PaperMC/Spigot-Server-Patches/0010-Adventure.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Riley Park <riley.park@meino.net>
Date: Fri, 29 Jan 2021 17:54:03 +0100
Subject: [PATCH] Adventure

Co-authored-by: zml <zml@stellardrift.ca>
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>

diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 1d03a79e9010bc514b72a81ba0ad4a62aeff1bb7..429b74474ced04d8dd8f038b8590b8dfe178bf4d 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -217,4 +217,9 @@ public class PaperConfig {
                 " - Length: " + timeSummary(Timings.getHistoryLength() / 20) +
                 " - Server Name: " + timingsServerName);
     }
+
+    public static boolean useDisplayNameInQuit = false;
+    private static void useDisplayNameInQuit() {
+        useDisplayNameInQuit = getBoolean("use-display-name-in-quit-message", useDisplayNameInQuit);
+    }
 }
diff --git a/src/main/java/io/papermc/paper/adventure/AdventureComponent.java b/src/main/java/io/papermc/paper/adventure/AdventureComponent.java
new file mode 100644
index 0000000000000000000000000000000000000000..89597b4a3064c3c6001c7e927a848ee73a1b1fd9
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/AdventureComponent.java
@@ -0,0 +1,77 @@
+package io.papermc.paper.adventure;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.Type;
+import java.util.List;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.TextComponent;
+import net.minecraft.network.chat.ChatModifier;
+import net.minecraft.network.chat.IChatBaseComponent;
+import net.minecraft.network.chat.IChatMutableComponent;
+import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class AdventureComponent implements IChatBaseComponent {
+    final Component wrapped;
+    private @MonotonicNonNull IChatBaseComponent converted;
+
+    public AdventureComponent(final Component wrapped) {
+        this.wrapped = wrapped;
+    }
+
+    public IChatBaseComponent deepConverted() {
+        IChatBaseComponent converted = this.converted;
+        if (converted == null) {
+            converted = PaperAdventure.WRAPPER_AWARE_SERIALIZER.serialize(this.wrapped);
+            this.converted = converted;
+        }
+        return converted;
+    }
+
+    public @Nullable IChatBaseComponent deepConvertedIfPresent() {
+        return this.converted;
+    }
+
+    @Override
+    public ChatModifier getChatModifier() {
+        return this.deepConverted().getChatModifier();
+    }
+
+    @Override
+    public String getText() {
+        if (this.wrapped instanceof TextComponent) {
+            return ((TextComponent) this.wrapped).content();
+        } else {
+            return this.deepConverted().getText();
+        }
+    }
+
+    @Override
+    public String getString() {
+        return PaperAdventure.PLAIN.serialize(this.wrapped);
+    }
+
+    @Override
+    public List<IChatBaseComponent> getSiblings() {
+        return this.deepConverted().getSiblings();
+    }
+
+    @Override
+    public IChatMutableComponent g() {
+        return this.deepConverted().g();
+    }
+
+    @Override
+    public IChatMutableComponent mutableCopy() {
+        return this.deepConverted().mutableCopy();
+    }
+
+    public static class Serializer implements JsonSerializer<AdventureComponent> {
+        @Override
+        public JsonElement serialize(final AdventureComponent src, final Type type, final JsonSerializationContext context) {
+            return PaperAdventure.GSON.serializer().toJsonTree(src.wrapped, Component.class);
+        }
+    }
+}
diff --git a/src/main/java/io/papermc/paper/adventure/ChatProcessor.java b/src/main/java/io/papermc/paper/adventure/ChatProcessor.java
new file mode 100644
index 0000000000000000000000000000000000000000..e7ca0a44919ad052fa2ef279b4cd8989f8969a20
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/ChatProcessor.java
@@ -0,0 +1,213 @@
+package io.papermc.paper.adventure;
+
+import io.papermc.paper.chat.ChatRenderer;
+import io.papermc.paper.event.player.AbstractChatEvent;
+import io.papermc.paper.event.player.AsyncChatEvent;
+import io.papermc.paper.event.player.ChatEvent;
+import java.util.Set;
+import java.util.concurrent.ExecutionException;
+import java.util.function.Consumer;
+import java.util.regex.Pattern;
+
+import net.kyori.adventure.audience.Audience;
+import net.kyori.adventure.audience.MessageType;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.TextReplacementConfig;
+import net.kyori.adventure.text.event.ClickEvent;
+import net.minecraft.network.chat.IChatBaseComponent;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.EntityPlayer;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.craftbukkit.util.LazyPlayerSet;
+import org.bukkit.craftbukkit.util.Waitable;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.AsyncPlayerChatEvent;
+import org.bukkit.event.player.PlayerChatEvent;
+
+public final class ChatProcessor {
+    // <-- copied from adventure-text-serializer-legacy
+    private static final Pattern DEFAULT_URL_PATTERN = Pattern.compile("(?:(https?)://)?([-\\w_.]+\\.\\w{2,})(/\\S*)?");
+    private static final Pattern URL_SCHEME_PATTERN = Pattern.compile("^[a-z][a-z0-9+\\-.]*:");
+    private static final TextReplacementConfig URL_REPLACEMENT_CONFIG = TextReplacementConfig.builder()
+        .match(DEFAULT_URL_PATTERN)
+        .replacement(url -> {
+            String clickUrl = url.content();
+            if (!URL_SCHEME_PATTERN.matcher(clickUrl).find()) {
+                clickUrl = "http://" + clickUrl;
+            }
+            return url.clickEvent(ClickEvent.openUrl(clickUrl));
+        })
+        .build();
+    // copied from adventure-text-serializer-legacy -->
+    final MinecraftServer server;
+    final EntityPlayer player;
+    final String message;
+    final boolean async;
+
+    public ChatProcessor(final MinecraftServer server, final EntityPlayer player, final String message, final boolean async) {
+        this.server = server;
+        this.player = player;
+        this.message = message;
+        this.async = async;
+    }
+
+    @SuppressWarnings({"CodeBlock2Expr", "deprecated"})
+    public void process() {
+        this.processingLegacyFirst(
+            // continuing from AsyncPlayerChatEvent (without PlayerChatEvent)
+            event -> {
+                this.processModern(
+                    legacyRenderer(event.getFormat()),
+                    event.getRecipients(),
+                    PaperAdventure.LEGACY_SECTION_UXRC.deserialize(event.getMessage()),
+                    event.isCancelled()
+                );
+            },
+            // continuing from AsyncPlayerChatEvent and PlayerChatEvent
+            event -> {
+                this.processModern(
+                    legacyRenderer(event.getFormat()),
+                    event.getRecipients(),
+                    PaperAdventure.LEGACY_SECTION_UXRC.deserialize(event.getMessage()),
+                    event.isCancelled()
+                );
+            },
+            // no legacy events called, all nice and fresh!
+            () -> {
+                this.processModern(
+                    ChatRenderer.defaultRenderer(),
+                    new LazyPlayerSet(this.server),
+                    Component.text(this.message).replaceText(URL_REPLACEMENT_CONFIG),
+                    false
+                );
+            }
+        );
+    }
+
+    @SuppressWarnings("deprecation")
+    private void processingLegacyFirst(
+        final Consumer<AsyncPlayerChatEvent> continueAfterAsync,
+        final Consumer<PlayerChatEvent> continueAfterAsyncAndSync,
+        final Runnable modernOnly
+    ) {
+        final boolean listenersOnAsyncEvent = anyListeners(AsyncPlayerChatEvent.getHandlerList());
+        final boolean listenersOnSyncEvent = anyListeners(PlayerChatEvent.getHandlerList());
+        if (listenersOnAsyncEvent || listenersOnSyncEvent) {
+            final CraftPlayer player = this.player.getBukkitEntity();
+            final AsyncPlayerChatEvent ae = new AsyncPlayerChatEvent(this.async, player, this.message, new LazyPlayerSet(this.server));
+            post(ae);
+            if (listenersOnSyncEvent) {
+                final PlayerChatEvent se = new PlayerChatEvent(player, ae.getMessage(), ae.getFormat(), ae.getRecipients());
+                se.setCancelled(ae.isCancelled()); // propagate cancelled state
+                this.queueIfAsyncOrRunImmediately(new Waitable<Void>() {
+                    @Override
+                    protected Void evaluate() {
+                        post(se);
+                        return null;
+                    }
+                });
+                continueAfterAsyncAndSync.accept(se);
+            } else {
+                continueAfterAsync.accept(ae);
+            }
+        } else {
+            modernOnly.run();
+        }
+    }
+
+    private void processModern(final ChatRenderer renderer, final Set<Player> recipients, final Component message, final boolean cancelled) {
+        final AsyncChatEvent ae = this.createAsync(renderer, recipients, new LazyChatAudienceSet(), message);
+        ae.setCancelled(cancelled); // propagate cancelled state
+        post(ae);
+        final boolean listenersOnSyncEvent = anyListeners(ChatEvent.getHandlerList());
+        if (listenersOnSyncEvent) {
+            this.continueWithSyncFromWhereAsyncLeftOff(ae);
+        } else {
+            this.complete(ae);
+        }
+    }
+
+    private void continueWithSyncFromWhereAsyncLeftOff(final AsyncChatEvent ae) {
+        this.queueIfAsyncOrRunImmediately(new Waitable<Void>() {
+            @Override
+            protected Void evaluate() {
+                final ChatEvent se = ChatProcessor.this.createSync(ae.renderer(), ae.recipients(), ae.viewers(), ae.message());
+                se.setCancelled(ae.isCancelled()); // propagate cancelled state
+                post(se);
+                ChatProcessor.this.complete(se);
+                return null;
+            }
+        });
+    }
+
+    private void complete(final AbstractChatEvent event) {
+        if (event.isCancelled()) {
+            return;
+        }
+
+        final CraftPlayer player = this.player.getBukkitEntity();
+        final Component displayName = displayName(player);
+        final Component message = event.message();
+        final ChatRenderer renderer = event.renderer();
+
+        final Set<Audience> viewers = event.viewers();
+        final Set<Player> recipients = event.recipients();
+        if (viewers instanceof LazyChatAudienceSet && recipients instanceof LazyPlayerSet &&
+            (!((LazyChatAudienceSet) viewers).isLazy() || ((LazyPlayerSet) recipients).isLazy())) {
+            for (final Audience viewer : viewers) {
+                viewer.sendMessage(player, renderer.render(player, displayName, message, viewer), MessageType.CHAT);
+            }
+        } else {
+            this.server.console.sendMessage(player, renderer.render(player, displayName, message, this.server.console), MessageType.CHAT);
+            for (final Player recipient : recipients) {
+                recipient.sendMessage(player, renderer.render(player, displayName, message, recipient), MessageType.CHAT);
+            }
+        }
+    }
+
+    private AsyncChatEvent createAsync(final ChatRenderer renderer, final Set<Player> recipients, final Set<Audience> viewers, final Component message) {
+        return new AsyncChatEvent(this.async, this.player.getBukkitEntity(), recipients, viewers, renderer, message);
+    }
+
+    private ChatEvent createSync(final ChatRenderer renderer, final Set<Player> recipients, final Set<Audience> viewers, final Component message) {
+        return new ChatEvent(this.player.getBukkitEntity(), recipients, viewers, renderer, message);
+    }
+
+    private static String legacyDisplayName(final CraftPlayer player) {
+        return player.getDisplayName();
+    }
+
+    private static Component displayName(final CraftPlayer player) {
+        return player.displayName();
+    }
+
+    private static ChatRenderer legacyRenderer(final String format) {
+        return (player, displayName, message, recipient) -> PaperAdventure.LEGACY_SECTION_UXRC.deserialize(String.format(format, legacyDisplayName((CraftPlayer) player), PaperAdventure.LEGACY_SECTION_UXRC.serialize(message))).replaceText(URL_REPLACEMENT_CONFIG);
+    }
+
+    private void queueIfAsyncOrRunImmediately(final Waitable<Void> waitable) {
+        if (this.async) {
+            this.server.processQueue.add(waitable);
+        } else {
+            waitable.run();
+        }
+        try {
+            waitable.get();
+        } catch (final InterruptedException e) {
+            Thread.currentThread().interrupt(); // tag, you're it
+        } catch (final ExecutionException e) {
+            throw new RuntimeException("Exception processing chat", e.getCause());
+        }
+    }
+
+    private static void post(final Event event) {
+        Bukkit.getPluginManager().callEvent(event);
+    }
+
+    private static boolean anyListeners(final HandlerList handlers) {
+        return handlers.getRegisteredListeners().length > 0;
+    }
+}
diff --git a/src/main/java/io/papermc/paper/adventure/DisplayNames.java b/src/main/java/io/papermc/paper/adventure/DisplayNames.java
new file mode 100644
index 0000000000000000000000000000000000000000..b1d9d6276eb577ed3c66df1f89b3266d2c48eaf2
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/DisplayNames.java
@@ -0,0 +1,22 @@
+package io.papermc.paper.adventure;
+
+import net.minecraft.server.level.EntityPlayer;
+import org.bukkit.ChatColor;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+
+public final class DisplayNames {
+    private DisplayNames() {
+    }
+
+    public static String getLegacy(final CraftPlayer player) {
+        return getLegacy(player.getHandle());
+    }
+
+    public static String getLegacy(final EntityPlayer player) {
+        final String legacy = player.displayName;
+        if (legacy != null) {
+            return PaperAdventure.LEGACY_SECTION_UXRC.serialize(player.adventure$displayName) + ChatColor.getLastColors(player.displayName);
+        }
+        return PaperAdventure.LEGACY_SECTION_UXRC.serialize(player.adventure$displayName);
+    }
+}
diff --git a/src/main/java/io/papermc/paper/adventure/LazyChatAudienceSet.java b/src/main/java/io/papermc/paper/adventure/LazyChatAudienceSet.java
new file mode 100644
index 0000000000000000000000000000000000000000..10f08e2b73610ab06928d1f63348920fef8e91fa
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/LazyChatAudienceSet.java
@@ -0,0 +1,21 @@
+package io.papermc.paper.adventure;
+
+import net.kyori.adventure.audience.Audience;
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.util.LazyHashSet;
+import org.bukkit.craftbukkit.util.LazyPlayerSet;
+import org.bukkit.entity.Player;
+
+import java.util.HashSet;
+import java.util.Set;
+
+final class LazyChatAudienceSet extends LazyHashSet<Audience> {
+    @Override
+    protected Set<Audience> makeReference() {
+        final Set<Player> playerSet = LazyPlayerSet.makePlayerSet(MinecraftServer.getServer());
+        final HashSet<Audience> audiences = new HashSet<>(playerSet);
+        audiences.add(Bukkit.getConsoleSender());
+        return audiences;
+    }
+}
diff --git a/src/main/java/io/papermc/paper/adventure/NBTLegacyHoverEventSerializer.java b/src/main/java/io/papermc/paper/adventure/NBTLegacyHoverEventSerializer.java
new file mode 100644
index 0000000000000000000000000000000000000000..caa9708f321f04cd02534161231c05999bda4acd
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/NBTLegacyHoverEventSerializer.java
@@ -0,0 +1,88 @@
+package io.papermc.paper.adventure;
+
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import java.io.IOException;
+import java.util.UUID;
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.nbt.api.BinaryTagHolder;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.event.HoverEvent;
+import net.kyori.adventure.text.serializer.gson.LegacyHoverEventSerializer;
+import net.kyori.adventure.text.serializer.plain.PlainComponentSerializer;
+import net.kyori.adventure.util.Codec;
+import net.minecraft.nbt.MojangsonParser;
+import net.minecraft.nbt.NBTBase;
+import net.minecraft.nbt.NBTTagCompound;
+
+final class NBTLegacyHoverEventSerializer implements LegacyHoverEventSerializer {
+    public static final NBTLegacyHoverEventSerializer INSTANCE = new NBTLegacyHoverEventSerializer();
+    private static final Codec<NBTTagCompound, String, CommandSyntaxException, RuntimeException> SNBT_CODEC = Codec.of(MojangsonParser::parse, NBTBase::toString);
+
+    static final String ITEM_TYPE = "id";
+    static final String ITEM_COUNT = "Count";
+    static final String ITEM_TAG = "tag";
+
+    static final String ENTITY_NAME = "name";
+    static final String ENTITY_TYPE = "type";
+    static final String ENTITY_ID = "id";
+
+    NBTLegacyHoverEventSerializer() {
+    }
+
+    @Override
+    public HoverEvent.ShowItem deserializeShowItem(final Component input) throws IOException {
+        final String raw = PlainComponentSerializer.plain().serialize(input);
+        try {
+            final NBTTagCompound contents = SNBT_CODEC.decode(raw);
+            final NBTTagCompound tag = contents.getCompound(ITEM_TAG);
+            return HoverEvent.ShowItem.of(
+                Key.key(contents.getString(ITEM_TYPE)),
+                contents.hasKey(ITEM_COUNT) ? contents.getByte(ITEM_COUNT) : 1,
+                tag.isEmpty() ? null : BinaryTagHolder.encode(tag, SNBT_CODEC)
+            );
+        } catch (final CommandSyntaxException ex) {
+            throw new IOException(ex);
+        }
+    }
+
+    @Override
+    public HoverEvent.ShowEntity deserializeShowEntity(final Component input, final Codec.Decoder<Component, String, ? extends RuntimeException> componentCodec) throws IOException {
+        final String raw = PlainComponentSerializer.plain().serialize(input);
+        try {
+            final NBTTagCompound contents = SNBT_CODEC.decode(raw);
+            return HoverEvent.ShowEntity.of(
+                Key.key(contents.getString(ENTITY_TYPE)),
+                UUID.fromString(contents.getString(ENTITY_ID)),
+                componentCodec.decode(contents.getString(ENTITY_NAME))
+            );
+        } catch (final CommandSyntaxException ex) {
+            throw new IOException(ex);
+        }
+    }
+
+    @Override
+    public Component serializeShowItem(final HoverEvent.ShowItem input) throws IOException {
+        final NBTTagCompound tag = new NBTTagCompound();
+        tag.setString(ITEM_TYPE, input.item().asString());
+        tag.setByte(ITEM_COUNT, (byte) input.count());
+        if (input.nbt() != null) {
+            try {
+                tag.set(ITEM_TAG, input.nbt().get(SNBT_CODEC));
+            } catch (final CommandSyntaxException ex) {
+                throw new IOException(ex);
+            }
+        }
+        return Component.text(SNBT_CODEC.encode(tag));
+    }
+
+    @Override
+    public Component serializeShowEntity(final HoverEvent.ShowEntity input, final Codec.Encoder<Component, String, ? extends RuntimeException> componentCodec) throws IOException {
+        final NBTTagCompound tag = new NBTTagCompound();
+        tag.setString(ENTITY_ID, input.id().toString());
+        tag.setString(ENTITY_TYPE, input.type().asString());
+        if (input.name() != null) {
+            tag.setString(ENTITY_NAME, componentCodec.encode(input.name()));
+        }
+        return Component.text(SNBT_CODEC.encode(tag));
+    }
+}
diff --git a/src/main/java/io/papermc/paper/adventure/PaperAdventure.java b/src/main/java/io/papermc/paper/adventure/PaperAdventure.java
new file mode 100644
index 0000000000000000000000000000000000000000..c60457e9240c33a4721b82a00cef081fb320c8a7
