public Optional<BlockPos> getLastClimbablePos() {
         return this.lastClimbablePos;
@@ -1757,9 +2147,14 @@
         int i = this.calculateFallDamage(fallDistance, damageMultiplier);
 
         if (i > 0) {
+            // CraftBukkit start
+            if (!this.hurtServer((ServerLevel) this.level(), damageSource, (float) i)) {
+                return true;
+            }
+            // CraftBukkit end
             this.playSound(this.getFallDamageSound(i), 1.0F, 1.0F);
             this.playBlockFallSound();
-            this.hurt(damageSource, (float) i);
+            // this.damageEntity(damagesource, (float) i); // CraftBukkit - moved up
             return true;
         } else {
             return flag;
@@ -1830,7 +2225,7 @@
 
     protected float getDamageAfterArmorAbsorb(DamageSource source, float amount) {
         if (!source.is(DamageTypeTags.BYPASSES_ARMOR)) {
-            this.hurtArmor(source, amount);
+            // this.hurtArmor(damagesource, f); // CraftBukkit - actuallyHurt(DamageSource, float, EntityDamageEvent) for handle damage
             amount = CombatRules.getDamageAfterAbsorb(this, amount, source, (float) this.getArmorValue(), (float) this.getAttributeValue(Attributes.ARMOR_TOUGHNESS));
         }
 
@@ -1841,7 +2236,8 @@
         if (source.is(DamageTypeTags.BYPASSES_EFFECTS)) {
             return amount;
         } else {
-            if (this.hasEffect(MobEffects.DAMAGE_RESISTANCE) && !source.is(DamageTypeTags.BYPASSES_RESISTANCE)) {
+            // CraftBukkit - Moved to handleEntityDamage(DamageSource, float)
+            if (false && this.hasEffect(MobEffects.DAMAGE_RESISTANCE) && !source.is(DamageTypeTags.BYPASSES_RESISTANCE)) {
                 int i = (this.getEffect(MobEffects.DAMAGE_RESISTANCE).getAmplifier() + 1) * 5;
                 int j = 25 - i;
                 float f1 = amount * (float) j;
@@ -1884,18 +2280,154 @@
         }
     }
 
-    protected void actuallyHurt(ServerLevel world, DamageSource source, float amount) {
-        if (!this.isInvulnerableTo(world, source)) {
-            amount = this.getDamageAfterArmorAbsorb(source, amount);
-            amount = this.getDamageAfterMagicAbsorb(source, amount);
-            float f1 = amount;
+    // CraftBukkit start
+    private EntityDamageEvent handleEntityDamage(final DamageSource damagesource, float f) {
+        float originalDamage = f;
 