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/PaperAdventure.java
@@ -0,0 +1,344 @@
+package io.papermc.paper.adventure;
+
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import io.netty.util.AttributeKey;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import net.kyori.adventure.bossbar.BossBar;
+import net.kyori.adventure.inventory.Book;
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.nbt.api.BinaryTagHolder;
+import net.kyori.adventure.sound.Sound;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.TranslatableComponent;
+import net.kyori.adventure.text.flattener.ComponentFlattener;
+import net.kyori.adventure.text.format.TextColor;
+import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
+import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
+import net.kyori.adventure.text.serializer.plain.PlainComponentSerializer;
+import net.kyori.adventure.translation.GlobalTranslator;
+import net.kyori.adventure.util.Codec;
+import net.minecraft.EnumChatFormat;
+import net.minecraft.locale.LocaleLanguage;
+import net.minecraft.nbt.MojangsonParser;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.nbt.NBTTagList;
+import net.minecraft.nbt.NBTTagString;
+import net.minecraft.network.chat.IChatBaseComponent;
+import net.minecraft.resources.MinecraftKey;
+import net.minecraft.sounds.SoundCategory;
+import net.minecraft.world.BossBattle;
+import net.minecraft.world.item.ItemStack;
+import org.bukkit.ChatColor;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class PaperAdventure {
+    public static final AttributeKey<Locale> LOCALE_ATTRIBUTE = AttributeKey.valueOf("adventure:locale");
+    private static final Pattern LOCALIZATION_PATTERN = Pattern.compile("%(?:(\\d+)\\$)?s");
+    public static final ComponentFlattener FLATTENER = ComponentFlattener.basic().toBuilder()
+        .complexMapper(TranslatableComponent.class, (translatable, consumer) -> {
+            final @NonNull String translated = LocaleLanguage.a().a(translatable.key());
+
+            final Matcher matcher = LOCALIZATION_PATTERN.matcher(translated);
+            final List<Component> args = translatable.args();
+            int argPosition = 0;
+            int lastIdx = 0;
+            while (matcher.find()) {
+                // append prior
+                if (lastIdx < matcher.start()) {
+                    consumer.accept(Component.text(translated.substring(lastIdx, matcher.start())));
+                }
+                lastIdx = matcher.end();
+
+                final @Nullable String argIdx = matcher.group(1);
+                // calculate argument position
+                if (argIdx != null) {
+                    try {
+                        final int idx = Integer.parseInt(argIdx) - 1;
+                        if (idx < args.size()) {
+                            consumer.accept(args.get(idx));
+                        }
+                    } catch (final NumberFormatException ex) {
+                        // ignore, drop the format placeholder
+                    }
+                } else {
+                    final int idx = argPosition++;
+                    if (idx < args.size()) {
+                        consumer.accept(args.get(idx));
+                    }
+                }
+            }
+
+            // append tail
+            if (lastIdx < translated.length()) {
+                consumer.accept(Component.text(translated.substring(lastIdx)));
+            }
+        })
+        .build();
+    public static final LegacyComponentSerializer LEGACY_SECTION_UXRC = LegacyComponentSerializer.builder().flattener(FLATTENER).hexColors().useUnusualXRepeatedCharacterHexFormat().build();
+    public static final PlainComponentSerializer PLAIN = PlainComponentSerializer.builder().flattener(FLATTENER).build();
+    public static final GsonComponentSerializer GSON = GsonComponentSerializer.builder()
+        .legacyHoverEventSerializer(NBTLegacyHoverEventSerializer.INSTANCE)
+        .build();
+    public static final GsonComponentSerializer COLOR_DOWNSAMPLING_GSON = GsonComponentSerializer.builder()
+        .legacyHoverEventSerializer(NBTLegacyHoverEventSerializer.INSTANCE)
+        .downsampleColors()
+        .build();
+    private static final Codec<NBTTagCompound, String, IOException, IOException> NBT_CODEC = new Codec<NBTTagCompound, String, IOException, IOException>() {
+        @Override
+        public @NonNull NBTTagCompound decode(final @NonNull String encoded) throws IOException {
+            try {
+                return MojangsonParser.parse(encoded);
+            } catch (final CommandSyntaxException e) {
+                throw new IOException(e);
+            }
+        }
+
+        @Override
+        public @NonNull String encode(final @NonNull NBTTagCompound decoded) {
+            return decoded.toString();
+        }
+    };
+    static final WrapperAwareSerializer WRAPPER_AWARE_SERIALIZER = new WrapperAwareSerializer();
+
+    private PaperAdventure() {
+    }
+
+    // Key
+
+    public static MinecraftKey asVanilla(final Key key) {
+        return new MinecraftKey(key.namespace(), key.value());
+    }
+
+    public static MinecraftKey asVanillaNullable(final Key key) {
+        if (key == null) {
+            return null;
+        }
+        return new MinecraftKey(key.namespace(), key.value());
+    }
+
+    // Component
+
+    public static Component asAdventure(final IChatBaseComponent component) {
+        return GSON.serializer().fromJson(IChatBaseComponent.ChatSerializer.toJsonTree(component), Component.class);
+    }
+
+    public static ArrayList<Component> asAdventure(final List<IChatBaseComponent> vanillas) {
+        final ArrayList<Component> adventures = new ArrayList<>(vanillas.size());
+        for (final IChatBaseComponent vanilla : vanillas) {
+            adventures.add(asAdventure(vanilla));
+        }
+        return adventures;
+    }
+
+    public static ArrayList<Component> asAdventureFromJson(final List<String> jsonStrings) {
+        final ArrayList<Component> adventures = new ArrayList<>(jsonStrings.size());
+        for (final String json : jsonStrings) {
+            adventures.add(GsonComponentSerializer.gson().deserialize(json));
+        }
+        return adventures;
+    }
+
+    public static List<String> asJson(final List<Component> adventures) {
+        final List<String> jsons = new ArrayList<>(adventures.size());
+        for (final Component component : adventures) {
+            jsons.add(GsonComponentSerializer.gson().serialize(component));
+        }
+        return jsons;
+    }
+
+    public static IChatBaseComponent asVanilla(final Component component) {
+        if (true) return new AdventureComponent(component);
+        return IChatBaseComponent.ChatSerializer.fromJsonTree(GSON.serializer().toJsonTree(component));
+    }
+
+    public static List<IChatBaseComponent> asVanilla(final List<Component> adventures) {
+        final List<IChatBaseComponent> vanillas = new ArrayList<>(adventures.size());
+        for (final Component adventure : adventures) {
+            vanillas.add(asVanilla(adventure));
+        }
+        return vanillas;
+    }
+
+    public static String asJsonString(final Component component, final Locale locale) {
+        return GSON.serialize(
+            GlobalTranslator.render(
+                component,
+                // play it safe
+                locale != null
+                    ? locale
+                    : Locale.US
+            )
+        );
+    }
+
+    public static String asJsonString(final IChatBaseComponent component, final Locale locale) {
+        if (component instanceof AdventureComponent) {
+            return asJsonString(((AdventureComponent) component).wrapped, locale);
+        }
+        return IChatBaseComponent.ChatSerializer.componentToJson(component);
+    }
+
+    // thank you for being worse than wet socks, Bukkit
+    public static String superHackyLegacyRepresentationOfComponent(final Component component, final String string) {
+        return LEGACY_SECTION_UXRC.serialize(component) + ChatColor.getLastColors(string);
+    }
+
+    // BossBar
+
+    public static BossBattle.BarColor asVanilla(final BossBar.Color color) {
+        if (color == BossBar.Color.PINK) {
+            return BossBattle.BarColor.PINK;
+        } else if (color == BossBar.Color.BLUE) {
+            return BossBattle.BarColor.BLUE;
+        } else if (color == BossBar.Color.RED) {
+            return BossBattle.BarColor.RED;
+        } else if (color == BossBar.Color.GREEN) {
+            return BossBattle.BarColor.GREEN;
+        } else if (color == BossBar.Color.YELLOW) {
+            return BossBattle.BarColor.YELLOW;
+        } else if (color == BossBar.Color.PURPLE) {
+            return BossBattle.BarColor.PURPLE;
+        } else if (color == BossBar.Color.WHITE) {
+            return BossBattle.BarColor.WHITE;
+        }
+        throw new IllegalArgumentException(color.name());
+    }
+
+    public static BossBar.Color asAdventure(final BossBattle.BarColor color) {
+        if(color == BossBattle.BarColor.PINK) {
+            return BossBar.Color.PINK;
+        } else if(color == BossBattle.BarColor.BLUE) {
+            return BossBar.Color.BLUE;
+        } else if(color == BossBattle.BarColor.RED) {
+            return BossBar.Color.RED;
+        } else if(color == BossBattle.BarColor.GREEN) {
+            return BossBar.Color.GREEN;
+        } else if(color == BossBattle.BarColor.YELLOW) {
+            return BossBar.Color.YELLOW;
+        } else if(color == BossBattle.BarColor.PURPLE) {
+            return BossBar.Color.PURPLE;
+        } else if(color == BossBattle.BarColor.WHITE) {
+            return BossBar.Color.WHITE;
+        }
+        throw new IllegalArgumentException(color.name());
+    }
+
+    public static BossBattle.BarStyle asVanilla(final BossBar.Overlay overlay) {
+        if (overlay == BossBar.Overlay.PROGRESS) {
+            return BossBattle.BarStyle.PROGRESS;
+        } else if (overlay == BossBar.Overlay.NOTCHED_6) {
+            return BossBattle.BarStyle.NOTCHED_6;
+        } else if (overlay == BossBar.Overlay.NOTCHED_10) {
+            return BossBattle.BarStyle.NOTCHED_10;
+        } else if (overlay == BossBar.Overlay.NOTCHED_12) {
+            return BossBattle.BarStyle.NOTCHED_12;
+        } else if (overlay == BossBar.Overlay.NOTCHED_20) {
+            return BossBattle.BarStyle.NOTCHED_20;
+        }
+        throw new IllegalArgumentException(overlay.name());
+    }
+
+    public static BossBar.Overlay asAdventure(final BossBattle.BarStyle overlay) {
+        if (overlay == BossBattle.BarStyle.PROGRESS) {
+            return BossBar.Overlay.PROGRESS;
+        } else if (overlay == BossBattle.BarStyle.NOTCHED_6) {
+            return BossBar.Overlay.NOTCHED_6;
+        } else if (overlay == BossBattle.BarStyle.NOTCHED_10) {
+            return BossBar.Overlay.NOTCHED_10;
+        } else if (overlay == BossBattle.BarStyle.NOTCHED_12) {
+            return BossBar.Overlay.NOTCHED_12;
+        } else if (overlay == BossBattle.BarStyle.NOTCHED_20) {
+            return BossBar.Overlay.NOTCHED_20;
+        }
+        throw new IllegalArgumentException(overlay.name());
+    }
+
+    public static void setFlag(final BossBar bar, final BossBar.Flag flag, final boolean value) {
+        if (value) {
+            bar.addFlag(flag);
+        } else {
+            bar.removeFlag(flag);
+        }
+    }
+
+    // Book
+
+    public static ItemStack asItemStack(final Book book, final Locale locale) {
+        final ItemStack item = new ItemStack(net.minecraft.world.item.Items.WRITTEN_BOOK, 1);
+        final NBTTagCompound tag = item.getOrCreateTag();
+        tag.setString("title", asJsonString(book.title(), locale));
+        tag.setString("author", asJsonString(book.author(), locale));
+        final NBTTagList pages = new NBTTagList();
+        for (final Component page : book.pages()) {
+            pages.add(NBTTagString.create(asJsonString(page, locale)));
+        }
+        tag.set("pages", pages);
+        return item;
+    }
+
+    // Sounds
+
+    public static SoundCategory asVanilla(final Sound.Source source) {
+        if (source == Sound.Source.MASTER) {
+            return SoundCategory.MASTER;
+        } else if (source == Sound.Source.MUSIC) {
+            return SoundCategory.MUSIC;
+        } else if (source == Sound.Source.RECORD) {
+            return SoundCategory.RECORDS;
+        } else if (source == Sound.Source.WEATHER) {
+            return SoundCategory.WEATHER;
+        } else if (source == Sound.Source.BLOCK) {
+            return SoundCategory.BLOCKS;
+        } else if (source == Sound.Source.HOSTILE) {
+            return SoundCategory.HOSTILE;
+        } else if (source == Sound.Source.NEUTRAL) {
+            return SoundCategory.NEUTRAL;
+        } else if (source == Sound.Source.PLAYER) {
+            return SoundCategory.PLAYERS;
+        } else if (source == Sound.Source.AMBIENT) {
+            return SoundCategory.AMBIENT;
+        } else if (source == Sound.Source.VOICE) {
+            return SoundCategory.VOICE;
+        }
+        throw new IllegalArgumentException(source.name());
+    }
+
+    public static @Nullable SoundCategory asVanillaNullable(final Sound.@Nullable Source source) {
+        if (source == null) {
+            return null;
+        }
+        return asVanilla(source);
+    }
+
+    // NBT
+
+    public static @Nullable BinaryTagHolder asBinaryTagHolder(final @Nullable NBTTagCompound tag) {
+        if (tag == null) {
+            return null;
+        }
+        try {
+            return BinaryTagHolder.encode(tag, NBT_CODEC);
+        } catch (final IOException e) {
+            return null;
+        }
+    }
+
+    // Colors
+
+    public static @NonNull TextColor asAdventure(EnumChatFormat minecraftColor) {
+        if (minecraftColor.e() == null) {
+            throw new IllegalArgumentException("Not a valid color");
+        }
+        return TextColor.color(minecraftColor.e());
+    }
+
+    public static @Nullable EnumChatFormat asVanilla(TextColor color) {
+        return EnumChatFormat.getByHexValue(color.value());
+    }
+}
diff --git a/src/main/java/io/papermc/paper/adventure/VanillaBossBarListener.java b/src/main/java/io/papermc/paper/adventure/VanillaBossBarListener.java
new file mode 100644
index 0000000000000000000000000000000000000000..3a4158781e464d9a860bab72ed719a41929c8add
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/VanillaBossBarListener.java
@@ -0,0 +1,41 @@
+package io.papermc.paper.adventure;
+
+import java.util.Set;
+import java.util.function.Consumer;
+import net.kyori.adventure.bossbar.BossBar;
+import net.kyori.adventure.text.Component;
+import net.minecraft.network.protocol.game.PacketPlayOutBoss;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+public final class VanillaBossBarListener implements BossBar.Listener {
+    private final Consumer<PacketPlayOutBoss.Action> action;
+
+    public VanillaBossBarListener(final Consumer<PacketPlayOutBoss.Action> action) {
+        this.action = action;
+    }
+
+    @Override
+    public void bossBarNameChanged(final @NonNull BossBar bar, final @NonNull Component oldName, final @NonNull Component newName) {
+        this.action.accept(PacketPlayOutBoss.Action.UPDATE_NAME);
+    }
+
+    @Override
+    public void bossBarProgressChanged(final @NonNull BossBar bar, final float oldProgress, final float newProgress) {
+        this.action.accept(PacketPlayOutBoss.Action.UPDATE_PCT);
+    }
+
+    @Override
+    public void bossBarColorChanged(final @NonNull BossBar bar, final BossBar.@NonNull Color oldColor, final BossBar.@NonNull Color newColor) {
+        this.action.accept(PacketPlayOutBoss.Action.UPDATE_STYLE);
+    }
+
+    @Override
+    public void bossBarOverlayChanged(final @NonNull BossBar bar, final BossBar.@NonNull Overlay oldOverlay, final BossBar.@NonNull Overlay newOverlay) {
+        this.action.accept(PacketPlayOutBoss.Action.UPDATE_STYLE);
+    }
+
+    @Override
+    public void bossBarFlagsChanged(final @NonNull BossBar bar, final @NonNull Set<BossBar.Flag> flagsAdded, final @NonNull Set<BossBar.Flag> flagsRemoved) {
+        this.action.accept(PacketPlayOutBoss.Action.UPDATE_PROPERTIES);
+    }
+}
diff --git a/src/main/java/io/papermc/paper/adventure/WrapperAwareSerializer.java b/src/main/java/io/papermc/paper/adventure/WrapperAwareSerializer.java
new file mode 100644
index 0000000000000000000000000000000000000000..625b57a4274d6348a85897b92ff07fee7ae3a7ab
--- /dev/null
+++ b/src/main/java/io/papermc/paper/adventure/WrapperAwareSerializer.java
@@ -0,0 +1,20 @@
+package io.papermc.paper.adventure;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.serializer.ComponentSerializer;
+import net.minecraft.network.chat.IChatBaseComponent;
+
+final class WrapperAwareSerializer implements ComponentSerializer<Component, Component, IChatBaseComponent> {
+    @Override
+    public Component deserialize(final IChatBaseComponent input) {
+        if (input instanceof AdventureComponent) {
+            return ((AdventureComponent) input).wrapped;
+        }
+        return PaperAdventure.GSON.serializer().fromJson(IChatBaseComponent.ChatSerializer.toJsonTree(input), Component.class);
+    }
+
+    @Override
+    public IChatBaseComponent serialize(final Component component) {
+        return IChatBaseComponent.ChatSerializer.fromJsonTree(PaperAdventure.GSON.serializer().toJsonTree(component));
+    }
+}
diff --git a/src/main/java/net/kyori/adventure/bossbar/HackyBossBarPlatformBridge.java b/src/main/java/net/kyori/adventure/bossbar/HackyBossBarPlatformBridge.java
new file mode 100644
index 0000000000000000000000000000000000000000..b3e26b9ecca7055760d05975d36c9ae74e0d7d4b
--- /dev/null
+++ b/src/main/java/net/kyori/adventure/bossbar/HackyBossBarPlatformBridge.java
@@ -0,0 +1,36 @@
+package net.kyori.adventure.bossbar;
+
+import io.papermc.paper.adventure.PaperAdventure;
+import io.papermc.paper.adventure.VanillaBossBarListener;
+import net.minecraft.server.level.BossBattleServer;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+
+public abstract class HackyBossBarPlatformBridge {
+    public BossBattleServer vanilla$bar;
+    private VanillaBossBarListener vanilla$listener;
+
+    public final void paper$playerShow(final CraftPlayer player) {
+        if (this.vanilla$bar == null) {
+            final BossBar $this = (BossBar) this;
+            this.vanilla$bar = new BossBattleServer(
+                PaperAdventure.asVanilla($this.name()),
+                PaperAdventure.asVanilla($this.color()),
+                PaperAdventure.asVanilla($this.overlay())
+            );
+            this.vanilla$bar.adventure = $this;
+            this.vanilla$listener = new VanillaBossBarListener(this.vanilla$bar::sendUpdate);
+            $this.addListener(this.vanilla$listener);
+        }
+        this.vanilla$bar.addPlayer(player.getHandle());
+    }
+
+    public final void paper$playerHide(final CraftPlayer player) {
+        if (this.vanilla$bar != null) {
+            this.vanilla$bar.removePlayer(player.getHandle());
+            if (this.vanilla$bar.getPlayers().isEmpty()) {
+                ((BossBar) this).removeListener(this.vanilla$listener);
+                this.vanilla$bar = null;
+            }
+        }
+    }
+}
diff --git a/src/main/java/net/minecraft/EnumChatFormat.java b/src/main/java/net/minecraft/EnumChatFormat.java
index 75e38f05c10713f773a8763100dfc0777521dba6..cd93f99e939438c572a4258d299a6038ebfc60a8 100644
--- a/src/main/java/net/minecraft/EnumChatFormat.java
+++ b/src/main/java/net/minecraft/EnumChatFormat.java
@@ -61,6 +61,7 @@ public enum EnumChatFormat {
         return !this.A && this != EnumChatFormat.RESET;
     }
 