-            amount = Math.max(amount - this.getAbsorptionAmount(), 0.0F);
-            this.setAbsorptionAmount(this.getAbsorptionAmount() - (f1 - amount));
-            float f2 = f1 - amount;
+        com.google.common.base.Function<Double, Double> freezing = new com.google.common.base.Function<Double, Double>() {
+            @Override
+            public Double apply(Double f) {
+                if (damagesource.is(DamageTypeTags.IS_FREEZING) && LivingEntity.this.getType().is(EntityTypeTags.FREEZE_HURTS_EXTRA_TYPES)) {
+                    return -(f - (f * 5.0F));
+                }
+                return -0.0;
+            }
+        };
+        float freezingModifier = freezing.apply((double) f).floatValue();
+        f += freezingModifier;
+
+        com.google.common.base.Function<Double, Double> hardHat = new com.google.common.base.Function<Double, Double>() {
+            @Override
+            public Double apply(Double f) {
+                if (damagesource.is(DamageTypeTags.DAMAGES_HELMET) && !LivingEntity.this.getItemBySlot(EquipmentSlot.HEAD).isEmpty()) {
+                    return -(f - (f * 0.75F));
+                }
+                return -0.0;
+            }
+        };
+        float hardHatModifier = hardHat.apply((double) f).floatValue();
+        f += hardHatModifier;
+
+        com.google.common.base.Function<Double, Double> blocking = new com.google.common.base.Function<Double, Double>() {
+            @Override
+            public Double apply(Double f) {
+                return -((LivingEntity.this.isDamageSourceBlocked(damagesource)) ? f : 0.0);
+            }
+        };
+        float blockingModifier = blocking.apply((double) f).floatValue();
+        f += blockingModifier;
+
+        com.google.common.base.Function<Double, Double> armor = new com.google.common.base.Function<Double, Double>() {
+            @Override
+            public Double apply(Double f) {
+                return -(f - LivingEntity.this.getDamageAfterArmorAbsorb(damagesource, f.floatValue()));
+            }
+        };
+        float armorModifier = armor.apply((double) f).floatValue();
+        f += armorModifier;
+
+        com.google.common.base.Function<Double, Double> resistance = new com.google.common.base.Function<Double, Double>() {
+            @Override
+            public Double apply(Double f) {
+                if (!damagesource.is(DamageTypeTags.BYPASSES_EFFECTS) && LivingEntity.this.hasEffect(MobEffects.DAMAGE_RESISTANCE) && !damagesource.is(DamageTypeTags.BYPASSES_RESISTANCE)) {
+                    int i = (LivingEntity.this.getEffect(MobEffects.DAMAGE_RESISTANCE).getAmplifier() + 1) * 5;
+                    int j = 25 - i;
+                    float f1 = f.floatValue() * (float) j;
+
+                    return -(f - Math.max(f1 / 25.0F, 0.0F));
+                }
+                return -0.0;
+            }
+        };
+        float resistanceModifier = resistance.apply((double) f).floatValue();
+        f += resistanceModifier;
+
+        com.google.common.base.Function<Double, Double> magic = new com.google.common.base.Function<Double, Double>() {
+            @Override
+            public Double apply(Double f) {
+                return -(f - LivingEntity.this.getDamageAfterMagicAbsorb(damagesource, f.floatValue()));
+            }
+        };
+        float magicModifier = magic.apply((double) f).floatValue();
+        f += magicModifier;
+
+        com.google.common.base.Function<Double, Double> absorption = new com.google.common.base.Function<Double, Double>() {
+            @Override
+            public Double apply(Double f) {
+                return -(Math.max(f - Math.max(f - LivingEntity.this.getAbsorptionAmount(), 0.0F), 0.0F));
+            }
+        };
+        float absorptionModifier = absorption.apply((double) f).floatValue();
+
+        return CraftEventFactory.handleLivingEntityDamageEvent(this, damagesource, originalDamage, freezingModifier, hardHatModifier, blockingModifier, armorModifier, resistanceModifier, magicModifier, absorptionModifier, freezing, hardHat, blocking, armor, resistance, magic, absorption);
+    }
+
+    protected boolean actuallyHurt(ServerLevel worldserver, final DamageSource damagesource, float f, final EntityDamageEvent event) { // void -> boolean, add final
+        if (!this.isInvulnerableTo(worldserver, damagesource)) {
+            if (event.isCancelled()) {
+                return false;
+            }
+
+            if (damagesource.getEntity() instanceof net.minecraft.world.entity.player.Player) {
+                // Paper start - PlayerAttackEntityCooldownResetEvent
+                //((net.minecraft.world.entity.player.Player) damagesource.getEntity()).resetAttackStrengthTicker(); // Moved from EntityHuman in order to make the cooldown reset get called after the damage event is fired
+                if (damagesource.getEntity() instanceof ServerPlayer) {
+                    ServerPlayer player = (ServerPlayer) damagesource.getEntity();
+                    if (new com.destroystokyo.paper.event.player.PlayerAttackEntityCooldownResetEvent(player.getBukkitEntity(), this.getBukkitEntity(), player.getAttackStrengthScale(0F)).callEvent()) {
+                        player.resetAttackStrengthTicker();
+                    }
+                } else {
+                    ((net.minecraft.world.entity.player.Player) damagesource.getEntity()).resetAttackStrengthTicker();
+                }
+                // Paper end - PlayerAttackEntityCooldownResetEvent
+            }
+
+            // Resistance
+            if (event.getDamage(DamageModifier.RESISTANCE) < 0) {
+                float f3 = (float) -event.getDamage(DamageModifier.RESISTANCE);
+                if (f3 > 0.0F && f3 < 3.4028235E37F) {
+                    if (this instanceof ServerPlayer) {
+                        ((ServerPlayer) this).awardStat(Stats.DAMAGE_RESISTED, Math.round(f3 * 10.0F));
+                    } else if (damagesource.getEntity() instanceof ServerPlayer) {
+                        ((ServerPlayer) damagesource.getEntity()).awardStat(Stats.DAMAGE_DEALT_RESISTED, Math.round(f3 * 10.0F));
+                    }
+                }
+            }
+
+            // Apply damage to helmet
+            if (damagesource.is(DamageTypeTags.DAMAGES_HELMET) && !this.getItemBySlot(EquipmentSlot.HEAD).isEmpty()) {
+                this.hurtHelmet(damagesource, f);
+            }
+
+            // Apply damage to armor
+            if (!damagesource.is(DamageTypeTags.BYPASSES_ARMOR)) {
+                float armorDamage = (float) (event.getDamage() + event.getDamage(DamageModifier.BLOCKING) + event.getDamage(DamageModifier.HARD_HAT));
+                this.hurtArmor(damagesource, armorDamage);
+            }
+
+            // Apply blocking code // PAIL: steal from above
+            if (event.getDamage(DamageModifier.BLOCKING) < 0) {
+                this.hurtCurrentlyUsedShield((float) -event.getDamage(DamageModifier.BLOCKING));
+                Entity entity = damagesource.getDirectEntity();
+
+                if (entity instanceof LivingEntity) {
+                    this.blockUsingShield((LivingEntity) entity);
+                }
+            }
+
+            boolean human = this instanceof net.minecraft.world.entity.player.Player;
+            float originalDamage = (float) event.getDamage();
+            float absorptionModifier = (float) -event.getDamage(DamageModifier.ABSORPTION);
+            this.setAbsorptionAmount(Math.max(this.getAbsorptionAmount() - absorptionModifier, 0.0F));
+            float f2 = absorptionModifier;
 
+            if (f2 > 0.0F && f2 < 3.4028235E37F && this instanceof net.minecraft.world.entity.player.Player) {
+                ((net.minecraft.world.entity.player.Player) this).awardStat(Stats.DAMAGE_ABSORBED, Math.round(f2 * 10.0F));
+            }
+            // CraftBukkit end
+
             if (f2 > 0.0F && f2 < 3.4028235E37F) {
-                Entity entity = source.getEntity();
+                Entity entity = damagesource.getEntity();
 
                 if (entity instanceof ServerPlayer) {
                     ServerPlayer entityplayer = (ServerPlayer) entity;
@@ -1904,13 +2436,48 @@
                 }
             }
 
-            if (amount != 0.0F) {
-                this.getCombatTracker().recordDamage(source, amount);
-                this.setHealth(this.getHealth() - amount);
-                this.setAbsorptionAmount(this.getAbsorptionAmount() - amount);
+            // CraftBukkit start
+            if (f > 0 || !human) {
+                if (human) {
+                    // PAIL: Be sure to drag all this code from the EntityHuman subclass each update.
+                    ((net.minecraft.world.entity.player.Player) this).causeFoodExhaustion(damagesource.getFoodExhaustion(), org.bukkit.event.entity.EntityExhaustionEvent.ExhaustionReason.DAMAGED); // CraftBukkit - EntityExhaustionEvent
+                    if (f < 3.4028235E37F) {
+                        ((net.minecraft.world.entity.player.Player) this).awardStat(Stats.DAMAGE_TAKEN, Math.round(f * 10.0F));
+                    }
+                }
+                // CraftBukkit end
+                this.getCombatTracker().recordDamage(damagesource, f);
+                this.setHealth(this.getHealth() - f);
+                // CraftBukkit start
+                if (!human) {
+                    this.setAbsorptionAmount(this.getAbsorptionAmount() - f);
+                }
                 this.gameEvent(GameEvent.ENTITY_DAMAGE);
+
+                return true;
+            } else {
+                // Duplicate triggers if blocking
+                if (event.getDamage(DamageModifier.BLOCKING) < 0) {
+                    if (this instanceof ServerPlayer) {
+                        CriteriaTriggers.ENTITY_HURT_PLAYER.trigger((ServerPlayer) this, damagesource, f, originalDamage, true);
+                        f2 = (float) -event.getDamage(DamageModifier.BLOCKING);
+                        if (f2 > 0.0F && f2 < 3.4028235E37F) {
+                            ((ServerPlayer) this).awardStat(Stats.DAMAGE_BLOCKED_BY_SHIELD, Math.round(originalDamage * 10.0F));
+                        }
+                    }
+
+                    if (damagesource.getEntity() instanceof ServerPlayer) {
+                        CriteriaTriggers.PLAYER_HURT_ENTITY.trigger((ServerPlayer) damagesource.getEntity(), this, damagesource, f, originalDamage, true);
+                    }
+
+                    return true;
+                } else {
+                    return originalDamage > 0;
+                }
+                // CraftBukkit end
             }
         }
+        return false; // CraftBukkit
     }
 
     public CombatTracker getCombatTracker() {
@@ -1935,9 +2502,19 @@
     }
 
     public final void setArrowCount(int stuckArrowCount) {
-        this.entityData.set(LivingEntity.DATA_ARROW_COUNT_ID, stuckArrowCount);
+        // CraftBukkit start
+        this.setArrowCount(stuckArrowCount, false);
     }
 
+    public final void setArrowCount(int i, boolean flag) {
+        ArrowBodyCountChangeEvent event = CraftEventFactory.callArrowBodyCountChangeEvent(this, this.getArrowCount(), i, flag);
+        if (event.isCancelled()) {
+            return;
+        }
+        this.entityData.set(LivingEntity.DATA_ARROW_COUNT_ID, event.getNewAmount());
+    }
+    // CraftBukkit end
+
     public final int getStingerCount() {
         return (Integer) this.entityData.get(LivingEntity.DATA_STINGER_COUNT_ID);
     }
@@ -1999,7 +2576,7 @@
                     this.playSound(soundeffect, this.getSoundVolume(), (this.random.nextFloat() - this.random.nextFloat()) * 0.2F + 1.0F);
                 }
 
-                if (!(this instanceof Player)) {
+                if (!(this instanceof net.minecraft.world.entity.player.Player)) {
                     this.setHealth(0.0F);
                     this.die(this.damageSources().generic());
                 }
@@ -2182,6 +2759,12 @@
 
     public abstract ItemStack getItemBySlot(EquipmentSlot slot);
 
+    // CraftBukkit start
+    public void setItemSlot(EquipmentSlot enumitemslot, ItemStack itemstack, boolean silent) {
+        this.setItemSlot(enumitemslot, itemstack);
+    }
+    // CraftBukkit end
+
     public abstract void setItemSlot(EquipmentSlot slot, ItemStack stack);
 
     public Iterable<ItemStack> getHandSlots() {
@@ -2292,17 +2875,29 @@
         return this.hasEffect(MobEffects.JUMP) ? 0.1F * ((float) this.getEffect(MobEffects.JUMP).getAmplifier() + 1.0F) : 0.0F;
     }
 
+    protected long lastJumpTime = 0L; // Paper - Prevent excessive velocity through repeated crits
     @VisibleForTesting
     public void jumpFromGround() {
         float f = this.getJumpPower();
 
         if (f > 1.0E-5F) {
             Vec3 vec3d = this.getDeltaMovement();
+            // Paper start - Prevent excessive velocity through repeated crits
+            long time = System.nanoTime();
+            boolean canCrit = true;
+            if (this instanceof net.minecraft.world.entity.player.Player) {
+                canCrit = false;
+                if (time - this.lastJumpTime > (long)(0.250e9)) {
+                    this.lastJumpTime = time;
+                    canCrit = true;
+                }
+            }
+            // Paper end - Prevent excessive velocity through repeated crits
 
             this.setDeltaMovement(vec3d.x, Math.max((double) f, vec3d.y), vec3d.z);
             if (this.isSprinting()) {
                 float f1 = this.getYRot() * 0.017453292F;
-
+                if (canCrit) // Paper - Prevent excessive velocity through repeated crits
                 this.addDeltaMovement(new Vec3((double) (-Mth.sin(f1)) * 0.2D, 0.0D, (double) Mth.cos(f1) * 0.2D));
             }
 