+    @Nullable public Integer getHexValue() { return this.e(); } // Paper - OBFHELPER
     @Nullable
     public Integer e() {
         return this.D;
@@ -84,6 +85,18 @@ public enum EnumChatFormat {
         return s == null ? null : (EnumChatFormat) EnumChatFormat.w.get(c(s));
     }
 
+    // Paper start
+    @Nullable public static EnumChatFormat getByHexValue(int i) {
+        for (EnumChatFormat value : values()) {
+            if (value.getHexValue() != null && value.getHexValue() == i) {
+                return value;
+            }
+        }
+
+        return null;
+    }
+    // Paper end
+
     @Nullable
     public static EnumChatFormat a(int i) {
         if (i < 0) {
diff --git a/src/main/java/net/minecraft/nbt/NBTTagString.java b/src/main/java/net/minecraft/nbt/NBTTagString.java
index e26ef49d9dde8ed0fb4267b48cb597563967f313..0e41fdb6ba711fbd2240d62e2030b3a12e14c8d6 100644
--- a/src/main/java/net/minecraft/nbt/NBTTagString.java
+++ b/src/main/java/net/minecraft/nbt/NBTTagString.java
@@ -43,6 +43,7 @@ public class NBTTagString implements NBTBase {
         this.data = s;
     }
 
+    public static NBTTagString create(final String value) { return a(value); } // Paper - OBFHELPER
     public static NBTTagString a(String s) {
         return s.isEmpty() ? NBTTagString.b : new NBTTagString(s);
     }
diff --git a/src/main/java/net/minecraft/network/PacketDataSerializer.java b/src/main/java/net/minecraft/network/PacketDataSerializer.java
index 5413bf93f7f0f4491fca1f07c47a925fdace7751..5f1c5dd7902f6cff5acae05e8c6bf58a1ba5bdf1 100644
--- a/src/main/java/net/minecraft/network/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/network/PacketDataSerializer.java
@@ -10,6 +10,7 @@ import io.netty.buffer.ByteBufOutputStream;
 import io.netty.handler.codec.DecoderException;
 import io.netty.handler.codec.EncoderException;
 import io.netty.util.ByteProcessor;
+import io.papermc.paper.adventure.PaperAdventure; // Paper
 import java.io.DataInput;
 import java.io.DataOutput;
 import java.io.IOException;
@@ -44,6 +45,7 @@ import org.bukkit.craftbukkit.inventory.CraftItemStack; // CraftBukkit
 public class PacketDataSerializer extends ByteBuf {
 
     private final ByteBuf a;
+    public java.util.Locale adventure$locale; // Paper
 
     public PacketDataSerializer(ByteBuf bytebuf) {
         this.a = bytebuf;
@@ -165,8 +167,15 @@ public class PacketDataSerializer extends ByteBuf {
         return IChatBaseComponent.ChatSerializer.a(this.e(262144));
     }
 
+    // Paper start
+    public PacketDataSerializer writeComponent(final net.kyori.adventure.text.Component component) {
+        return this.writeUtf(PaperAdventure.asJsonString(component, this.adventure$locale), 262144);
+    }
+    // Paper end
+
     public PacketDataSerializer a(IChatBaseComponent ichatbasecomponent) {
-        return this.a(IChatBaseComponent.ChatSerializer.a(ichatbasecomponent), 262144);
+        //return this.a(IChatBaseComponent.ChatSerializer.a(ichatbasecomponent), 262144); // Paper - comment
+        return this.writeUtf(PaperAdventure.asJsonString(ichatbasecomponent, this.adventure$locale), 262144); // Paper
     }
 
     public <T extends Enum<T>> T a(Class<T> oclass) {
@@ -349,6 +358,7 @@ public class PacketDataSerializer extends ByteBuf {
         return this.a(s, 32767);
     }
 
+    public PacketDataSerializer writeUtf(final String string, final int maxLength) { return this.a(string, maxLength); } // Paper - OBFHELPER
     public PacketDataSerializer a(String s, int i) {
         byte[] abyte = s.getBytes(StandardCharsets.UTF_8);
 
diff --git a/src/main/java/net/minecraft/network/PacketEncoder.java b/src/main/java/net/minecraft/network/PacketEncoder.java
index dc8cc8d6c00176c8562086282f726dc1b24b2c65..2f6da89d6b25ba5144ec15b1bf0e8ed13278e85e 100644
--- a/src/main/java/net/minecraft/network/PacketEncoder.java
+++ b/src/main/java/net/minecraft/network/PacketEncoder.java
@@ -3,6 +3,7 @@ package net.minecraft.network;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToByteEncoder;
+import io.papermc.paper.adventure.PaperAdventure; // Paper
 import java.io.IOException;
 import net.minecraft.network.protocol.EnumProtocolDirection;
 import net.minecraft.network.protocol.Packet;
@@ -37,6 +38,7 @@ public class PacketEncoder extends MessageToByteEncoder<Packet<?>> {
                 throw new IOException("Can't serialize unregistered packet");
             } else {
                 PacketDataSerializer packetdataserializer = new PacketDataSerializer(bytebuf);
+                packetdataserializer.adventure$locale = channelhandlercontext.channel().attr(PaperAdventure.LOCALE_ATTRIBUTE).get(); // Paper
 
                 packetdataserializer.d(integer);
 
diff --git a/src/main/java/net/minecraft/network/chat/IChatBaseComponent.java b/src/main/java/net/minecraft/network/chat/IChatBaseComponent.java
index 85140d961722e86abfe7006a0ad752751e73c721..e96fa348a37a39c381b6659f612232933686c2a7 100644
--- a/src/main/java/net/minecraft/network/chat/IChatBaseComponent.java
+++ b/src/main/java/net/minecraft/network/chat/IChatBaseComponent.java
@@ -1,5 +1,6 @@
 package net.minecraft.network.chat;
 
+import io.papermc.paper.adventure.AdventureComponent; // Paper
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonArray;
@@ -111,6 +112,7 @@ public interface IChatBaseComponent extends Message, IChatFormatted, Iterable<IC
             GsonBuilder gsonbuilder = new GsonBuilder();
 
             gsonbuilder.disableHtmlEscaping();
+            gsonbuilder.registerTypeAdapter(AdventureComponent.class, new AdventureComponent.Serializer()); // Paper
             gsonbuilder.registerTypeHierarchyAdapter(IChatBaseComponent.class, new IChatBaseComponent.ChatSerializer());
             gsonbuilder.registerTypeHierarchyAdapter(ChatModifier.class, new ChatModifier.ChatModifierSerializer());
             gsonbuilder.registerTypeAdapterFactory(new ChatTypeAdapterFactory());
@@ -263,6 +265,7 @@ public interface IChatBaseComponent extends Message, IChatFormatted, Iterable<IC
         }
 
         public JsonElement serialize(IChatBaseComponent ichatbasecomponent, Type type, JsonSerializationContext jsonserializationcontext) {
+            if (ichatbasecomponent instanceof AdventureComponent) return jsonserializationcontext.serialize(ichatbasecomponent); // Paper
             JsonObject jsonobject = new JsonObject();
 
             if (!ichatbasecomponent.getChatModifier().g()) {
@@ -351,10 +354,12 @@ public interface IChatBaseComponent extends Message, IChatFormatted, Iterable<IC
             return jsonobject;
         }
 
+        public static String componentToJson(final IChatBaseComponent component) { return a(component); } // Paper - OBFHELPER
         public static String a(IChatBaseComponent ichatbasecomponent) {
             return IChatBaseComponent.ChatSerializer.a.toJson(ichatbasecomponent);
         }
 
+        public static JsonElement toJsonTree(final IChatBaseComponent component) { return b(component); } // Paper - OBFHELPER
         public static JsonElement b(IChatBaseComponent ichatbasecomponent) {
             return IChatBaseComponent.ChatSerializer.a.toJsonTree(ichatbasecomponent);
         }
@@ -364,6 +369,7 @@ public interface IChatBaseComponent extends Message, IChatFormatted, Iterable<IC
             return (IChatMutableComponent) ChatDeserializer.a(IChatBaseComponent.ChatSerializer.a, s, IChatMutableComponent.class, false);
         }
 
+        public static @Nullable IChatBaseComponent fromJsonTree(final JsonElement json) { return a(json); } // Paper - OBFHELPER
         @Nullable
         public static IChatMutableComponent a(JsonElement jsonelement) {
             return (IChatMutableComponent) IChatBaseComponent.ChatSerializer.a.fromJson(jsonelement, IChatMutableComponent.class);
diff --git a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java
index 2bfe15e693271bcd4bbccfa436bae72178633135..edae451a54bfcd6b54e89c1619fb112a7763eb3b 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutChat.java
@@ -11,6 +11,7 @@ import net.minecraft.network.protocol.Packet;
 public class PacketPlayOutChat implements Packet<PacketListenerPlayOut> {
 
     private IChatBaseComponent a;
+    public net.kyori.adventure.text.Component adventure$message; // Paper
     public net.md_5.bungee.api.chat.BaseComponent[] components; // Spigot
     private ChatMessageType b;
     private UUID c;
@@ -32,6 +33,11 @@ public class PacketPlayOutChat implements Packet<PacketListenerPlayOut> {
 
     @Override
     public void b(PacketDataSerializer packetdataserializer) throws IOException {
+        // Paper start
+        if (this.adventure$message != null) {
+            packetdataserializer.writeComponent(this.adventure$message);
+        } else
+        // Paper end
         // Spigot start
         if (components != null) {
             packetdataserializer.a(net.md_5.bungee.chat.ComponentSerializer.toString(components));
diff --git a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutPlayerListHeaderFooter.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutPlayerListHeaderFooter.java
index 0268b8e6595ee919bcd55a74ba872a2b7d2a17d8..4ff73a4fc5e8a8739e57d2bac65076812cbe5132 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutPlayerListHeaderFooter.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutPlayerListHeaderFooter.java
@@ -9,6 +9,10 @@ public class PacketPlayOutPlayerListHeaderFooter implements Packet<PacketListene
 
     public IChatBaseComponent header;
     public IChatBaseComponent footer;
+    // Paper start
+    public net.kyori.adventure.text.Component adventure$header;
+    public net.kyori.adventure.text.Component adventure$footer;
+    // Paper end
 
     public PacketPlayOutPlayerListHeaderFooter() {}
 
@@ -20,6 +24,13 @@ public class PacketPlayOutPlayerListHeaderFooter implements Packet<PacketListene
 
     @Override
     public void b(PacketDataSerializer packetdataserializer) throws IOException {
+        // Paper start
+        if (this.adventure$header != null && this.adventure$footer != null) {
+            packetdataserializer.writeComponent(this.adventure$header);
+            packetdataserializer.writeComponent(this.adventure$footer);
+            return;
+        }
+        // Paper end
         packetdataserializer.a(this.header);
         packetdataserializer.a(this.footer);
     }
diff --git a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutTitle.java b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutTitle.java
index 9c44a3d9273afaf4d35f4ff86727386b34d9eb06..fff22c40ba38575951e8e4821ade22b29d580a89 100644
--- a/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutTitle.java
+++ b/src/main/java/net/minecraft/network/protocol/game/PacketPlayOutTitle.java
@@ -10,6 +10,7 @@ public class PacketPlayOutTitle implements Packet<PacketListenerPlayOut> {
 
     private PacketPlayOutTitle.EnumTitleAction a;
     private IChatBaseComponent b;
+    public net.kyori.adventure.text.Component adventure$text; // Paper
     private int c;
     private int d;
     private int e;
@@ -51,6 +52,11 @@ public class PacketPlayOutTitle implements Packet<PacketListenerPlayOut> {
     public void b(PacketDataSerializer packetdataserializer) throws IOException {
         packetdataserializer.a((Enum) this.a);
         if (this.a == PacketPlayOutTitle.EnumTitleAction.TITLE || this.a == PacketPlayOutTitle.EnumTitleAction.SUBTITLE || this.a == PacketPlayOutTitle.EnumTitleAction.ACTIONBAR) {
+            // Paper start
+            if (this.adventure$text != null) {
+                packetdataserializer.writeComponent(this.adventure$text);
+            } else
+            // Paper end
             packetdataserializer.a(this.b);
         }
 
diff --git a/src/main/java/net/minecraft/server/level/EntityPlayer.java b/src/main/java/net/minecraft/server/level/EntityPlayer.java
index 3fa2e077912949f6ca7b14da93c2206215ebcc7e..5ef8b66cf266488df75ce7399596f75273b90761 100644
--- a/src/main/java/net/minecraft/server/level/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/level/EntityPlayer.java
@@ -143,6 +143,7 @@ import net.minecraft.world.item.enchantment.EnchantmentManager;
 import net.minecraft.world.level.block.BlockChest;
 import net.minecraft.world.level.dimension.DimensionManager;
 import net.minecraft.world.scores.Scoreboard;
+import io.papermc.paper.adventure.PaperAdventure; // Paper
 import org.bukkit.Bukkit;
 import org.bukkit.GameMode;
 import org.bukkit.Location;
@@ -212,6 +213,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     // CraftBukkit start
     public String displayName;
+    public net.kyori.adventure.text.Component adventure$displayName; // Paper
     public IChatBaseComponent listName;
     public org.bukkit.Location compassTarget;
     public int newExp = 0;
@@ -242,6 +244,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
         // CraftBukkit start
         this.displayName = this.getName();
+        this.adventure$displayName = net.kyori.adventure.text.Component.text(this.getName()); // Paper
         this.canPickUpLoot = true;
         this.maxHealthCache = this.getMaxHealth();
     }
@@ -695,23 +698,17 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
         IChatBaseComponent defaultMessage = this.getCombatTracker().getDeathMessage();
 
-        String deathmessage = defaultMessage.getString();
-        org.bukkit.event.entity.PlayerDeathEvent event = CraftEventFactory.callPlayerDeathEvent(this, loot, deathmessage, keepInventory);
+        org.bukkit.event.entity.PlayerDeathEvent event = CraftEventFactory.callPlayerDeathEvent(this, loot, PaperAdventure.asAdventure(defaultMessage), defaultMessage.getString(), keepInventory); // Paper - Adventure
 
         // SPIGOT-943 - only call if they have an inventory open
         if (this.activeContainer != this.defaultContainer) {
             this.closeInventory();
         }
 
-        String deathMessage = event.getDeathMessage();
+        net.kyori.adventure.text.Component deathMessage = event.deathMessage() != null ? event.deathMessage() : net.kyori.adventure.text.Component.empty(); // Paper - Adventure
 
-        if (deathMessage != null && deathMessage.length() > 0 && flag) { // TODO: allow plugins to override?
-            IChatBaseComponent ichatbasecomponent;
-            if (deathMessage.equals(deathmessage)) {
-                ichatbasecomponent = this.getCombatTracker().getDeathMessage();
-            } else {
-                ichatbasecomponent = org.bukkit.craftbukkit.util.CraftChatMessage.fromStringOrNull(deathMessage);
-            }
+        if (deathMessage != null && deathMessage != net.kyori.adventure.text.Component.empty() && flag) { // Paper - Adventure // TODO: allow plugins to override?
+            IChatBaseComponent ichatbasecomponent = PaperAdventure.asVanilla(deathMessage); // Paper - Adventure
 
             this.playerConnection.a((Packet) (new PacketPlayOutCombatEvent(this.getCombatTracker(), PacketPlayOutCombatEvent.EnumCombatEventType.ENTITY_DIED, ichatbasecomponent)), (future) -> {
                 if (!future.isSuccess()) {
@@ -1669,6 +1666,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         this.a(ichatbasecomponent, ChatMessageType.SYSTEM, uuid);
     }
 