@@ -2494,7 +3089,7 @@
 
     }
 
-    private void travelRidden(Player controllingPlayer, Vec3 movementInput) {
+    private void travelRidden(net.minecraft.world.entity.player.Player controllingPlayer, Vec3 movementInput) {
         Vec3 vec3d1 = this.getRiddenInput(controllingPlayer, movementInput);
 
         this.tickRidden(controllingPlayer, vec3d1);
@@ -2507,13 +3102,13 @@
 
     }
 
-    protected void tickRidden(Player controllingPlayer, Vec3 movementInput) {}
+    protected void tickRidden(net.minecraft.world.entity.player.Player controllingPlayer, Vec3 movementInput) {}
 
-    protected Vec3 getRiddenInput(Player controllingPlayer, Vec3 movementInput) {
+    protected Vec3 getRiddenInput(net.minecraft.world.entity.player.Player controllingPlayer, Vec3 movementInput) {
         return movementInput;
     }
 
-    protected float getRiddenSpeed(Player controllingPlayer) {
+    protected float getRiddenSpeed(net.minecraft.world.entity.player.Player controllingPlayer) {
         return this.getSpeed();
     }
 
@@ -2571,7 +3166,7 @@
             double d1 = Mth.clamp(motion.z, -0.15000000596046448D, 0.15000000596046448D);
             double d2 = Math.max(motion.y, -0.15000000596046448D);
 
-            if (d2 < 0.0D && !this.getInBlockState().is(Blocks.SCAFFOLDING) && this.isSuppressingSlidingDownLadder() && this instanceof Player) {
+            if (d2 < 0.0D && !this.getInBlockState().is(Blocks.SCAFFOLDING) && this.isSuppressingSlidingDownLadder() && this instanceof net.minecraft.world.entity.player.Player) {
                 d2 = 0.0D;
             }
 
@@ -2586,7 +3181,7 @@
     }
 
     protected float getFlyingSpeed() {
-        return this.getControllingPassenger() instanceof Player ? this.getSpeed() * 0.1F : 0.02F;
+        return this.getControllingPassenger() instanceof net.minecraft.world.entity.player.Player ? this.getSpeed() * 0.1F : 0.02F;
     }
 
     public float getSpeed() {
@@ -2634,7 +3229,7 @@
                 }
             }
 
-            this.detectEquipmentUpdates();
+            this.detectEquipmentUpdatesPublic(); // CraftBukkit
             if (this.tickCount % 20 == 0) {
                 this.getCombatTracker().recheckStatus();
             }
@@ -2687,37 +3282,15 @@
         gameprofilerfiller.pop();
         gameprofilerfiller.push("rangeChecks");
 
-        while (this.getYRot() - this.yRotO < -180.0F) {
-            this.yRotO -= 360.0F;
-        }
+        // Paper start - stop large pitch and yaw changes from crashing the server
+        this.yRotO += Math.round((this.getYRot() - this.yRotO) / 360.0F) * 360.0F;
 
-        while (this.getYRot() - this.yRotO >= 180.0F) {
-            this.yRotO += 360.0F;
-        }
+        this.yBodyRotO += Math.round((this.yBodyRot - this.yBodyRotO) / 360.0F) * 360.0F;
 
-        while (this.yBodyRot - this.yBodyRotO < -180.0F) {
-            this.yBodyRotO -= 360.0F;
-        }
+        this.xRotO += Math.round((this.getXRot() - this.xRotO) / 360.0F) * 360.0F;
 
-        while (this.yBodyRot - this.yBodyRotO >= 180.0F) {
-            this.yBodyRotO += 360.0F;
-        }
-
-        while (this.getXRot() - this.xRotO < -180.0F) {
-            this.xRotO -= 360.0F;
-        }
-
-        while (this.getXRot() - this.xRotO >= 180.0F) {
-            this.xRotO += 360.0F;
-        }
-
-        while (this.yHeadRot - this.yHeadRotO < -180.0F) {
-            this.yHeadRotO -= 360.0F;
-        }
-
-        while (this.yHeadRot - this.yHeadRotO >= 180.0F) {
-            this.yHeadRotO += 360.0F;
-        }
+        this.yHeadRotO += Math.round((this.yHeadRot - this.yHeadRotO) / 360.0F) * 360.0F;
+        // Paper end
 
         gameprofilerfiller.pop();
         this.animStep += f2;
@@ -2741,7 +3314,7 @@
         this.elytraAnimationState.tick();
     }
 
-    public void detectEquipmentUpdates() {
+    public void detectEquipmentUpdatesPublic() { // CraftBukkit
         Map<EquipmentSlot, ItemStack> map = this.collectEquipmentChanges();
 
         if (map != null) {
@@ -2778,10 +3351,17 @@
                     throw new MatchException((String) null, (Throwable) null);
             }
 
-            ItemStack itemstack2 = itemstack1;
+            ItemStack itemstack2 = itemstack1; final ItemStack oldEquipment = itemstack2; // Paper - PlayerArmorChangeEvent - obfhelper 
 
-            itemstack = this.getItemBySlot(enumitemslot);
+            itemstack = this.getItemBySlot(enumitemslot); final ItemStack newEquipment = itemstack;// Paper - PlayerArmorChangeEvent - obfhelper
             if (this.equipmentHasChanged(itemstack2, itemstack)) {
+                // Paper start - PlayerArmorChangeEvent
+                if (this instanceof ServerPlayer && enumitemslot.getType() == EquipmentSlot.Type.HUMANOID_ARMOR) {
+                    final org.bukkit.inventory.ItemStack oldItem = CraftItemStack.asBukkitCopy(oldEquipment);
+                    final org.bukkit.inventory.ItemStack newItem = CraftItemStack.asBukkitCopy(newEquipment);
+                    new com.destroystokyo.paper.event.player.PlayerArmorChangeEvent((Player) this.getBukkitEntity(), com.destroystokyo.paper.event.player.PlayerArmorChangeEvent.SlotType.valueOf(enumitemslot.name()), oldItem, newItem).callEvent();
+                }
+                // Paper end - PlayerArmorChangeEvent
                 if (map == null) {
                     map = Maps.newEnumMap(EquipmentSlot.class);
                 }
@@ -2974,8 +3554,10 @@
             } else if (this.isInLava() && (!this.onGround() || d3 > d4)) {
                 this.jumpInLiquid(FluidTags.LAVA);
             } else if ((this.onGround() || flag && d3 <= d4) && this.noJumpDelay == 0) {
+                if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper - Entity Jump API
                 this.jumpFromGround();
                 this.noJumpDelay = 10;
+                } else { this.setJumping(false); } // Paper - Entity Jump API; setJumping(false) stops a potential loop
             }
         } else {
             this.noJumpDelay = 0;
@@ -3000,7 +3582,7 @@
         {
             LivingEntity entityliving = this.getControllingPassenger();
 
-            if (entityliving instanceof Player entityhuman) {
+            if (entityliving instanceof net.minecraft.world.entity.player.Player entityhuman) {
                 if (this.isAlive()) {
                     this.travelRidden(entityhuman, vec3d1);
                     break label112;
@@ -3017,7 +3599,7 @@
         this.calculateEntityAnimation(this instanceof FlyingAnimal);
         gameprofilerfiller.pop();
         gameprofilerfiller.push("freezing");
-        if (!this.level().isClientSide && !this.isDeadOrDying()) {
+        if (!this.level().isClientSide && !this.isDeadOrDying() && !this.freezeLocked) { // Paper - Freeze Tick Lock API
             int i = this.getTicksFrozen();
 
             if (this.isInPowderSnow && this.canFreeze()) {
@@ -3046,6 +3628,20 @@
 
         this.pushEntities();
         gameprofilerfiller.pop();
+        // Paper start - Add EntityMoveEvent
+        if (((ServerLevel) this.level()).hasEntityMoveEvent && !(this instanceof net.minecraft.world.entity.player.Player)) {
+            if (this.xo != this.getX() || this.yo != this.getY() || this.zo != this.getZ() || this.yRotO != this.getYRot() || this.xRotO != this.getXRot()) {
+                Location from = new Location(this.level().getWorld(), this.xo, this.yo, this.zo, this.yRotO, this.xRotO);
+                Location to = new Location(this.level().getWorld(), this.getX(), this.getY(), this.getZ(), this.getYRot(), this.getXRot());
+                io.papermc.paper.event.entity.EntityMoveEvent event = new io.papermc.paper.event.entity.EntityMoveEvent(this.getBukkitLivingEntity(), from, to.clone());
+                if (!event.callEvent()) {
+                    this.absMoveTo(from.getX(), from.getY(), from.getZ(), from.getYaw(), from.getPitch());
+                } else if (!to.equals(event.getTo())) {
+                    this.absMoveTo(event.getTo().getX(), event.getTo().getY(), event.getTo().getZ(), event.getTo().getYaw(), event.getTo().getPitch());
+                }
+            }
+        }
+        // Paper end - Add EntityMoveEvent
         world = this.level();
         if (world instanceof ServerLevel worldserver) {
             if (this.isSensitiveToWater() && this.isInWaterRainOrBubble()) {
@@ -3063,6 +3659,7 @@
         this.checkSlowFallDistance();
         if (!this.level().isClientSide) {
             if (!this.canGlide()) {
+                if (this.getSharedFlag(7) != false && !CraftEventFactory.callToggleGlideEvent(this, false).isCancelled()) // CraftBukkit
                 this.setSharedFlag(7, false);
                 return;
             }
@@ -3113,12 +3710,26 @@
         Level world = this.level();
 
         if (!(world instanceof ServerLevel worldserver)) {
-            this.level().getEntities(EntityTypeTest.forClass(Player.class), this.getBoundingBox(), EntitySelector.pushableBy(this)).forEach(this::doPush);
+            this.level().getEntities(EntityTypeTest.forClass(net.minecraft.world.entity.player.Player.class), this.getBoundingBox(), EntitySelector.pushableBy(this)).forEach(this::doPush);
         } else {
-            List list = this.level().getEntities((Entity) this, this.getBoundingBox(), EntitySelector.pushableBy(this));
+            // Paper start - don't run getEntities if we're not going to use its result
+            if (!this.isPushable()) {
+                return;
+            }
+            net.minecraft.world.scores.Team team = this.getTeam();
+            if (team != null && team.getCollisionRule() == net.minecraft.world.scores.Team.CollisionRule.NEVER) {
+                return;
+            }
 
+            int i = worldserver.getGameRules().getInt(GameRules.RULE_MAX_ENTITY_CRAMMING);
+            if (i <= 0 && this.level().paperConfig().collisions.maxEntityCollisions <= 0) {
+                return;
+            }
+            // Paper end - don't run getEntities if we're not going to use its result
+            List list = this.level().getEntities((Entity) this, this.getBoundingBox(), EntitySelector.pushable(this, this.level().paperConfig().collisions.fixClimbingBypassingCrammingRule)); // Paper - Climbing should not bypass cramming gamerule
+
             if (!list.isEmpty()) {
-                int i = worldserver.getGameRules().getInt(GameRules.RULE_MAX_ENTITY_CRAMMING);
+                // Paper - don't run getEntities if we're not going to use its result; moved up
 
                 if (i > 0 && list.size() > i - 1 && this.random.nextInt(4) == 0) {
                     int j = 0;
@@ -3138,10 +3749,12 @@
                 }
 