+    public void sendMessage(final IChatBaseComponent message, final ChatMessageType type, final UUID sender) { this.a(message, type, sender); } // Paper - OBFHELPER
     public void a(IChatBaseComponent ichatbasecomponent, ChatMessageType chatmessagetype, UUID uuid) {
         this.playerConnection.a((Packet) (new PacketPlayOutChat(ichatbasecomponent, chatmessagetype, uuid)), (future) -> {
             if (!future.isSuccess() && (chatmessagetype == ChatMessageType.GAME_INFO || chatmessagetype == ChatMessageType.SYSTEM)) {
@@ -1691,6 +1689,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     }
 
     public String locale = "en_us"; // CraftBukkit - add, lowercase
+    public java.util.Locale adventure$locale = java.util.Locale.US; // Paper
     public void a(PacketPlayInSettings packetplayinsettings) {
         // CraftBukkit start
         if (getMainHand() != packetplayinsettings.getMainHand()) {
@@ -1702,6 +1701,10 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
             this.server.server.getPluginManager().callEvent(event);
         }
         this.locale = packetplayinsettings.locale;
+        // Paper start
+        this.adventure$locale = net.kyori.adventure.translation.Translator.parseLocale(this.locale);
+        this.playerConnection.networkManager.channel.attr(PaperAdventure.LOCALE_ATTRIBUTE).set(this.adventure$locale);
+        // Paper end
         this.clientViewDistance = packetplayinsettings.viewDistance;
         // CraftBukkit end
         this.bY = packetplayinsettings.d();
diff --git a/src/main/java/net/minecraft/server/network/LoginListener.java b/src/main/java/net/minecraft/server/network/LoginListener.java
index 16275208954bfc008115aa169c5bfc149f6a4eeb..49a0aefc7f9544b36175fdf3161b255e878952a6 100644
--- a/src/main/java/net/minecraft/server/network/LoginListener.java
+++ b/src/main/java/net/minecraft/server/network/LoginListener.java
@@ -37,6 +37,7 @@ import org.apache.logging.log4j.Logger;
 
 // CraftBukkit start
 import net.minecraft.network.chat.ChatComponentText;
+import io.papermc.paper.adventure.PaperAdventure; // Paper
 import org.bukkit.craftbukkit.util.Waitable;
 import org.bukkit.event.player.AsyncPlayerPreLoginEvent;
 import org.bukkit.event.player.PlayerPreLoginEvent;
@@ -301,7 +302,7 @@ public class LoginListener implements PacketLoginInListener {
                         if (PlayerPreLoginEvent.getHandlerList().getRegisteredListeners().length != 0) {
                             final PlayerPreLoginEvent event = new PlayerPreLoginEvent(playerName, address, uniqueId);
                             if (asyncEvent.getResult() != PlayerPreLoginEvent.Result.ALLOWED) {
-                                event.disallow(asyncEvent.getResult(), asyncEvent.getKickMessage());
+                                event.disallow(asyncEvent.getResult(), asyncEvent.kickMessage()); // Paper - Adventure
                             }
                             Waitable<PlayerPreLoginEvent.Result> waitable = new Waitable<PlayerPreLoginEvent.Result>() {
                                 @Override
@@ -312,12 +313,12 @@ public class LoginListener implements PacketLoginInListener {
 
                             LoginListener.this.server.processQueue.add(waitable);
                             if (waitable.get() != PlayerPreLoginEvent.Result.ALLOWED) {
-                                disconnect(event.getKickMessage());
+                                disconnect(PaperAdventure.asVanilla(event.kickMessage())); // Paper - Adventure
                                 return;
                             }
                         } else {
                             if (asyncEvent.getLoginResult() != AsyncPlayerPreLoginEvent.Result.ALLOWED) {
-                                disconnect(asyncEvent.getKickMessage());
+                                disconnect(PaperAdventure.asVanilla(asyncEvent.kickMessage())); // Paper - Adventure
                                 return;
                             }
                         }
diff --git a/src/main/java/net/minecraft/server/network/PacketStatusListener.java b/src/main/java/net/minecraft/server/network/PacketStatusListener.java
index 2a96564c1656d42a74c331a6178e511cd5347a66..d219eda271a71f786808a6958b829fca40a1aaba 100644
--- a/src/main/java/net/minecraft/server/network/PacketStatusListener.java
+++ b/src/main/java/net/minecraft/server/network/PacketStatusListener.java
@@ -56,7 +56,7 @@ public class PacketStatusListener implements PacketStatusInListener {
                 CraftIconCache icon = minecraftServer.server.getServerIcon();
 
                 ServerListPingEvent() {
-                    super(((InetSocketAddress) networkManager.getSocketAddress()).getAddress(), minecraftServer.getMotd(), minecraftServer.getPlayerList().getMaxPlayers());
+                    super(((InetSocketAddress) networkManager.getSocketAddress()).getAddress(), minecraftServer.server.motd(), minecraftServer.getPlayerList().getMaxPlayers()); // Paper - Adventure
                 }
 
                 @Override
diff --git a/src/main/java/net/minecraft/server/network/PlayerConnection.java b/src/main/java/net/minecraft/server/network/PlayerConnection.java
index 536a351e1879fcb8066546d1179ad1af034b95da..5db09e60c2ac1f4cb0da3190e57896ccae7c58a3 100644
--- a/src/main/java/net/minecraft/server/network/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/network/PlayerConnection.java
@@ -159,6 +159,8 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 // CraftBukkit start
+import io.papermc.paper.adventure.ChatProcessor; // Paper
+import io.papermc.paper.adventure.PaperAdventure; // Paper
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
 import net.minecraft.network.protocol.game.PacketPlayOutAttachEntity;
@@ -390,21 +392,24 @@ public class PlayerConnection implements PacketListenerPlayIn {
         return this.minecraftServer.a(this.player.getProfile());
     }
 
-    // CraftBukkit start
-    @Deprecated
-    public void disconnect(IChatBaseComponent ichatbasecomponent) {
-        disconnect(CraftChatMessage.fromComponent(ichatbasecomponent));
+    public void disconnect(String s) {
+        // Paper start
+        this.disconnect(PaperAdventure.LEGACY_SECTION_UXRC.deserialize(s));
     }
-    // CraftBukkit end
 
-    public void disconnect(String s) {
+    public void disconnect(final IChatBaseComponent reason) {
+        this.disconnect(PaperAdventure.asAdventure(reason));
+    }
+
+    public void disconnect(net.kyori.adventure.text.Component reason) {
+        // Paper end
         // CraftBukkit start - fire PlayerKickEvent
         if (this.processedDisconnect) {
             return;
         }
-        String leaveMessage = EnumChatFormat.YELLOW + this.player.getName() + " left the game.";
+        net.kyori.adventure.text.Component leaveMessage = net.kyori.adventure.text.Component.translatable("multiplayer.player.left", net.kyori.adventure.text.format.NamedTextColor.YELLOW, this.player.getBukkitEntity().displayName()); // Paper - Adventure
 
-        PlayerKickEvent event = new PlayerKickEvent(this.server.getPlayer(this.player), s, leaveMessage);
+        PlayerKickEvent event = new PlayerKickEvent(this.server.getPlayer(this.player), reason, leaveMessage); // Paper - Adventure
 
         if (this.server.getServer().isRunning()) {
             this.server.getPluginManager().callEvent(event);
@@ -415,8 +420,7 @@ public class PlayerConnection implements PacketListenerPlayIn {
             return;
         }
         // Send the possibly modified leave message
-        s = event.getReason();
-        final IChatBaseComponent ichatbasecomponent = CraftChatMessage.fromString(s, true)[0];
+        final IChatBaseComponent ichatbasecomponent = PaperAdventure.asVanilla(event.reason()); // Paper - Adventure
         // CraftBukkit end
 
         this.networkManager.sendPacket(new PacketPlayOutKickDisconnect(ichatbasecomponent), (future) -> {
@@ -1633,9 +1637,11 @@ public class PlayerConnection implements PacketListenerPlayIn {
         */
 
         this.player.p();
-        String quitMessage = this.minecraftServer.getPlayerList().disconnect(this.player);
-        if ((quitMessage != null) && (quitMessage.length() > 0)) {
-            this.minecraftServer.getPlayerList().sendMessage(CraftChatMessage.fromString(quitMessage));
+        // Paper start - Adventure
+        net.kyori.adventure.text.Component quitMessage = this.minecraftServer.getPlayerList().disconnect(this.player);
+        if ((quitMessage != null) && !quitMessage.equals(net.kyori.adventure.text.Component.empty())) {
+            this.minecraftServer.getPlayerList().sendMessage(PaperAdventure.asVanilla(quitMessage));
+            // Paper end
         }
         // CraftBukkit end
         ITextFilter itextfilter = this.player.Q();
@@ -1851,8 +1857,13 @@ public class PlayerConnection implements PacketListenerPlayIn {
             this.handleCommand(s);
         } else if (this.player.getChatFlags() == EnumChatVisibility.SYSTEM) {
             // Do nothing, this is coming from a plugin
-        } else {
-            Player player = this.getPlayer();
+        // Paper start
+        } else if (true) {
+            final ChatProcessor cp = new ChatProcessor(this.minecraftServer, this.player, s, async);
+            cp.process();
+        // Paper end
+        } else if (false) { // Paper
+            Player player = this.getPlayer(); // Paper
             AsyncPlayerChatEvent event = new AsyncPlayerChatEvent(async, player, s, new LazyPlayerSet(minecraftServer));
             this.server.getPluginManager().callEvent(event);
 
@@ -2670,21 +2681,20 @@ public class PlayerConnection implements PacketListenerPlayIn {
                 return;
             }
 
-            // CraftBukkit start
-            Player player = this.server.getPlayer(this.player);
-            int x = packetplayinupdatesign.b().getX();
-            int y = packetplayinupdatesign.b().getY();
-            int z = packetplayinupdatesign.b().getZ();
-            String[] lines = new String[4];
+            // CraftBukkit start // Paper start - Adventure
+            List<net.kyori.adventure.text.Component> lines = new java.util.ArrayList<>();
 
             for (int i = 0; i < list.size(); ++i) {
-                lines[i] = EnumChatFormat.a(new ChatComponentText(EnumChatFormat.a((String) list.get(i))).getString());
+                lines.add(net.kyori.adventure.text.Component.text(list.get(i)));
             }
-            SignChangeEvent event = new SignChangeEvent((org.bukkit.craftbukkit.block.CraftBlock) player.getWorld().getBlockAt(x, y, z), this.server.getPlayer(this.player), lines);
+            SignChangeEvent event = new SignChangeEvent(org.bukkit.craftbukkit.block.CraftBlock.at(worldserver, blockposition), this.getPlayer(), lines);
             this.server.getPluginManager().callEvent(event);
 
             if (!event.isCancelled()) {
-                System.arraycopy(org.bukkit.craftbukkit.block.CraftSign.sanitizeLines(event.getLines()), 0, tileentitysign.lines, 0, 4);
+                for (int i = 0; i < 4; i++) {
+                    tileentitysign.a(i, PaperAdventure.asVanilla(event.line(i)));
+                }
+                // Paper end
                 tileentitysign.isEditable = false;
              }
             // CraftBukkit end
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index c601a5c577e438a3fa8dd4c5f36dbe9494b03d52..6ebd4ec781aa215c2b941261250c15c87c223cab 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -8,6 +8,7 @@ import com.mojang.authlib.GameProfile;
 import com.mojang.serialization.DataResult;
 import com.mojang.serialization.Dynamic;
 import io.netty.buffer.Unpooled;
+import io.papermc.paper.adventure.PaperAdventure;
 import java.io.File;
 import java.net.SocketAddress;
 import java.text.SimpleDateFormat;
@@ -92,6 +93,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 // CraftBukkit start
+import io.papermc.paper.adventure.PaperAdventure; // Paper
 import com.google.common.base.Predicate;
 import com.google.common.collect.Iterables;
 
@@ -255,7 +257,7 @@ public abstract class PlayerList {
         }
         // CraftBukkit start
         chatmessage.a(EnumChatFormat.YELLOW);
-        String joinMessage = CraftChatMessage.fromComponent(chatmessage);
+        IChatBaseComponent joinMessage = chatmessage; // Paper - Adventure
 
         playerconnection.a(entityplayer.locX(), entityplayer.locY(), entityplayer.locZ(), entityplayer.yaw, entityplayer.pitch);
         this.players.add(entityplayer);
@@ -264,19 +266,18 @@ public abstract class PlayerList {
         // this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[]{entityplayer})); // CraftBukkit - replaced with loop below
 
         // CraftBukkit start
-        PlayerJoinEvent playerJoinEvent = new PlayerJoinEvent(cserver.getPlayer(entityplayer), joinMessage);
+        PlayerJoinEvent playerJoinEvent = new org.bukkit.event.player.PlayerJoinEvent(cserver.getPlayer(entityplayer), PaperAdventure.asAdventure(chatmessage)); // Paper - Adventure
         cserver.getPluginManager().callEvent(playerJoinEvent);
 
         if (!entityplayer.playerConnection.networkManager.isConnected()) {
             return;
         }
 
-        joinMessage = playerJoinEvent.getJoinMessage();
+        final net.kyori.adventure.text.Component jm = playerJoinEvent.joinMessage();
 
-        if (joinMessage != null && joinMessage.length() > 0) {
-            for (IChatBaseComponent line : org.bukkit.craftbukkit.util.CraftChatMessage.fromString(joinMessage)) {
-                server.getPlayerList().sendAll(new PacketPlayOutChat(line, ChatMessageType.SYSTEM, SystemUtils.b));
-            }
+        if (jm != null && !jm.equals(net.kyori.adventure.text.Component.empty())) { // Paper - Adventure
+            joinMessage = PaperAdventure.asVanilla(jm); // Paper - Adventure
+            server.getPlayerList().sendAll(new PacketPlayOutChat(joinMessage, ChatMessageType.SYSTEM, SystemUtils.b)); // Paper - Adventure
         }
         // CraftBukkit end
 
@@ -473,7 +474,7 @@ public abstract class PlayerList {
 
     }
 
-    public String disconnect(EntityPlayer entityplayer) { // CraftBukkit - return string
+    public net.kyori.adventure.text.Component disconnect(EntityPlayer entityplayer) { // Paper - return Component
         WorldServer worldserver = entityplayer.getWorldServer();
 
         entityplayer.a(StatisticList.LEAVE_GAME);
@@ -484,7 +485,7 @@ public abstract class PlayerList {
             entityplayer.closeInventory();
         }
 
-        PlayerQuitEvent playerQuitEvent = new PlayerQuitEvent(cserver.getPlayer(entityplayer), "\u00A7e" + entityplayer.getName() + " left the game");
+        PlayerQuitEvent playerQuitEvent = new PlayerQuitEvent(cserver.getPlayer(entityplayer), net.kyori.adventure.text.Component.translatable("multiplayer.player.left", net.kyori.adventure.text.format.NamedTextColor.YELLOW, com.destroystokyo.paper.PaperConfig.useDisplayNameInQuit ? entityplayer.getBukkitEntity().displayName() : net.kyori.adventure.text.Component.text(entityplayer.getName())));
         cserver.getPluginManager().callEvent(playerQuitEvent);
         entityplayer.getBukkitEntity().disconnect(playerQuitEvent.getQuitMessage());
 
@@ -545,7 +546,7 @@ public abstract class PlayerList {
         cserver.getScoreboardManager().removePlayer(entityplayer.getBukkitEntity());
         // CraftBukkit end
 
-        return playerQuitEvent.getQuitMessage(); // CraftBukkit
+        return playerQuitEvent.quitMessage(); // Paper - Adventure
     }
 
     // CraftBukkit start - Whole method, SocketAddress to LoginListener, added hostname to signature, return EntityPlayer
@@ -591,10 +592,10 @@ public abstract class PlayerList {
             }
 
             // return chatmessage;
-            if (!gameprofilebanentry.hasExpired()) event.disallow(PlayerLoginEvent.Result.KICK_BANNED, CraftChatMessage.fromComponent(chatmessage)); // Spigot
+            if (!gameprofilebanentry.hasExpired()) event.disallow(PlayerLoginEvent.Result.KICK_BANNED, PaperAdventure.asAdventure(chatmessage)); // Spigot // Paper - Adventure
         } else if (!this.isWhitelisted(gameprofile)) {
             chatmessage = new ChatMessage("multiplayer.disconnect.not_whitelisted");
-            event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, org.spigotmc.SpigotConfig.whitelistMessage); // Spigot
+            event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, PaperAdventure.LEGACY_SECTION_UXRC.deserialize(org.spigotmc.SpigotConfig.whitelistMessage)); // Spigot // Paper - Adventure
         } else if (getIPBans().isBanned(socketaddress) && !getIPBans().get(socketaddress).hasExpired()) {
             IpBanEntry ipbanentry = this.l.get(socketaddress);
 
@@ -604,17 +605,17 @@ public abstract class PlayerList {
             }
 
             // return chatmessage;
-            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, CraftChatMessage.fromComponent(chatmessage));
+            event.disallow(PlayerLoginEvent.Result.KICK_BANNED, PaperAdventure.asAdventure(chatmessage)); // Paper - Adventure
         } else {
             // return this.players.size() >= this.maxPlayers && !this.f(gameprofile) ? new ChatMessage("multiplayer.disconnect.server_full") : null;
             if (this.players.size() >= this.maxPlayers && !this.f(gameprofile)) {
-                event.disallow(PlayerLoginEvent.Result.KICK_FULL, org.spigotmc.SpigotConfig.serverFullMessage); // Spigot
+                event.disallow(PlayerLoginEvent.Result.KICK_FULL, PaperAdventure.LEGACY_SECTION_UXRC.deserialize(org.spigotmc.SpigotConfig.serverFullMessage)); // Spigot // Paper - Adventure
             }
         }
 
         cserver.getPluginManager().callEvent(event);
         if (event.getResult() != PlayerLoginEvent.Result.ALLOWED) {
-            loginlistener.disconnect(event.getKickMessage());
+            loginlistener.disconnect(PaperAdventure.asVanilla(event.kickMessage())); // Paper - Adventure
             return null;
         }
         return entity;
@@ -1135,7 +1136,7 @@ public abstract class PlayerList {
     public void shutdown() {
         // CraftBukkit start - disconnect safely
         for (EntityPlayer player : this.players) {
-            player.playerConnection.disconnect(this.server.server.getShutdownMessage()); // CraftBukkit - add custom shutdown message
+            player.playerConnection.disconnect(this.server.server.shutdownMessage()); // CraftBukkit - add custom shutdown message // Paper - Adventure
         }
         // CraftBukkit end
 
diff --git a/src/main/java/net/minecraft/world/BossBattle.java b/src/main/java/net/minecraft/world/BossBattle.java
index f9154b306379c45f15fe55406aaa00351b0471e8..1fb9fea7683075f427edfa411c7747d60928d537 100644
--- a/src/main/java/net/minecraft/world/BossBattle.java
+++ b/src/main/java/net/minecraft/world/BossBattle.java
@@ -1,5 +1,6 @@
 package net.minecraft.world;
 