                 Iterator iterator1 = list.iterator();
+                this.numCollisions = Math.max(0, this.numCollisions - this.level().paperConfig().collisions.maxEntityCollisions); // Paper - Cap entity collisions
 
-                while (iterator1.hasNext()) {
+                while (iterator1.hasNext() && this.numCollisions < this.level().paperConfig().collisions.maxEntityCollisions) { // Paper - Cap entity collisions
                     Entity entity1 = (Entity) iterator1.next();
-
+                    entity1.numCollisions++; // Paper - Cap entity collisions
+                    this.numCollisions++; // Paper - Cap entity collisions
                     this.doPush(entity1);
                 }
             }
@@ -3190,10 +3803,16 @@
 
     @Override
     public void stopRiding() {
+        // Paper start - Force entity dismount during teleportation
+        this.stopRiding(false);
+    }
+    @Override
+    public void stopRiding(boolean suppressCancellation) {
+        // Paper end - Force entity dismount during teleportation
         Entity entity = this.getVehicle();
 
-        super.stopRiding();
-        if (entity != null && entity != this.getVehicle() && !this.level().isClientSide) {
+        super.stopRiding(suppressCancellation); // Paper - Force entity dismount during teleportation
+        if (entity != null && entity != this.getVehicle() && !this.level().isClientSide && entity.valid) { // Paper - don't process on world gen
             this.dismountVehicle(entity);
         }
 
@@ -3284,7 +3903,8 @@
             Vec3 vec3d = new Vec3(this.getX(), this.getEyeY(), this.getZ());
             Vec3 vec3d1 = new Vec3(entity.getX(), entityY, entity.getZ());
 
-            return vec3d1.distanceTo(vec3d) > 128.0D ? false : this.level().clip(new ClipContext(vec3d, vec3d1, shapeType, fluidHandling, this)).getType() == HitResult.Type.MISS;
+            // Paper - diff on change - used in CraftLivingEntity#hasLineOfSight(Location) and CraftWorld#lineOfSightExists
+            return vec3d1.distanceToSqr(vec3d) > 128.0D * 128.0D ? false : this.level().clip(new ClipContext(vec3d, vec3d1, shapeType, fluidHandling, this)).getType() == HitResult.Type.MISS; // Paper - Perf: Use distance squared
         }
     }
 
@@ -3305,15 +3925,29 @@
 
     @Override
     public boolean isPickable() {
-        return !this.isRemoved();
+        return !this.isRemoved() && this.collides; // CraftBukkit
     }
 
+    // Paper start - Climbing should not bypass cramming gamerule
     @Override
     public boolean isPushable() {
-        return this.isAlive() && !this.isSpectator() && !this.onClimbable();
+        return this.isCollidable(this.level().paperConfig().collisions.fixClimbingBypassingCrammingRule);
     }
 
     @Override
+    public boolean isCollidable(boolean ignoreClimbing) {
+        return this.isAlive() && !this.isSpectator() && (ignoreClimbing || !this.onClimbable()) && this.collides; // CraftBukkit
+        // Paper end - Climbing should not bypass cramming gamerule
+    }
+
+    // CraftBukkit start - collidable API
+    @Override
+    public boolean canCollideWithBukkit(Entity entity) {
+        return this.isPushable() && this.collides != this.collidableExemptions.contains(entity.getUUID());
+    }
+    // CraftBukkit end
+
+    @Override
     public float getYHeadRot() {
         return this.yHeadRot;
     }
@@ -3342,7 +3976,7 @@
     }
 
     public final void setAbsorptionAmount(float absorptionAmount) {
-        this.internalSetAbsorptionAmount(Mth.clamp(absorptionAmount, 0.0F, this.getMaxAbsorption()));
+        this.internalSetAbsorptionAmount(!Float.isNaN(absorptionAmount) ? Mth.clamp(absorptionAmount, 0.0F, this.getMaxAbsorption()) : 0.0F); // Paper - Check for NaN
     }
 
     protected void internalSetAbsorptionAmount(float absorptionAmount) {
@@ -3410,9 +4044,14 @@
     }
 
     public void startUsingItem(InteractionHand hand) {
+        // Paper start - Prevent consuming the wrong itemstack
+        this.startUsingItem(hand, false);
+    }
+    public void startUsingItem(InteractionHand hand, boolean forceUpdate) {
+        // Paper end - Prevent consuming the wrong itemstack
         ItemStack itemstack = this.getItemInHand(hand);
 
-        if (!itemstack.isEmpty() && !this.isUsingItem()) {
+        if (!itemstack.isEmpty() && !this.isUsingItem() || forceUpdate) { // Paper - Prevent consuming the wrong itemstack
             this.useItem = itemstack;
             this.useItemRemaining = itemstack.getUseDuration(this);
             if (!this.level().isClientSide) {
@@ -3483,13 +4122,50 @@
                 this.releaseUsingItem();
             } else {
                 if (!this.useItem.isEmpty() && this.isUsingItem()) {
-                    ItemStack itemstack = this.useItem.finishUsingItem(this.level(), this);
+                    this.startUsingItem(this.getUsedItemHand(), true); // Paper - Prevent consuming the wrong itemstack
+                    // CraftBukkit start - fire PlayerItemConsumeEvent
+                    ItemStack itemstack;
+                    PlayerItemConsumeEvent event = null; // Paper
+                    if (this instanceof ServerPlayer entityPlayer) {
+                        org.bukkit.inventory.ItemStack craftItem = CraftItemStack.asBukkitCopy(this.useItem);
+                        org.bukkit.inventory.EquipmentSlot hand = org.bukkit.craftbukkit.CraftEquipmentSlot.getHand(enumhand);
+                        event = new PlayerItemConsumeEvent((Player) this.getBukkitEntity(), craftItem, hand); // Paper
+                        this.level().getCraftServer().getPluginManager().callEvent(event);
 