+import io.papermc.paper.adventure.PaperAdventure;
 import java.util.UUID;
 import net.minecraft.EnumChatFormat;
 import net.minecraft.network.chat.IChatBaseComponent;
@@ -14,6 +15,7 @@ public abstract class BossBattle {
     protected boolean e;
     protected boolean f;
     protected boolean g;
+    public net.kyori.adventure.bossbar.BossBar adventure; // Paper
 
     public BossBattle(UUID uuid, IChatBaseComponent ichatbasecomponent, BossBattle.BarColor bossbattle_barcolor, BossBattle.BarStyle bossbattle_barstyle) {
         this.h = uuid;
@@ -28,61 +30,75 @@ public abstract class BossBattle {
     }
 
     public IChatBaseComponent j() {
+        if(this.adventure != null) return PaperAdventure.asVanilla(this.adventure.name()); // Paper
         return this.title;
     }
 
     public void a(IChatBaseComponent ichatbasecomponent) {
+        if (this.adventure != null) this.adventure.name(PaperAdventure.asAdventure(ichatbasecomponent)); // Paper
         this.title = ichatbasecomponent;
     }
 
     public float getProgress() {
+        if (this.adventure != null) return this.adventure.progress(); // Paper
         return this.b;
     }
 
     public void a(float f) {
+        if (this.adventure != null) this.adventure.progress(f); // Paper
         this.b = f;
     }
 
     public BossBattle.BarColor l() {
+        if (this.adventure != null) return PaperAdventure.asVanilla(this.adventure.color()); // Paper
         return this.color;
     }
 
     public void a(BossBattle.BarColor bossbattle_barcolor) {
+        if(this.adventure != null) this.adventure.color(PaperAdventure.asAdventure(bossbattle_barcolor)); // Paper
         this.color = bossbattle_barcolor;
     }
 
     public BossBattle.BarStyle m() {
+        if(this.adventure != null) return PaperAdventure.asVanilla(this.adventure.overlay()); // Paper
         return this.style;
     }
 
     public void a(BossBattle.BarStyle bossbattle_barstyle) {
+        if(this.adventure != null) this.adventure.overlay(PaperAdventure.asAdventure(bossbattle_barstyle)); // Paper
         this.style = bossbattle_barstyle;
     }
 
     public boolean isDarkenSky() {
+        if(this.adventure != null) return this.adventure.hasFlag(net.kyori.adventure.bossbar.BossBar.Flag.DARKEN_SCREEN); // Paper
         return this.e;
     }
 
     public BossBattle a(boolean flag) {
+        if(this.adventure != null) PaperAdventure.setFlag(this.adventure, net.kyori.adventure.bossbar.BossBar.Flag.DARKEN_SCREEN, flag); // Paper
         this.e = flag;
         return this;
     }
 
     public boolean isPlayMusic() {
+        if(this.adventure != null) return this.adventure.hasFlag(net.kyori.adventure.bossbar.BossBar.Flag.PLAY_BOSS_MUSIC); // Paper
         return this.f;
     }
 
     public BossBattle b(boolean flag) {
+        if(this.adventure != null) PaperAdventure.setFlag(this.adventure, net.kyori.adventure.bossbar.BossBar.Flag.PLAY_BOSS_MUSIC, flag); // Paper
         this.f = flag;
         return this;
     }
 
     public BossBattle c(boolean flag) {
+        if(this.adventure != null) PaperAdventure.setFlag(this.adventure, net.kyori.adventure.bossbar.BossBar.Flag.CREATE_WORLD_FOG, flag); // Paper
         this.g = flag;
         return this;
     }
 
     public boolean isCreateFog() {
+        if(this.adventure != null) return this.adventure.hasFlag(net.kyori.adventure.bossbar.BossBar.Flag.CREATE_WORLD_FOG); // Paper
         return this.g;
     }
 
diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index 4010152dccc93019f2e7f284d80b92bae0d91c34..f1a780768e3f4bdb43a7ca6d7850befefb71bf57 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -867,6 +867,7 @@ public final class ItemStack {
     }
     // CraftBukkit end
 
+    public IChatBaseComponent displayName() { return this.C(); } // Paper - OBFHELPER
     public IChatBaseComponent C() {
         IChatMutableComponent ichatmutablecomponent = (new ChatComponentText("")).addSibling(this.getName());
 
diff --git a/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java b/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java
index 0134bbda9e6fc900b7eefa05442e25539bab3431..b76ef55145336cc8dc4857b79767f5a738ad5144 100644
--- a/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java
+++ b/src/main/java/net/minecraft/world/item/enchantment/Enchantment.java
@@ -94,6 +94,7 @@ public abstract class Enchantment {
         return this.f();
     }
 
+    public final IChatBaseComponent getTranslationComponentForLevel(int level) { return this.d(level); } // Paper - OBFHELPER
     public IChatBaseComponent d(int i) {
         ChatMessage chatmessage = new ChatMessage(this.g());
 
diff --git a/src/main/java/net/minecraft/world/level/saveddata/maps/WorldMap.java b/src/main/java/net/minecraft/world/level/saveddata/maps/WorldMap.java
index 7ec93ddd7e7c9dc54e3e4dcfe0d1654c0b0a8536..3f057f0bd23bc1c693c8f04ee8acd6626c620008 100644
--- a/src/main/java/net/minecraft/world/level/saveddata/maps/WorldMap.java
+++ b/src/main/java/net/minecraft/world/level/saveddata/maps/WorldMap.java
@@ -32,6 +32,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 // CraftBukkit start
+import io.papermc.paper.adventure.PaperAdventure; // Paper
 import java.util.UUID;
 
 import org.bukkit.craftbukkit.CraftServer;
@@ -473,7 +474,7 @@ public class WorldMap extends PersistentBase {
             for ( org.bukkit.map.MapCursor cursor : render.cursors) {
 
                 if (cursor.isVisible()) {
-                    icons.add(new MapIcon(MapIcon.Type.a(cursor.getRawType()), cursor.getX(), cursor.getY(), cursor.getDirection(), CraftChatMessage.fromStringOrNull(cursor.getCaption())));
+                    icons.add(new MapIcon(MapIcon.Type.a(cursor.getRawType()), cursor.getX(), cursor.getY(), cursor.getDirection(), PaperAdventure.asVanilla(cursor.caption()))); // Paper - Adventure
                 }
             }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 0c1e12b0b43f949d4ace600b2ccdffe52faab1e6..2c2e87d96f61e7ef88847df70e1c6153bca9fcd3 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -562,8 +562,11 @@ public final class CraftServer implements Server {
     }
 
     @Override
+    @Deprecated // Paper start
     public int broadcastMessage(String message) {
-        return broadcast(message, BROADCAST_CHANNEL_USERS);
+        this.sendMessage(io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(message));
+        return this.getOnlinePlayers().size() + 1;
+        // Paper end
     }
 
     public Player getPlayer(final EntityPlayer entity) {
@@ -1307,7 +1310,15 @@ public final class CraftServer implements Server {
         return configuration.getInt("settings.spawn-radius", -1);
     }
 
+    // Paper start
     @Override
+    public net.kyori.adventure.text.Component shutdownMessage() {
+        String msg = getShutdownMessage();
+        return msg != null ? io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(msg) : null;
+    }
+    // Paper end
+    @Override
+    @Deprecated // Paper
     public String getShutdownMessage() {
         return configuration.getString("settings.shutdown-message");
     }
@@ -1423,7 +1434,15 @@ public final class CraftServer implements Server {
     }
 
     @Override
+    @Deprecated // Paper
     public int broadcast(String message, String permission) {
+        // Paper start - Adventure
+        return this.broadcast(io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(message), permission);
+    }
+
+    @Override
+    public int broadcast(net.kyori.adventure.text.Component message, String permission) {
+        // Paper end
         Set<CommandSender> recipients = new HashSet<>();
         for (Permissible permissible : getPluginManager().getPermissionSubscriptions(permission)) {
             if (permissible instanceof CommandSender && permissible.hasPermission(permission)) {
@@ -1431,14 +1450,14 @@ public final class CraftServer implements Server {
             }
         }
 
-        BroadcastMessageEvent broadcastMessageEvent = new BroadcastMessageEvent(!Bukkit.isPrimaryThread(), message, recipients);
+        BroadcastMessageEvent broadcastMessageEvent = new BroadcastMessageEvent(!Bukkit.isPrimaryThread(), message, recipients); // Paper - Adventure
         getPluginManager().callEvent(broadcastMessageEvent);
 
         if (broadcastMessageEvent.isCancelled()) {
             return 0;
         }
 
-        message = broadcastMessageEvent.getMessage();
+        message = broadcastMessageEvent.message(); // Paper - Adventure
 
         for (CommandSender recipient : recipients) {
             recipient.sendMessage(message);
@@ -1664,6 +1683,14 @@ public final class CraftServer implements Server {
         return CraftInventoryCreator.INSTANCE.createInventory(owner, type);
     }
 
+    // Paper start
+    @Override
+    public Inventory createInventory(InventoryHolder owner, InventoryType type, net.kyori.adventure.text.Component title) {
+        Validate.isTrue(type.isCreatable(), "Cannot open an inventory of type ", type);
+        return CraftInventoryCreator.INSTANCE.createInventory(owner, type, title);
+    }
+    // Paper end
+
     @Override
     public Inventory createInventory(InventoryHolder owner, InventoryType type, String title) {
         Validate.isTrue(type.isCreatable(), "Cannot open an inventory of type ", type);
@@ -1676,13 +1703,28 @@ public final class CraftServer implements Server {
         return CraftInventoryCreator.INSTANCE.createInventory(owner, size);
     }
 
+    // Paper start
+    @Override
+    public Inventory createInventory(InventoryHolder owner, int size, net.kyori.adventure.text.Component title) throws IllegalArgumentException {
+        Validate.isTrue(9 <= size && size <= 54 && size % 9 == 0, "Size for custom inventory must be a multiple of 9 between 9 and 54 slots (got " + size + ")");
+        return CraftInventoryCreator.INSTANCE.createInventory(owner, size, title);
+    }
+    // Paper end
+
     @Override
     public Inventory createInventory(InventoryHolder owner, int size, String title) throws IllegalArgumentException {
         Validate.isTrue(9 <= size && size <= 54 && size % 9 == 0, "Size for custom inventory must be a multiple of 9 between 9 and 54 slots (got " + size + ")");
         return CraftInventoryCreator.INSTANCE.createInventory(owner, size, title);
     }
 
+    // Paper start
     @Override
+    public Merchant createMerchant(net.kyori.adventure.text.Component title) {
+        return new org.bukkit.craftbukkit.inventory.CraftMerchantCustom(title == null ? InventoryType.MERCHANT.defaultTitle() : title);
+    }
+    // Paper end
+    @Override
+    @Deprecated // Paper
     public Merchant createMerchant(String title) {
         return new CraftMerchantCustom(title == null ? InventoryType.MERCHANT.getDefaultTitle() : title);
     }
@@ -1726,6 +1768,12 @@ public final class CraftServer implements Server {
         return Thread.currentThread().equals(console.serverThread) || console.hasStopped() || !org.spigotmc.AsyncCatcher.enabled; // All bets are off if we have shut down (e.g. due to watchdog)
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component motd() {
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(new net.minecraft.network.chat.ChatComponentText(console.getMotd()));
+    }
+    // Paper end
     @Override
     public String getMotd() {
         return console.getMotd();
@@ -2154,5 +2202,15 @@ public final class CraftServer implements Server {
             return null;
         }
     }
+
+    // Paper start
+    private Iterable<? extends net.kyori.adventure.audience.Audience> adventure$audiences;
+    @Override
+    public Iterable<? extends net.kyori.adventure.audience.Audience> audiences() {
+        if (this.adventure$audiences == null) {
+            this.adventure$audiences = com.google.common.collect.Iterables.concat(java.util.Collections.singleton(this.getConsoleSender()), this.getOnlinePlayers());
+        }
+        return this.adventure$audiences;
+    }
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
index 3b48799d084f14722f815cb35cbd48b618380fca..cf6d350e6afc46bb58678192fe0b24b7d923412e 100644
--- a/src/main/java/org/bukkit/craftbukkit/Main.java
+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
@@ -19,6 +19,12 @@ public class Main {
     public static boolean useConsole = true;
 
     public static void main(String[] args) {
+        // Paper start
+        final String warnWhenLegacyFormattingDetected = String.join(".", "net", "kyori", "adventure", "text", "warnWhenLegacyFormattingDetected");
+        if (false && System.getProperty(warnWhenLegacyFormattingDetected) == null) {
+            System.setProperty(warnWhenLegacyFormattingDetected, String.valueOf(true));
+        }
+        // Paper end
         // Todo: Installation script
         OptionParser parser = new OptionParser() {
             {
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBeacon.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBeacon.java
index ae735836accc6bf6f0831f72ff882720b69df792..d3ae5cadd88f9012203d2c04cbe38af9b215ef0b 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBeacon.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBeacon.java
@@ -70,6 +70,19 @@ public class CraftBeacon extends CraftBlockEntityState<TileEntityBeacon> impleme
         this.getSnapshot().secondaryEffect = (effect != null) ? MobEffectList.fromId(effect.getId()) : null;
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component customName() {
+        final TileEntityBeacon be = this.getSnapshot();
+        return be.customName != null ? io.papermc.paper.adventure.PaperAdventure.asAdventure(be.customName) : null;
+    }
+
+    @Override
+    public void customName(final net.kyori.adventure.text.Component customName) {
+        this.getSnapshot().setCustomName(customName != null ? io.papermc.paper.adventure.PaperAdventure.asVanilla(customName) : null);
+    }
+    // Paper end
+
     @Override
     public String getCustomName() {
         TileEntityBeacon beacon = this.getSnapshot();
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftContainer.java b/src/main/java/org/bukkit/craftbukkit/block/CraftContainer.java
index e8ce890c551c9b809e8ba3f7449dc33f3a3a6b80..c99a59573653ee5d14e780137c769116bf781ea7 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftContainer.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftContainer.java
@@ -32,6 +32,19 @@ public abstract class CraftContainer<T extends TileEntityContainer> extends Craf
         this.getSnapshot().chestLock = (key == null) ? ChestLock.a : new ChestLock(key);
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component customName() {
+        final T be = this.getSnapshot();
+        return be.hasCustomName() ? io.papermc.paper.adventure.PaperAdventure.asAdventure(be.getCustomName()) : null;
+    }
+
+    @Override
+    public void customName(final net.kyori.adventure.text.Component customName) {
+        this.getSnapshot().setCustomName(customName != null ? io.papermc.paper.adventure.PaperAdventure.asVanilla(customName) : null);
+    }
+    // Paper end
+
     @Override
     public String getCustomName() {
         T container = this.getSnapshot();
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftEnchantingTable.java b/src/main/java/org/bukkit/craftbukkit/block/CraftEnchantingTable.java
index a559a77aae870988f4dd5e6f5f1f08feb3fad054..75ee5cc96c0e54f99e2ce820289bb74f57c426a2 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftEnchantingTable.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftEnchantingTable.java
@@ -16,6 +16,19 @@ public class CraftEnchantingTable extends CraftBlockEntityState<TileEntityEnchan
         super(material, te);
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component customName() {
+        final TileEntityEnchantTable be = this.getSnapshot();
+        return be.hasCustomName() ? io.papermc.paper.adventure.PaperAdventure.asAdventure(be.getCustomName()) : null;
+    }
+
+    @Override
+    public void customName(final net.kyori.adventure.text.Component customName) {
+        this.getSnapshot().setCustomName(customName != null ? io.papermc.paper.adventure.PaperAdventure.asVanilla(customName) : null);
+    }
+    // Paper end
+
     @Override
     public String getCustomName() {
         TileEntityEnchantTable enchant = this.getSnapshot();
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java b/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
index 50d3f9ea1e905522096ef930c144589a1f0d539e..f4b601277ef75e5bc39d541a0d13c6eed3b1ef2c 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftSign.java
@@ -13,8 +13,10 @@ import org.bukkit.craftbukkit.util.CraftChatMessage;
 public class CraftSign extends CraftBlockEntityState<TileEntitySign> implements Sign {
 
     // Lazily initialized only if requested:
-    private String[] originalLines = null;
-    private String[] lines = null;
+    // Paper start
+    private java.util.ArrayList<net.kyori.adventure.text.Component> originalLines = null; // ArrayList for RandomAccess
+    private java.util.ArrayList<net.kyori.adventure.text.Component> lines = null; // ArrayList for RandomAccess
+    // Paper end
 
     public CraftSign(final Block block) {
         super(block, TileEntitySign.class);
@@ -24,27 +26,52 @@ public class CraftSign extends CraftBlockEntityState<TileEntitySign> implements
         super(material, te);
     }
 