+                        if (event.isCancelled()) {
+                            // Update client
+                            Consumable consumable = this.useItem.get(DataComponents.CONSUMABLE);
+                            if (consumable != null) {
+                                consumable.cancelUsingItem(entityPlayer, this.useItem);
+                            }
+                            entityPlayer.getBukkitEntity().updateInventory();
+                            entityPlayer.getBukkitEntity().updateScaledHealth();
+                            this.stopUsingItem(); // Paper - event is using an item, clear active item to reset its use
+                            return;
+                        }
+
+                        itemstack = (craftItem.equals(event.getItem())) ? this.useItem.finishUsingItem(this.level(), this) : CraftItemStack.asNMSCopy(event.getItem()).finishUsingItem(this.level(), this);
+                    } else {
+                        itemstack = this.useItem.finishUsingItem(this.level(), this);
+                    }
+                    // Paper start - save the default replacement item and change it if necessary
+                    final ItemStack defaultReplacement = itemstack;
+                    if (event != null && event.getReplacement() != null) {
+                        itemstack = CraftItemStack.asNMSCopy(event.getReplacement());
+                    }
+                    // Paper end
+                    // CraftBukkit end
+
                     if (itemstack != this.useItem) {
                         this.setItemInHand(enumhand, itemstack);
                     }
 
                     this.stopUsingItem();
+                    // Paper start
+                    if (this instanceof ServerPlayer) {
+                        ((ServerPlayer) this).getBukkitEntity().updateInventory();
+                    }
+                    // Paper end
                 }
 
             }
@@ -3512,6 +4188,7 @@
 
     public void releaseUsingItem() {
         if (!this.useItem.isEmpty()) {
+            if (this instanceof ServerPlayer) new io.papermc.paper.event.player.PlayerStopUsingItemEvent((Player) getBukkitEntity(), useItem.asBukkitMirror(), getTicksUsingItem()).callEvent(); // Paper - Add PlayerStopUsingItemEvent
             this.useItem.releaseUsing(this.level(), this, this.getUseItemRemainingTicks());
             if (this.useItem.useOnRelease()) {
                 this.updatingUsingItem();
@@ -3544,11 +4221,68 @@
         if (this.isUsingItem() && !this.useItem.isEmpty()) {
             Item item = this.useItem.getItem();
 
-            return item.getUseAnimation(this.useItem) != ItemUseAnimation.BLOCK ? null : (item.getUseDuration(this.useItem, this) - this.useItemRemaining < 5 ? null : this.useItem);
+            return item.getUseAnimation(this.useItem) != ItemUseAnimation.BLOCK ? null : (item.getUseDuration(this.useItem, this) - this.useItemRemaining < getShieldBlockingDelay() ? null : this.useItem); // Paper - Make shield blocking delay configurable
         } else {
             return null;
         }
+    }
+
+    // Paper start - Make shield blocking delay configurable
+    public HitResult getRayTrace(int maxDistance, ClipContext.Fluid fluidCollisionOption) {
+        if (maxDistance < 1 || maxDistance > 120) {
+            throw new IllegalArgumentException("maxDistance must be between 1-120");
+        }
+
+        Vec3 start = new Vec3(getX(), getY() + getEyeHeight(), getZ());
+        org.bukkit.util.Vector dir = getBukkitEntity().getLocation().getDirection().multiply(maxDistance);
+        Vec3 end = new Vec3(start.x + dir.getX(), start.y + dir.getY(), start.z + dir.getZ());
+        ClipContext raytrace = new ClipContext(start, end, ClipContext.Block.OUTLINE, fluidCollisionOption, this);
+
+        return this.level().clip(raytrace);
+    }
+
+    public @Nullable net.minecraft.world.phys.EntityHitResult getTargetEntity(int maxDistance) {
+        if (maxDistance < 1 || maxDistance > 120) {
+            throw new IllegalArgumentException("maxDistance must be between 1-120");
+        }
+
+        Vec3 start = this.getEyePosition(1.0F);
+        Vec3 direction = this.getLookAngle();
+        Vec3 end = start.add(direction.x * maxDistance, direction.y * maxDistance, direction.z * maxDistance);
+
+        List<Entity> entityList = this.level().getEntities(this, getBoundingBox().expandTowards(direction.x * maxDistance, direction.y * maxDistance, direction.z * maxDistance).inflate(1.0D, 1.0D, 1.0D), EntitySelector.NO_SPECTATORS.and(Entity::isPickable));
+
+        double distance = 0.0D;
+        net.minecraft.world.phys.EntityHitResult result = null;
+
+        for (Entity entity : entityList) {
+            final double inflationAmount = (double) entity.getPickRadius();
+            AABB aabb = entity.getBoundingBox().inflate(inflationAmount, inflationAmount, inflationAmount);
+            Optional<Vec3> rayTraceResult = aabb.clip(start, end);
+
+            if (rayTraceResult.isPresent()) {
+                Vec3 rayTrace = rayTraceResult.get();
+                double distanceTo = start.distanceToSqr(rayTrace);
+                if (distanceTo < distance || distance == 0.0D) {
+                    result = new net.minecraft.world.phys.EntityHitResult(entity, rayTrace);
+                    distance = distanceTo;
+                }
+            }
+        }
+
+        return result;
+    }
+
+    public int shieldBlockingDelay = this.level().paperConfig().misc.shieldBlockingDelay;
+
+    public int getShieldBlockingDelay() {
+        return shieldBlockingDelay;
+    }
+
+    public void setShieldBlockingDelay(int shieldBlockingDelay) {
+        this.shieldBlockingDelay = shieldBlockingDelay;
     }
+    // Paper end - Make shield blocking delay configurable
 