+    // Paper start
     @Override
-    public String[] getLines() {
-        if (lines == null) {
-            // Lazy initialization:
-            TileEntitySign sign = this.getSnapshot();
-            lines = new String[sign.lines.length];
-            System.arraycopy(revertComponents(sign.lines), 0, lines, 0, lines.length);
-            originalLines = new String[lines.length];
-            System.arraycopy(lines, 0, originalLines, 0, originalLines.length);
+    public java.util.List<net.kyori.adventure.text.Component> lines() {
+        this.loadLines();
+        return this.lines;
+    }
+
+    @Override
+    public net.kyori.adventure.text.Component line(int index) {
+        this.loadLines();
+        return this.lines.get(index);
+    }
+
+    @Override
+    public void line(int index, net.kyori.adventure.text.Component line) {
+        this.loadLines();
+        this.lines.set(index, line);
+    }
+
+    private void loadLines() {
+        if (lines != null) {
+            return;
         }
-        return lines;
+
+        // Lazy initialization:
+        TileEntitySign sign = this.getSnapshot();
+        lines = io.papermc.paper.adventure.PaperAdventure.asAdventure(com.google.common.collect.Lists.newArrayList(sign.lines));
+        originalLines = new java.util.ArrayList<>(lines);
+    }
+    // Paper end
+    @Override
+    public String[] getLines() {
+        this.loadLines();
+        return this.lines.stream().map(io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC::serialize).toArray(String[]::new); // Paper
     }
 
     @Override
     public String getLine(int index) throws IndexOutOfBoundsException {
-        return getLines()[index];
+        this.loadLines();
+        return io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(this.lines.get(index)); // Paper
     }
 
     @Override
     public void setLine(int index, String line) throws IndexOutOfBoundsException {
-        getLines()[index] = line;
+        this.loadLines();
+        this.lines.set(index, line != null ? io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(line) : net.kyori.adventure.text.Component.empty()); // Paper
     }
 
     @Override
@@ -72,16 +99,32 @@ public class CraftSign extends CraftBlockEntityState<TileEntitySign> implements
         super.applyTo(sign);
 
         if (lines != null) {
-            for (int i = 0; i < lines.length; i++) {
-                String line = (lines[i] == null) ? "" : lines[i];
-                if (line.equals(originalLines[i])) {
+            // Paper start
+            for (int i = 0; i < this.lines.size(); ++i) {
+                net.kyori.adventure.text.Component component = this.lines.get(i);
+                net.kyori.adventure.text.Component origComp = this.originalLines.get(i);
+                if (component.equals(origComp)) {
                     continue; // The line contents are still the same, skip.
                 }
-                sign.lines[i] = CraftChatMessage.fromString(line)[0];
+                sign.lines[i] = io.papermc.paper.adventure.PaperAdventure.asVanilla(component);
             }
+            // Paper end
         }
     }
 
+    // Paper start
+    public static IChatBaseComponent[] sanitizeLines(java.util.List<net.kyori.adventure.text.Component> lines) {
+        IChatBaseComponent[] components = new IChatBaseComponent[4];
+        for (int i = 0; i < 4; i++) {
+            if (i < lines.size() && lines.get(i) != null) {
+                components[i] = io.papermc.paper.adventure.PaperAdventure.asVanilla(lines.get(i));
+            } else {
+                components[i] = new ChatComponentText("");
+            }
+        }
+        return components;
+    }
+    // Paper end
     public static IChatBaseComponent[] sanitizeLines(String[] lines) {
         IChatBaseComponent[] components = new IChatBaseComponent[4];
 
diff --git a/src/main/java/org/bukkit/craftbukkit/command/CraftConsoleCommandSender.java b/src/main/java/org/bukkit/craftbukkit/command/CraftConsoleCommandSender.java
index 089fe4a3458ed3106fa214f89a7004a5d3c6bb95..af986adfdb547cb61fbd52f0f89858f1a9e52cc3 100644
--- a/src/main/java/org/bukkit/craftbukkit/command/CraftConsoleCommandSender.java
+++ b/src/main/java/org/bukkit/craftbukkit/command/CraftConsoleCommandSender.java
@@ -80,4 +80,11 @@ public class CraftConsoleCommandSender extends ServerCommandSender implements Co
     public boolean isConversing() {
         return conversationTracker.isConversing();
     }
+
+    // Paper start
+    @Override
+    public void sendMessage(final net.kyori.adventure.identity.Identity identity, final net.kyori.adventure.text.Component message, final net.kyori.adventure.audience.MessageType type) {
+        this.sendRawMessage(org.bukkit.craftbukkit.util.CraftChatMessage.fromComponent(io.papermc.paper.adventure.PaperAdventure.asVanilla(message)));
+    }
+    // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java b/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java
index 8f694de2fb3827b9be0dd768ad90eb72c7d708e4..5a14430f63894bbe9daa42900cf5a6519bea4f45 100644
--- a/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java
+++ b/src/main/java/org/bukkit/craftbukkit/enchantments/CraftEnchantment.java
@@ -187,6 +187,12 @@ public class CraftEnchantment extends Enchantment {
         CraftEnchantment ench = (CraftEnchantment) other;
         return !target.isCompatible(ench.target);
     }
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component displayName(int level) {
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(getHandle().getTranslationComponentForLevel(level));
+    }
+    // Paper end
 
     public net.minecraft.world.item.enchantment.Enchantment getHandle() {
         return target;
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index eea242af23825ad29ada6e997205e87edffb6bb9..3cf81734c8580f4d88ea97b6ac737a370b413c84 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -768,6 +768,19 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         return getHandle().getVehicle().getBukkitEntity();
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component customName() {
+        final IChatBaseComponent name = this.getHandle().getCustomName();
+        return name != null ? io.papermc.paper.adventure.PaperAdventure.asAdventure(name) : null;
+    }
+
+    @Override
+    public void customName(final net.kyori.adventure.text.Component customName) {
+        this.getHandle().setCustomName(customName != null ? io.papermc.paper.adventure.PaperAdventure.asVanilla(customName) : null);
+    }
+    // Paper end
+
     @Override
     public void setCustomName(String name) {
         // sane limit for name length
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
index 3a4e2261d0b0cd17df3f96e75f3c509156679c48..105d0388998d1e35e634d2163fe1a44aa7037ac8 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java
@@ -316,9 +316,12 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
         container = CraftEventFactory.callInventoryOpenEvent(player, container);
         if (container == null) return;
 
-        String title = container.getBukkitView().getTitle();
+        //String title = container.getBukkitView().getTitle(); // Paper - comment
+        net.kyori.adventure.text.Component adventure$title = container.getBukkitView().title(); // Paper
+        if (adventure$title == null) adventure$title = io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(container.getBukkitView().getTitle()); // Paper
 
-        player.playerConnection.sendPacket(new PacketPlayOutOpenWindow(container.windowId, windowType, CraftChatMessage.fromString(title)[0]));
+        //player.playerConnection.sendPacket(new PacketPlayOutOpenWindow(container.windowId, windowType, CraftChatMessage.fromString(title)[0])); // Paper // Paper - comment
+        player.playerConnection.sendPacket(new PacketPlayOutOpenWindow(container.windowId, windowType, io.papermc.paper.adventure.PaperAdventure.asVanilla(adventure$title))); // Paper
         getHandle().activeContainer = container;
         getHandle().activeContainer.addSlotListener(player);
     }
@@ -387,8 +390,12 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
 
         // Now open the window
         Containers<?> windowType = CraftContainer.getNotchInventoryType(inventory.getTopInventory());
-        String title = inventory.getTitle();
-        player.playerConnection.sendPacket(new PacketPlayOutOpenWindow(container.windowId, windowType, CraftChatMessage.fromString(title)[0]));
+
+        //String title = inventory.getTitle(); // Paper - comment
+        net.kyori.adventure.text.Component adventure$title = inventory.title(); // Paper
+        if (adventure$title == null) adventure$title = io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(inventory.getTitle()); // Paper
+        //player.playerConnection.sendPacket(new PacketPlayOutOpenWindow(container.windowId, windowType, CraftChatMessage.fromString(title)[0])); // Paper - comment
+        player.playerConnection.sendPacket(new PacketPlayOutOpenWindow(container.windowId, windowType, io.papermc.paper.adventure.PaperAdventure.asVanilla(adventure$title))); // Paper
         player.activeContainer = container;
         player.activeContainer.addSlotListener(player);
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index b51a874e4665f977a154792e6216e03e04525f39..6ab14bccb1fcd108931bf7ec331e60f652e0b42d 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -240,14 +240,39 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
 
     @Override
     public String getDisplayName() {
+        if(true) return io.papermc.paper.adventure.DisplayNames.getLegacy(this); // Paper
         return getHandle().displayName;
     }
 
     @Override
     public void setDisplayName(final String name) {
+        this.getHandle().adventure$displayName = name != null ? io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(name) : net.kyori.adventure.text.Component.text(this.getName()); // Paper
         getHandle().displayName = name == null ? getName() : name;
     }
 
+    // Paper start
+    @Override
+    public void playerListName(net.kyori.adventure.text.Component name) {
+        getHandle().listName = name == null ? null : io.papermc.paper.adventure.PaperAdventure.asVanilla(name);
+        for (EntityPlayer player : server.getHandle().players) {
+            if (player.getBukkitEntity().canSee(this)) {
+                player.playerConnection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.UPDATE_DISPLAY_NAME, getHandle()));
+            }
+        }
+    }
+    @Override
+    public net.kyori.adventure.text.Component playerListName() {
+        return getHandle().listName == null ? net.kyori.adventure.text.Component.text(getName()) : io.papermc.paper.adventure.PaperAdventure.asAdventure(getHandle().listName);
+    }
+    @Override
+    public net.kyori.adventure.text.Component playerListHeader() {
+        return playerListHeader;
+    }
+    @Override
+    public net.kyori.adventure.text.Component playerListFooter() {
+        return playerListFooter;
+    }
+    // Paper end
     @Override
     public String getPlayerListName() {
         return getHandle().listName == null ? getName() : CraftChatMessage.fromComponent(getHandle().listName);
@@ -266,35 +291,35 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         }
     }
 
-    private IChatBaseComponent playerListHeader;
-    private IChatBaseComponent playerListFooter;
+    private net.kyori.adventure.text.Component playerListHeader; // Paper - Adventure
+    private net.kyori.adventure.text.Component playerListFooter; // Paper - Adventure
 
     @Override
     public String getPlayerListHeader() {
-        return (playerListHeader == null) ? null : CraftChatMessage.fromComponent(playerListHeader);
+        return (playerListHeader == null) ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(playerListHeader); // Paper - Adventure
     }
 
     @Override
     public String getPlayerListFooter() {
-        return (playerListFooter == null) ? null : CraftChatMessage.fromComponent(playerListFooter);
+        return (playerListFooter == null) ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(playerListFooter); // Paper - Adventure
     }
 
     @Override
     public void setPlayerListHeader(String header) {
-        this.playerListHeader = CraftChatMessage.fromStringOrNull(header, true);
+        this.playerListHeader = header == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(header); // Paper - Adventure
         updatePlayerListHeaderFooter();
     }
 
     @Override
     public void setPlayerListFooter(String footer) {
-        this.playerListFooter = CraftChatMessage.fromStringOrNull(footer, true);
+        this.playerListFooter = footer == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(footer); // Paper - Adventure
         updatePlayerListHeaderFooter();
     }
 
     @Override
     public void setPlayerListHeaderFooter(String header, String footer) {
-        this.playerListHeader = CraftChatMessage.fromStringOrNull(header, true);
-        this.playerListFooter = CraftChatMessage.fromStringOrNull(footer, true);
+        this.playerListHeader = header == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(header); // Paper - Adventure
+        this.playerListFooter = footer == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(footer); // Paper - Adventure
         updatePlayerListHeaderFooter();
     }
 
@@ -302,8 +327,8 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         if (getHandle().playerConnection == null) return;
 
         PacketPlayOutPlayerListHeaderFooter packet = new PacketPlayOutPlayerListHeaderFooter();
-        packet.header = (this.playerListHeader == null) ? new ChatComponentText("") : this.playerListHeader;
-        packet.footer = (this.playerListFooter == null) ? new ChatComponentText("") : this.playerListFooter;
+        packet.header = (this.playerListHeader == null) ? new ChatComponentText("") : io.papermc.paper.adventure.PaperAdventure.asVanilla(this.playerListHeader); // Paper - Adventure
+        packet.footer = (this.playerListFooter == null) ? new ChatComponentText("") : io.papermc.paper.adventure.PaperAdventure.asVanilla(this.playerListFooter); // Paper - Adventure
         getHandle().playerConnection.sendPacket(packet);
     }
 
@@ -335,6 +360,17 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         getHandle().playerConnection.disconnect(message == null ? "" : message);
     }
 
+    // Paper start
+    @Override
+    public void kick(final net.kyori.adventure.text.Component message) {
+        org.spigotmc.AsyncCatcher.catchOp("player kick");
+        final PlayerConnection connection = this.getHandle().playerConnection;
+        if (connection != null) {
+            connection.disconnect(message == null ? net.kyori.adventure.text.Component.empty() : message);
+        }
+    }
+    // Paper end
+
     @Override
     public void setCompassTarget(Location loc) {
         if (getHandle().playerConnection == null) return;
@@ -561,6 +597,37 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         getHandle().playerConnection.sendPacket(packet);
     }
 
+    // Paper start
+    @Override
+    public void sendSignChange(Location loc, List<net.kyori.adventure.text.Component> lines) {
+        this.sendSignChange(loc, lines, org.bukkit.DyeColor.BLACK);
+    }
+    @Override
+    public void sendSignChange(Location loc, List<net.kyori.adventure.text.Component> lines, DyeColor dyeColor) {
+        if (getHandle().playerConnection == null) {
+            return;
+        }
+        if (lines == null) {
+            lines = new java.util.ArrayList<>(4);
+        }
+        Validate.notNull(loc, "Location cannot be null");
+        Validate.notNull(dyeColor, "DyeColor cannot be null");
+        if (lines.size() < 4) {
+            throw new IllegalArgumentException("Must have at least 4 lines");
+        }
+        IChatBaseComponent[] components = CraftSign.sanitizeLines(lines);
+        this.sendSignChange0(components, loc, dyeColor);
+    }
+
+    private void sendSignChange0(IChatBaseComponent[] components, Location loc, DyeColor dyeColor) {
+        TileEntitySign sign = new TileEntitySign();
+        sign.setPosition(new BlockPosition(loc.getBlockX(), loc.getBlockY(), loc.getBlockZ()));
+        sign.setColor(EnumColor.fromColorIndex(dyeColor.getWoolData()));
+        System.arraycopy(components, 0, sign.lines, 0, sign.lines.length);
+
+        getHandle().playerConnection.sendPacket(sign.getUpdatePacket());
+    }
+    // Paper end
     @Override
     public void sendSignChange(Location loc, String[] lines) {
        sendSignChange(loc, lines, DyeColor.BLACK);
@@ -583,12 +650,13 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         }
 
         IChatBaseComponent[] components = CraftSign.sanitizeLines(lines);
-        TileEntitySign sign = new TileEntitySign();
+        /*TileEntitySign sign = new TileEntitySign(); // Paper
         sign.setPosition(new BlockPosition(loc.getBlockX(), loc.getBlockY(), loc.getBlockZ()));
         sign.setColor(EnumColor.fromColorIndex(dyeColor.getWoolData()));
         System.arraycopy(components, 0, sign.lines, 0, sign.lines.length);
 
-        getHandle().playerConnection.sendPacket(sign.getUpdatePacket());
+        getHandle().playerConnection.sendPacket(sign.getUpdatePacket());*/ // Paper
+        this.sendSignChange0(components, loc, dyeColor); // Paper
     }
 
     @Override
@@ -1688,6 +1756,12 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         return (getHandle().clientViewDistance == null) ? Bukkit.getViewDistance() : getHandle().clientViewDistance;
     }
 
+    // Paper start
+    @Override
+    public java.util.Locale locale() {
+        return getHandle().adventure$locale;
+    }
+    // Paper end
     @Override
     public int getPing() {
         return getHandle().ping;
@@ -1716,6 +1790,138 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         getInventory().setItemInMainHand(hand);
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component displayName() {
+        return this.getHandle().adventure$displayName;
+    }
+
+    @Override
+    public void displayName(final net.kyori.adventure.text.Component displayName) {
+        this.getHandle().adventure$displayName = displayName != null ? displayName : net.kyori.adventure.text.Component.text(this.getName());
+        this.getHandle().displayName = null;
+    }
+
+    @Override
+    public void sendMessage(final net.kyori.adventure.identity.Identity identity, final net.kyori.adventure.text.Component message, final net.kyori.adventure.audience.MessageType type) {
+        final PacketPlayOutChat packet = new PacketPlayOutChat(null, type == net.kyori.adventure.audience.MessageType.CHAT ? net.minecraft.network.chat.ChatMessageType.CHAT : net.minecraft.network.chat.ChatMessageType.SYSTEM, identity.uuid());
+        packet.adventure$message = message;
+        this.getHandle().playerConnection.sendPacket(packet);
+    }
+
+    @Override
+    public void sendActionBar(final net.kyori.adventure.text.Component message) {
+        final PacketPlayOutTitle packet = new PacketPlayOutTitle(PacketPlayOutTitle.EnumTitleAction.ACTIONBAR, null);
+        packet.adventure$text = message;
+        this.getHandle().playerConnection.sendPacket(packet);
+    }
+
+    @Override
+    public void sendPlayerListHeader(final net.kyori.adventure.text.Component header) {
+        this.playerListHeader = header;
+        this.adventure$sendPlayerListHeaderAndFooter();
+    }
+
+    @Override
+    public void sendPlayerListFooter(final net.kyori.adventure.text.Component footer) {
+        this.playerListFooter = footer;
+        this.adventure$sendPlayerListHeaderAndFooter();
+    }
+
+    @Override
+    public void sendPlayerListHeaderAndFooter(final net.kyori.adventure.text.Component header, final net.kyori.adventure.text.Component footer) {
+        this.playerListHeader = header;
+        this.playerListFooter = footer;
+        this.adventure$sendPlayerListHeaderAndFooter();
+    }
+
+    private void adventure$sendPlayerListHeaderAndFooter() {
+        final PlayerConnection connection = this.getHandle().playerConnection;
+        if (connection == null) return;
+        final PacketPlayOutPlayerListHeaderFooter packet = new PacketPlayOutPlayerListHeaderFooter();
+        packet.adventure$header = (this.playerListHeader == null) ? net.kyori.adventure.text.Component.empty() : this.playerListHeader;
+        packet.adventure$footer = (this.playerListFooter == null) ? net.kyori.adventure.text.Component.empty() : this.playerListFooter;
+        connection.sendPacket(packet);
+    }
+
+    @Override
+    public void showTitle(final net.kyori.adventure.title.Title title) {
+        final PlayerConnection connection = this.getHandle().playerConnection;
+        final net.kyori.adventure.title.Title.Times times = title.times();
+        if (times != null) {
+            connection.sendPacket(new PacketPlayOutTitle(ticks(times.fadeIn()), ticks(times.stay()), ticks(times.fadeOut())));
+        }
+        final PacketPlayOutTitle sp = new PacketPlayOutTitle(PacketPlayOutTitle.EnumTitleAction.SUBTITLE, null);
+        sp.adventure$text = title.subtitle();
+        connection.sendPacket(sp);
+        final PacketPlayOutTitle tp = new PacketPlayOutTitle(PacketPlayOutTitle.EnumTitleAction.TITLE, null);
+        tp.adventure$text = title.title();
+        connection.sendPacket(tp);
+    }
+
+    private static int ticks(final java.time.Duration duration) {
+        if (duration == null) {
+            return -1;
+        }
+        return (int) (duration.toMillis() / 50L);
+    }
+
+    @Override
+    public void clearTitle() {
+        this.getHandle().playerConnection.sendPacket(new PacketPlayOutTitle(PacketPlayOutTitle.EnumTitleAction.CLEAR, null));
+    }
+
+    // resetTitle implemented above
+
+    @Override
+    public void showBossBar(final net.kyori.adventure.bossbar.BossBar bar) {
+        ((net.kyori.adventure.bossbar.HackyBossBarPlatformBridge) bar).paper$playerShow(this);
+    }
+
+    @Override
+    public void hideBossBar(final net.kyori.adventure.bossbar.BossBar bar) {
+        ((net.kyori.adventure.bossbar.HackyBossBarPlatformBridge) bar).paper$playerHide(this);
+    }
+
+    @Override
+    public void playSound(final net.kyori.adventure.sound.Sound sound) {
+        final Vec3D pos = this.getHandle().getPositionVector();
+        this.playSound(sound, pos.x, pos.y, pos.z);
+    }
+
+    @Override
+    public void playSound(final net.kyori.adventure.sound.Sound sound, final double x, final double y, final double z) {
+        final MinecraftKey name = io.papermc.paper.adventure.PaperAdventure.asVanilla(sound.name());
+        final java.util.Optional<net.minecraft.sounds.SoundEffect> event = net.minecraft.core.IRegistry.SOUND_EVENT.getOptional(name);
+        if (event.isPresent()) {
+            this.getHandle().playerConnection.sendPacket(new PacketPlayOutNamedSoundEffect(event.get(), io.papermc.paper.adventure.PaperAdventure.asVanilla(sound.source()), x, y, z, sound.volume(), sound.pitch()));
+        } else {
+            this.getHandle().playerConnection.sendPacket(new PacketPlayOutCustomSoundEffect(name, io.papermc.paper.adventure.PaperAdventure.asVanilla(sound.source()), new Vec3D(x, y, z), sound.volume(), sound.pitch()));
+        }
+    }
+
+    @Override
+    public void stopSound(final net.kyori.adventure.sound.SoundStop stop) {
+        this.getHandle().playerConnection.sendPacket(new PacketPlayOutStopSound(
+            io.papermc.paper.adventure.PaperAdventure.asVanillaNullable(stop.sound()),
+            io.papermc.paper.adventure.PaperAdventure.asVanillaNullable(stop.source())
+        ));
+    }
+
+    @Override
+    public void openBook(final net.kyori.adventure.inventory.Book book) {
+        final java.util.Locale locale = this.getHandle().adventure$locale;
+        final net.minecraft.world.item.ItemStack item = io.papermc.paper.adventure.PaperAdventure.asItemStack(book, locale);
+        final EntityPlayer player = this.getHandle();
+        final PlayerConnection connection = player.playerConnection;
+        final net.minecraft.world.entity.player.PlayerInventory inventory = player.inventory;
+        final int slot = inventory.items.size() + inventory.itemInHandIndex;
+        connection.sendPacket(new net.minecraft.network.protocol.game.PacketPlayOutSetSlot(0, slot, item));
+        connection.sendPacket(new net.minecraft.network.protocol.game.PacketPlayOutOpenBook(net.minecraft.world.EnumHand.MAIN_HAND));
+        connection.sendPacket(new net.minecraft.network.protocol.game.PacketPlayOutSetSlot(0, slot, inventory.getItemInHand()));
+    }
+    // Paper end
+
     // Spigot start
     private final Player.Spigot spigot = new Player.Spigot()
     {
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 8e83eb95ffce62aad10f4d9b259dc5dd076b7640..418becfe2b4fe5ca808f250469bbb46414a5cbc0 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -785,9 +785,9 @@ public class CraftEventFactory {
         return event;
     }
 
-    public static PlayerDeathEvent callPlayerDeathEvent(EntityPlayer victim, List<org.bukkit.inventory.ItemStack> drops, String deathMessage, boolean keepInventory) {
+    public static PlayerDeathEvent callPlayerDeathEvent(EntityPlayer victim, List<org.bukkit.inventory.ItemStack> drops, net.kyori.adventure.text.Component deathMessage, String stringDeathMessage, boolean keepInventory) { // Paper - Adventure
         CraftPlayer entity = victim.getBukkitEntity();
-        PlayerDeathEvent event = new PlayerDeathEvent(entity, drops, victim.getExpReward(), 0, deathMessage);
+        PlayerDeathEvent event = new PlayerDeathEvent(entity, drops, victim.getExpReward(), 0, deathMessage, stringDeathMessage); // Paper - Adventure
         event.setKeepInventory(keepInventory);
         org.bukkit.World world = entity.getWorld();
         Bukkit.getServer().getPluginManager().callEvent(event);
@@ -811,7 +811,7 @@ public class CraftEventFactory {
      * Server methods
      */
     public static ServerListPingEvent callServerListPingEvent(Server craftServer, InetAddress address, String motd, int numPlayers, int maxPlayers) {
-        ServerListPingEvent event = new ServerListPingEvent(address, motd, numPlayers, maxPlayers);
+        ServerListPingEvent event = new ServerListPingEvent(address, craftServer.motd(), numPlayers, maxPlayers); // Paper - Adventure
         craftServer.getPluginManager().callEvent(event);
         return event;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftContainer.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftContainer.java
index 384520dd734449d4e4f5243fbaad5f666b0c965c..614ab2d73db2293116f2272f6cd5c16da446132d 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftContainer.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftContainer.java
@@ -39,6 +39,7 @@ public class CraftContainer extends Container {
 
     private final InventoryView view;
     private InventoryType cachedType;
+    private net.kyori.adventure.text.Component adventure$title; // Paper
     private String cachedTitle;
     private Container delegate;
     private final int cachedSize;
@@ -50,7 +51,9 @@ public class CraftContainer extends Container {
         IInventory top = ((CraftInventory) view.getTopInventory()).getInventory();
         PlayerInventory bottom = (PlayerInventory) ((CraftInventory) view.getBottomInventory()).getInventory();
         cachedType = view.getType();
-        cachedTitle = view.getTitle();
+        this.adventure$title = view.title(); // Paper
+        if (this.adventure$title == null) this.adventure$title = io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(view.getTitle()); // Paper
+        //cachedTitle = view.getTitle(); // Paper - comment
         cachedSize = getSize();
         setupSlots(top, bottom, player);
     }
@@ -77,6 +80,13 @@ public class CraftContainer extends Container {
                 return inventory.getType();
             }
 
+            // Paper start
+            @Override
+            public net.kyori.adventure.text.Component title() {
+                return inventory instanceof CraftInventoryCustom ? ((CraftInventoryCustom.MinecraftInventory) ((CraftInventory) inventory).getInventory()).title() : net.kyori.adventure.text.Component.text(inventory.getType().getDefaultTitle());
+            }
+            // Paper end
+
             @Override
             public String getTitle() {
                 return inventory instanceof CraftInventoryCustom ? ((CraftInventoryCustom.MinecraftInventory) ((CraftInventory) inventory).getInventory()).getTitle() : inventory.getType().getDefaultTitle();
@@ -95,7 +105,8 @@ public class CraftContainer extends Container {
 
     @Override
     public boolean c(EntityHuman entityhuman) {
-        if (cachedType == view.getType() && cachedSize == getSize() && cachedTitle.equals(view.getTitle())) {
+        if (cachedType == view.getType() && cachedSize == getSize() && this.adventure$title.equals(view.title())) { // Paper
+        //if (cachedType == view.getType() && cachedSize == getSize() && cachedTitle.equals(view.getTitle())) { // Paper - comment
             return true;
         }
         // If the window type has changed for some reason, update the player
@@ -103,7 +114,9 @@ public class CraftContainer extends Container {
         // as good a place as any to put something like this.
         boolean typeChanged = (cachedType != view.getType());
         cachedType = view.getType();
-        cachedTitle = view.getTitle();
+        this.adventure$title = view.title(); // Paper
+        if (this.adventure$title == null) this.adventure$title = io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(view.getTitle()); // Paper
+        //cachedTitle = view.getTitle(); // Paper - comment
         if (view.getPlayer() instanceof CraftPlayer) {
             CraftPlayer player = (CraftPlayer) view.getPlayer();
             Containers<?> type = getNotchInventoryType(view.getTopInventory());
@@ -115,7 +128,8 @@ public class CraftContainer extends Container {
                 setupSlots(top, bottom, player.getHandle());
             }
             int size = getSize();
-            player.getHandle().playerConnection.sendPacket(new PacketPlayOutOpenWindow(this.windowId, type, new ChatComponentText(cachedTitle)));
+            player.getHandle().playerConnection.sendPacket(new PacketPlayOutOpenWindow(this.windowId, type, io.papermc.paper.adventure.PaperAdventure.asVanilla(this.adventure$title))); // Paper
+            //player.getHandle().playerConnection.sendPacket(new PacketPlayOutOpenWindow(this.windowId, type, new ChatComponentText(cachedTitle))); // Paper - comment
             player.updateInventory();
         }
         return true;
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryCustom.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryCustom.java
index a537cc4ac5d052168f96a1ae73b6b17a380436ab..21347cf02cc01c90a81e7dd8264ef11968d9f145 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryCustom.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryCustom.java
@@ -19,6 +19,12 @@ public class CraftInventoryCustom extends CraftInventory {
         super(new MinecraftInventory(owner, type));
     }
 
+    // Paper start
+    public CraftInventoryCustom(InventoryHolder owner, InventoryType type, net.kyori.adventure.text.Component title) {
+        super(new MinecraftInventory(owner, type, title));
+    }
+    // Paper end
+
     public CraftInventoryCustom(InventoryHolder owner, InventoryType type, String title) {
         super(new MinecraftInventory(owner, type, title));
     }
@@ -27,6 +33,12 @@ public class CraftInventoryCustom extends CraftInventory {
         super(new MinecraftInventory(owner, size));
     }
 
+    // Paper start
+    public CraftInventoryCustom(InventoryHolder owner, int size, net.kyori.adventure.text.Component title) {
+        super(new MinecraftInventory(owner, size, title));
+    }
+    // Paper end
+
     public CraftInventoryCustom(InventoryHolder owner, int size, String title) {
         super(new MinecraftInventory(owner, size, title));
     }
@@ -36,9 +48,17 @@ public class CraftInventoryCustom extends CraftInventory {
         private int maxStack = MAX_STACK;
         private final List<HumanEntity> viewers;
         private final String title;
+        private final net.kyori.adventure.text.Component adventure$title; // Paper
         private InventoryType type;
         private final InventoryHolder owner;
 
+        // Paper start
+        public MinecraftInventory(InventoryHolder owner, InventoryType type, net.kyori.adventure.text.Component title) {
+            this(owner, type.getDefaultSize(), title);
+            this.type = type;
+        }
+        // Paper end
+
         public MinecraftInventory(InventoryHolder owner, InventoryType type) {
             this(owner, type.getDefaultSize(), type.getDefaultTitle());
             this.type = type;
@@ -57,11 +77,24 @@ public class CraftInventoryCustom extends CraftInventory {
             Validate.notNull(title, "Title cannot be null");
             this.items = NonNullList.a(size, ItemStack.b);
             this.title = title;
+            this.adventure$title = io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(title);
             this.viewers = new ArrayList<HumanEntity>();
             this.owner = owner;
             this.type = InventoryType.CHEST;
         }
 
+        // Paper start
+        public MinecraftInventory(final InventoryHolder owner, final int size, final net.kyori.adventure.text.Component title) {
+            Validate.notNull(title, "Title cannot be null");
+            this.items = NonNullList.a(size, ItemStack.b);
+            this.title = io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(title);
+            this.adventure$title = title;
+            this.viewers = new ArrayList<HumanEntity>();
+            this.owner = owner;
+            this.type = InventoryType.CHEST;
+        }
+        // Paper end
+
         @Override
         public int getSize() {
             return items.size();
@@ -183,6 +216,12 @@ public class CraftInventoryCustom extends CraftInventory {
             return null;
         }
 
+        // Paper start
+        public net.kyori.adventure.text.Component title() {
+            return this.adventure$title;
+        }
+        // Paper end
+
         public String getTitle() {
             return title;
         }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryView.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryView.java
index 04073ed45f8068d80e58d3927b5ebc3160c6a8c6..9949bb8cac73b2f1f02b51079c0e244f923af8e9 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryView.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryView.java
@@ -64,6 +64,13 @@ public class CraftInventoryView extends InventoryView {
         return CraftItemStack.asCraftMirror(container.getSlot(slot).getItem());
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component title() {
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(this.container.getTitle());
+    }
+    // Paper end
+
     @Override
     public String getTitle() {
         return CraftChatMessage.fromComponent(container.getTitle());
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
index 89a3617068421bb86baf4e8bfd9df2d0626adff7..ccd27aa93b4ab1dc09a8d684b43b5ecb69100ed8 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
@@ -334,4 +334,17 @@ public final class CraftItemFactory implements ItemFactory {
     public Material updateMaterial(ItemMeta meta, Material material) throws IllegalArgumentException {
         return ((CraftMetaItem) meta).updateMaterial(material);
     }
+
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.event.HoverEvent<net.kyori.adventure.text.event.HoverEvent.ShowItem> asHoverEvent(final ItemStack item, final java.util.function.UnaryOperator<net.kyori.adventure.text.event.HoverEvent.ShowItem> op) {
+        final net.minecraft.nbt.NBTTagCompound tag = CraftItemStack.asNMSCopy(item).getTag();
+        return net.kyori.adventure.text.event.HoverEvent.showItem(op.apply(net.kyori.adventure.text.event.HoverEvent.ShowItem.of(item.getType().getKey(), item.getAmount(), io.papermc.paper.adventure.PaperAdventure.asBinaryTagHolder(tag))));
+    }
+
+    @Override
+    public net.kyori.adventure.text.@org.jetbrains.annotations.NotNull Component displayName(@org.jetbrains.annotations.NotNull ItemStack itemStack) {
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(CraftItemStack.asNMSCopy(itemStack).displayName());
+    }
+    // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
index ef10c7ab1d615cdba182eca63eb14309339a5314..206c133ebc6c44038585236b0628543b8bed278c 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
@@ -14,10 +14,17 @@ import org.apache.commons.lang.Validate;
 
 public class CraftMerchantCustom extends CraftMerchant {
 
+    @Deprecated // Paper - Adventure
     public CraftMerchantCustom(String title) {
         super(new MinecraftMerchant(title));
         getMerchant().craftMerchant = this;
     }
+    // Paper start
+    public CraftMerchantCustom(net.kyori.adventure.text.Component title) {
+        super(new MinecraftMerchant(title));
+        getMerchant().craftMerchant = this;
+    }
+    // Paper end
 
     @Override
     public String toString() {
@@ -37,10 +44,17 @@ public class CraftMerchantCustom extends CraftMerchant {
         private World tradingWorld;
         protected CraftMerchant craftMerchant;
 
+        @Deprecated // Paper - Adventure
         public MinecraftMerchant(String title) {
             Validate.notNull(title, "Title cannot be null");
             this.title = new ChatComponentText(title);
         }
+        // Paper start
+        public MinecraftMerchant(net.kyori.adventure.text.Component title) {
+            Validate.notNull(title, "Title cannot be null");
+            this.title = io.papermc.paper.adventure.PaperAdventure.asVanilla(title);
+        }
+        // Paper end
 
         @Override
         public CraftMerchant getCraftMerchant() {
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
index 4cdc504df4cad6f7725f6d18482e88433523943a..65b6d32e3e1130a64df33082f3292cb1ce6f500a 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
@@ -1,8 +1,9 @@
 package org.bukkit.craftbukkit.inventory;
 
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableMap.Builder;
 import com.google.common.collect.Lists;
+
+import com.google.common.collect.ImmutableMap; // Paper
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -21,6 +22,7 @@ import org.bukkit.craftbukkit.util.CraftChatMessage;
 import org.bukkit.craftbukkit.util.CraftMagicNumbers;
 import org.bukkit.inventory.meta.BookMeta;
 import org.bukkit.inventory.meta.BookMeta.Generation;
+import org.checkerframework.checker.nullness.qual.NonNull;
 