     public boolean isSuppressingSlidingDownLadder() {
         return this.isShiftKeyDown();
@@ -3568,12 +4302,18 @@
     }
 
     public boolean randomTeleport(double x, double y, double z, boolean particleEffects) {
+        // CraftBukkit start
+        return this.randomTeleport(x, y, z, particleEffects, org.bukkit.event.player.PlayerTeleportEvent.TeleportCause.UNKNOWN).orElse(false);
+    }
+
+    public Optional<Boolean> randomTeleport(double d0, double d1, double d2, boolean flag, org.bukkit.event.player.PlayerTeleportEvent.TeleportCause cause) {
+        // CraftBukkit end
         double d3 = this.getX();
         double d4 = this.getY();
         double d5 = this.getZ();
-        double d6 = y;
+        double d6 = d1;
         boolean flag1 = false;
-        BlockPos blockposition = BlockPos.containing(x, y, z);
+        BlockPos blockposition = BlockPos.containing(d0, d1, d2);
         Level world = this.level();
 
         if (world.hasChunkAt(blockposition)) {
@@ -3592,18 +4332,43 @@
             }
 
             if (flag2) {
-                this.teleportTo(x, d6, z);
+                // CraftBukkit start - Teleport event
+                // this.teleportTo(d0, d6, d2);
+
+                // first set position, to check if the place to teleport is valid
+                this.setPos(d0, d6, d2);
                 if (world.noCollision((Entity) this) && !world.containsAnyLiquid(this.getBoundingBox())) {
                     flag1 = true;
+                }
+                // now revert and call event if the teleport place is valid
+                this.setPos(d3, d4, d5);
+
+                if (flag1) {
+                    if (!(this instanceof ServerPlayer)) {
+                        EntityTeleportEvent teleport = new EntityTeleportEvent(this.getBukkitEntity(), new Location(this.level().getWorld(), d3, d4, d5), new Location(this.level().getWorld(), d0, d6, d2));
+                        this.level().getCraftServer().getPluginManager().callEvent(teleport);
+                        if (!teleport.isCancelled()) {
+                            Location to = teleport.getTo();
+                            this.teleportTo(to.getX(), to.getY(), to.getZ());
+                        } else {
+                            return Optional.empty();
+                        }
+                    } else {
+                        // player teleport event is called in the underlining code
+                        if (!((ServerPlayer) this).connection.teleport(d0, d6, d2, this.getYRot(), this.getXRot(), cause)) {
+                            return Optional.empty();
+                        }
+                    }
                 }
+                // CraftBukkit end
             }
         }
 
         if (!flag1) {
-            this.teleportTo(d3, d4, d5);
-            return false;
+            // this.enderTeleportTo(d3, d4, d5); // CraftBukkit - already set the location back
+            return Optional.of(false); // CraftBukkit
         } else {
-            if (particleEffects) {
+            if (flag) {
                 world.broadcastEntityEvent(this, (byte) 46);
             }
 
@@ -3613,7 +4378,7 @@
                 entitycreature.getNavigation().stop();
             }
 
-            return true;
+            return Optional.of(true); // CraftBukkit
         }
     }
 
@@ -3706,7 +4471,7 @@
     }
 
     public void stopSleeping() {
-        Optional optional = this.getSleepingPos();
+        Optional<BlockPos> optional = this.getSleepingPos(); // CraftBukkit - decompile error
         Level world = this.level();
 
         java.util.Objects.requireNonNull(world);
@@ -3718,9 +4483,9 @@
 
                 this.level().setBlock(blockposition, (BlockState) iblockdata.setValue(BedBlock.OCCUPIED, false), 3);
                 Vec3 vec3d = (Vec3) BedBlock.findStandUpPosition(this.getType(), this.level(), blockposition, enumdirection, this.getYRot()).orElseGet(() -> {
-                    BlockPosition blockposition1 = blockposition.above();
+                    BlockPos blockposition1 = blockposition.above();
 
-                    return new Vec3D((double) blockposition1.getX() + 0.5D, (double) blockposition1.getY() + 0.1D, (double) blockposition1.getZ() + 0.5D);
+                    return new Vec3((double) blockposition1.getX() + 0.5D, (double) blockposition1.getY() + 0.1D, (double) blockposition1.getZ() + 0.5D);
                 });
                 Vec3 vec3d1 = Vec3.atBottomCenterOf(blockposition).subtract(vec3d).normalize();
                 float f = (float) Mth.wrapDegrees(Mth.atan2(vec3d1.z, vec3d1.x) * 57.2957763671875D - 90.0D);
@@ -3740,7 +4505,7 @@
 
     @Nullable
     public Direction getBedOrientation() {
-        BlockPos blockposition = (BlockPos) this.getSleepingPos().orElse((Object) null);
+        BlockPos blockposition = (BlockPos) this.getSleepingPos().orElse(null); // CraftBukkit - decompile error
 
         return blockposition != null ? BedBlock.getBedOrientation(this.level(), blockposition) : null;
     }
@@ -3905,7 +4670,7 @@
     public float maxUpStep() {
         float f = (float) this.getAttributeValue(Attributes.STEP_HEIGHT);
 
-        return this.getControllingPassenger() instanceof Player ? Math.max(f, 1.0F) : f;
+        return this.getControllingPassenger() instanceof net.minecraft.world.entity.player.Player ? Math.max(f, 1.0F) : f;
     }
 
     @Override