 // Spigot start
 import static org.spigotmc.ValidateUtils.*;
@@ -269,6 +271,141 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
         this.generation = (generation == null) ? null : generation.ordinal();
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component title() {
+        return this.title == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(this.title);
+    }
+
+    @Override
+    public org.bukkit.inventory.meta.BookMeta title(net.kyori.adventure.text.Component title) {
+        this.setTitle(title == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(title));
+        return this;
+    }
+
+    @Override
+    public net.kyori.adventure.text.Component author() {
+        return this.author == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(this.author);
+    }
+
+    @Override
+    public org.bukkit.inventory.meta.BookMeta author(net.kyori.adventure.text.Component author) {
+        this.setAuthor(author == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(author));
+        return this;
+    }
+
+    @Override
+    public net.kyori.adventure.text.Component page(final int page) {
+        Validate.isTrue(isValidPage(page), "Invalid page number");
+        return this instanceof CraftMetaBookSigned ? net.kyori.adventure.text.serializer.gson.GsonComponentSerializer.gson().deserialize(pages.get(page - 1)) : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(pages.get(page - 1));
+    }
+
+    @Override
+    public void page(final int page, net.kyori.adventure.text.Component data) {
+        if (!isValidPage(page)) {
+            throw new IllegalArgumentException("Invalid page number " + page + "/" + pages.size());
+        }
+        if (data == null) {
+            data = net.kyori.adventure.text.Component.empty();
+        }
+        pages.set(page - 1, this instanceof CraftMetaBookSigned ? net.kyori.adventure.text.serializer.gson.GsonComponentSerializer.gson().serialize(data) : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(data));
+    }
+
+    @Override
+    public List<net.kyori.adventure.text.Component> pages() {
+        if (this.pages == null) return ImmutableList.of();
+        if (this instanceof CraftMetaBookSigned)
+            return pages.stream().map(net.kyori.adventure.text.serializer.gson.GsonComponentSerializer.gson()::deserialize).collect(ImmutableList.toImmutableList());
+        else
+            return pages.stream().map(io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC::deserialize).collect(ImmutableList.toImmutableList());
+    }
+
+    @Override
+    public BookMeta pages(List<net.kyori.adventure.text.Component> pages) {
+        if (this.pages != null) this.pages.clear();
+        for (net.kyori.adventure.text.Component page : pages) {
+            addPages(page);
+        }
+        return this;
+    }
+
+    @Override
+    public BookMeta pages(net.kyori.adventure.text.Component... pages) {
+        if (this.pages != null) this.pages.clear();
+        addPages(pages);
+        return this;
+    }
+
+    @Override
+    public void addPages(net.kyori.adventure.text.Component... pages) {
+        if (this.pages == null) this.pages = new ArrayList<>();
+        for (net.kyori.adventure.text.Component page : pages) {
+            if (this.pages.size() >= MAX_PAGES) {
+                return;
+            }
+
+            if (page == null) {
+                page = net.kyori.adventure.text.Component.empty();
+            }
+
+            this.pages.add(this instanceof CraftMetaBookSigned ? net.kyori.adventure.text.serializer.gson.GsonComponentSerializer.gson().serialize(page) : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(page));
+        }
+    }
+
+    private CraftMetaBook(net.kyori.adventure.text.Component title, net.kyori.adventure.text.Component author, List<net.kyori.adventure.text.Component> pages) {
+        super((org.bukkit.craftbukkit.inventory.CraftMetaItem) org.bukkit.Bukkit.getItemFactory().getItemMeta(org.bukkit.Material.WRITABLE_BOOK));
+        this.title = title == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(title);
+        this.author = author == null ? null : io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.serialize(author);
+        this.pages = pages.subList(0, Math.min(MAX_PAGES, pages.size())).stream().map(io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC::serialize).collect(java.util.stream.Collectors.toList());
+    }
+
+    static final class CraftMetaBookBuilder implements BookMetaBuilder {
+        private net.kyori.adventure.text.Component title = null;
+        private net.kyori.adventure.text.Component author = null;
+        private final List<net.kyori.adventure.text.Component> pages = new java.util.ArrayList<>();
+
+        @Override
+        public BookMetaBuilder title(net.kyori.adventure.text.Component title) {
+            this.title = title;
+            return this;
+        }
+
+        @Override
+        public BookMetaBuilder author(net.kyori.adventure.text.Component author) {
+            this.author = author;
+            return this;
+        }
+
+        @Override
+        public BookMetaBuilder addPage(net.kyori.adventure.text.Component page) {
+            this.pages.add(page);
+            return this;
+        }
+
+        @Override
+        public BookMetaBuilder pages(net.kyori.adventure.text.Component... pages) {
+            java.util.Collections.addAll(this.pages, pages);
+            return this;
+        }
+
+        @Override
+        public BookMetaBuilder pages(java.util.Collection<net.kyori.adventure.text.Component> pages) {
+            this.pages.addAll(pages);
+            return this;
+        }
+
+        @Override
+        public BookMeta build() {
+            return new CraftMetaBook(title, author, pages);
+        }
+    }
+
+    @Override
+    public BookMetaBuilder toBuilder() {
+        return new CraftMetaBookBuilder();
+    }
+
+    // Paper end
     @Override
     public String getPage(final int page) {
         Validate.isTrue(isValidPage(page), "Invalid page number");
@@ -413,7 +550,7 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
     }
 
     @Override
-    Builder<String, Object> serialize(Builder<String, Object> builder) {
+    ImmutableMap.Builder<String, Object> serialize(ImmutableMap.Builder<String, Object> builder) {
         super.serialize(builder);
 
         if (hasTitle()) {
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBookSigned.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBookSigned.java
index 0835541f51e643ae824c197be7100d5849b5e92a..0d58ec9834797ad7b9acaae6353dcf0385c53fd4 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBookSigned.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBookSigned.java
@@ -1,6 +1,6 @@
 package org.bukkit.craftbukkit.inventory;
 
-import com.google.common.collect.ImmutableMap.Builder;
+import com.google.common.collect.ImmutableMap; // Paper
 import java.util.Map;
 import net.minecraft.nbt.NBTTagCompound;
 import org.bukkit.Material;
@@ -84,7 +84,7 @@ class CraftMetaBookSigned extends CraftMetaBook implements BookMeta {
     }
 
     @Override
-    Builder<String, Object> serialize(Builder<String, Object> builder) {
+    ImmutableMap.Builder<String, Object> serialize(ImmutableMap.Builder<String, Object> builder) {
         super.serialize(builder);
         return builder;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index 928328c292a1322cab478bc748761baf8608e4b0..7a11b2ddfa4244459253c918315aaab78ef2eb4a 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -745,6 +745,18 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
         return !(hasDisplayName() || hasLocalizedName() || hasEnchants() || (lore != null) || hasCustomModelData() || hasBlockData() || hasRepairCost() || !unhandledTags.isEmpty() || !persistentDataContainer.isEmpty() || hideFlag != 0 || isUnbreakable() || hasDamage() || hasAttributeModifiers());
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component displayName() {
+        return displayName == null ? null : net.kyori.adventure.text.serializer.gson.GsonComponentSerializer.gson().deserialize(displayName);
+    }
+
+    @Override
+    public void displayName(final net.kyori.adventure.text.Component displayName) {
+        this.displayName = displayName == null ? null : net.kyori.adventure.text.serializer.gson.GsonComponentSerializer.gson().serialize(displayName);
+    }
+    // Paper end
+
     @Override
     public String getDisplayName() {
         return CraftChatMessage.fromJSONComponent(displayName);
@@ -780,6 +792,18 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
         return this.lore != null && !this.lore.isEmpty();
     }
 
+    // Paper start
+    @Override
+    public List<net.kyori.adventure.text.Component> lore() {
+        return this.lore != null ? io.papermc.paper.adventure.PaperAdventure.asAdventureFromJson(this.lore) : null;
+    }
+
+    @Override
+    public void lore(final List<net.kyori.adventure.text.Component> lore) {
+        this.lore = lore != null ? io.papermc.paper.adventure.PaperAdventure.asJson(lore) : null;
+    }
+    // Paper end
+
     @Override
     public boolean hasRepairCost() {
         return repairCost > 0;
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftCustomInventoryConverter.java b/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftCustomInventoryConverter.java
index ed4415f6dd588c08c922efd5beebb3b124beb9d6..78a7ac47f20e84ccd67ff44d0bc7a2f2faa0d476 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftCustomInventoryConverter.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftCustomInventoryConverter.java
@@ -12,6 +12,13 @@ public class CraftCustomInventoryConverter implements CraftInventoryCreator.Inve
         return new CraftInventoryCustom(holder, type);
     }
 
+    // Paper start
+    @Override
+    public Inventory createInventory(InventoryHolder owner, InventoryType type, net.kyori.adventure.text.Component title) {
+        return new CraftInventoryCustom(owner, type, title);
+    }
+    // Paper end
+
     @Override
     public Inventory createInventory(InventoryHolder owner, InventoryType type, String title) {
         return new CraftInventoryCustom(owner, type, title);
@@ -21,6 +28,12 @@ public class CraftCustomInventoryConverter implements CraftInventoryCreator.Inve
         return new CraftInventoryCustom(owner, size);
     }
 
+    // Paper start
+    public Inventory createInventory(InventoryHolder owner, int size, net.kyori.adventure.text.Component title) {
+        return new CraftInventoryCustom(owner, size, title);
+    }
+    // Paper end
+
     public Inventory createInventory(InventoryHolder owner, int size, String title) {
         return new CraftInventoryCustom(owner, size, title);
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftInventoryCreator.java b/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftInventoryCreator.java
index b51321c8dd70a90ab149f456c7ffb4587c4fbd34..94d807c5d09f165c6eedd0a1c4026c2b833806a0 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftInventoryCreator.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftInventoryCreator.java
@@ -43,6 +43,17 @@ public final class CraftInventoryCreator {
         return converterMap.get(type).createInventory(holder, type);
     }
 
+    // Paper start
+    public Inventory createInventory(InventoryHolder holder, InventoryType type, net.kyori.adventure.text.Component title) {
+        // Paper start
+        if (holder != null) {
+            return DEFAULT_CONVERTER.createInventory(holder, type, title);
+        }
+        //noinspection ConstantConditions // Paper end
+        return converterMap.get(type).createInventory(holder, type, title);
+    }
+    // Paper end
+
     public Inventory createInventory(InventoryHolder holder, InventoryType type, String title) {
         return converterMap.get(type).createInventory(holder, type, title);
     }
@@ -51,6 +62,12 @@ public final class CraftInventoryCreator {
         return DEFAULT_CONVERTER.createInventory(holder, size);
     }
 
+    // Paper start
+    public Inventory createInventory(InventoryHolder holder, int size, net.kyori.adventure.text.Component title) {
+        return DEFAULT_CONVERTER.createInventory(holder, size, title);
+    }
+    // Paper end
+
     public Inventory createInventory(InventoryHolder holder, int size, String title) {
         return DEFAULT_CONVERTER.createInventory(holder, size, title);
     }
@@ -59,6 +76,10 @@ public final class CraftInventoryCreator {
 
         Inventory createInventory(InventoryHolder holder, InventoryType type);
 
+        // Paper start
+        Inventory createInventory(InventoryHolder holder, InventoryType type, net.kyori.adventure.text.Component title);
+        // Paper end
+
         Inventory createInventory(InventoryHolder holder, InventoryType type, String title);
     }
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftTileInventoryConverter.java b/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftTileInventoryConverter.java
index f35e66dab9ff63ca05d7e303c71106c0e9971309..2bd4e644ffbde2e1133b25824a2829bc6b33fa84 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftTileInventoryConverter.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/util/CraftTileInventoryConverter.java
@@ -31,6 +31,18 @@ public abstract class CraftTileInventoryConverter implements CraftInventoryCreat
         return getInventory(getTileEntity());
     }
 
+    // Paper start
+    @Override
+    public Inventory createInventory(InventoryHolder owner, InventoryType type, net.kyori.adventure.text.Component title) {
+        IInventory te = getTileEntity();
+        if (te instanceof TileEntityLootable) {
+            ((TileEntityLootable) te).setCustomName(io.papermc.paper.adventure.PaperAdventure.asVanilla(title));
+        }
+
+        return getInventory(te);
+    }
+    // Paper end
+
     @Override
     public Inventory createInventory(InventoryHolder holder, InventoryType type, String title) {
         IInventory te = getTileEntity();
@@ -54,6 +66,15 @@ public abstract class CraftTileInventoryConverter implements CraftInventoryCreat
             return furnace;
         }
 
+        // Paper start
+        @Override
+        public Inventory createInventory(InventoryHolder owner, InventoryType type, net.kyori.adventure.text.Component title) {
+            IInventory tileEntity = getTileEntity();
+            ((TileEntityFurnace) tileEntity).setCustomName(io.papermc.paper.adventure.PaperAdventure.asVanilla(title));
+            return getInventory(tileEntity);
+        }
+        // Paper end
+
         @Override
         public Inventory createInventory(InventoryHolder owner, InventoryType type, String title) {
             IInventory tileEntity = getTileEntity();
@@ -74,6 +95,18 @@ public abstract class CraftTileInventoryConverter implements CraftInventoryCreat
             return new TileEntityBrewingStand();
         }
 
+        // Paper start
+        @Override
+        public Inventory createInventory(InventoryHolder owner, InventoryType type, net.kyori.adventure.text.Component title) {
+            // BrewingStand does not extend TileEntityLootable
+            IInventory tileEntity = getTileEntity();
+            if (tileEntity instanceof TileEntityBrewingStand) {
+                ((TileEntityBrewingStand) tileEntity).setCustomName(io.papermc.paper.adventure.PaperAdventure.asVanilla(title));
+            }
+            return getInventory(tileEntity);
+        }
+        // Paper end
+
         @Override
         public Inventory createInventory(InventoryHolder holder, InventoryType type, String title) {
             // BrewingStand does not extend TileEntityLootable
diff --git a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftObjective.java b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftObjective.java
index 8fedca656af0783f3d97a7ccde3a113f97911084..df3deee12b11508b76c5f8f927fac8db54a7e397 100644
--- a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftObjective.java
+++ b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftObjective.java
@@ -31,6 +31,21 @@ final class CraftObjective extends CraftScoreboardComponent implements Objective
         return objective.getName();
     }
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component displayName() throws IllegalStateException {
+        CraftScoreboard scoreboard = checkState();
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(objective.getDisplayName());
+    }
+    @Override
+    public void displayName(net.kyori.adventure.text.Component displayName) throws IllegalStateException, IllegalArgumentException {
+        if (displayName == null) {
+            displayName = net.kyori.adventure.text.Component.empty();
+        }
+        CraftScoreboard scoreboard = checkState();
+        objective.setDisplayName(io.papermc.paper.adventure.PaperAdventure.asVanilla(displayName));
+    }
+    // Paper end
     @Override
     public String getDisplayName() throws IllegalStateException {
         CraftScoreboard scoreboard = checkState();
diff --git a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java
index 954389b818de93cf0ab046edc5dc032fceea391b..6ea491f6308317059c4bc6735abbdce370df0f34 100644
--- a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java
+++ b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java
@@ -28,6 +28,27 @@ public final class CraftScoreboard implements org.bukkit.scoreboard.Scoreboard {
     public CraftObjective registerNewObjective(String name, String criteria) throws IllegalArgumentException {
         return registerNewObjective(name, criteria, name);
     }
+    // Paper start
+    @Override
+    public CraftObjective registerNewObjective(String name, String criteria, net.kyori.adventure.text.Component displayName) {
+        return registerNewObjective(name, criteria, displayName, org.bukkit.scoreboard.RenderType.INTEGER);
+    }
+    @Override
+    public CraftObjective registerNewObjective(String name, String criteria, net.kyori.adventure.text.Component displayName, RenderType renderType) {
+        if (displayName == null) {
+            displayName = net.kyori.adventure.text.Component.empty();
+        }
+        Validate.notNull(name, "Objective name cannot be null");
+        Validate.notNull(criteria, "Criteria cannot be null");
+        Validate.notNull(displayName, "Display name cannot be null");
+        Validate.notNull(renderType, "RenderType cannot be null");
+        Validate.isTrue(name.length() <= 16, "The name '" + name + "' is longer than the limit of 16 characters");
+        Validate.isTrue(board.getObjective(name) == null, "An objective of name '" + name + "' already exists");
+        CraftCriteria craftCriteria = CraftCriteria.getFromBukkit(criteria);
+        ScoreboardObjective objective = board.registerObjective(name, craftCriteria.criteria, io.papermc.paper.adventure.PaperAdventure.asVanilla(displayName), CraftScoreboardTranslations.fromBukkitRender(renderType));
+        return new CraftObjective(this, objective);
+    }
+    // Paper end
 
     @Override
     public CraftObjective registerNewObjective(String name, String criteria, String displayName) throws IllegalArgumentException {
@@ -36,7 +57,7 @@ public final class CraftScoreboard implements org.bukkit.scoreboard.Scoreboard {
 
     @Override
     public CraftObjective registerNewObjective(String name, String criteria, String displayName, RenderType renderType) throws IllegalArgumentException {
-        Validate.notNull(name, "Objective name cannot be null");
+        /*Validate.notNull(name, "Objective name cannot be null"); // Paper
         Validate.notNull(criteria, "Criteria cannot be null");
         Validate.notNull(displayName, "Display name cannot be null");
         Validate.notNull(renderType, "RenderType cannot be null");
@@ -46,7 +67,8 @@ public final class CraftScoreboard implements org.bukkit.scoreboard.Scoreboard {
 
         CraftCriteria craftCriteria = CraftCriteria.getFromBukkit(criteria);
         ScoreboardObjective objective = board.registerObjective(name, craftCriteria.criteria, CraftChatMessage.fromStringOrNull(displayName), CraftScoreboardTranslations.fromBukkitRender(renderType));
-        return new CraftObjective(this, objective);
+        return new CraftObjective(this, objective);*/ // Paper
+        return registerNewObjective(name, criteria, io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC.deserialize(displayName), renderType); // Paper
     }
 
     @Override
diff --git a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java
index a213c2e3b2680c6d1bd38853580cbdb52ae7779e..c631934fe9d205a06956c900d5b58a1d8a781c19 100644
--- a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java
+++ b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftTeam.java
@@ -29,6 +29,55 @@ final class CraftTeam extends CraftScoreboardComponent implements Team {
 
         return team.getName();
     }
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.Component displayName() throws IllegalStateException {
+        CraftScoreboard scoreboard = checkState();
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(team.getDisplayName());
+    }
+    @Override
+    public void displayName(net.kyori.adventure.text.Component displayName) throws IllegalStateException, IllegalArgumentException {
+        if (displayName == null) displayName = net.kyori.adventure.text.Component.empty();
+        CraftScoreboard scoreboard = checkState();
+        team.setDisplayName(io.papermc.paper.adventure.PaperAdventure.asVanilla(displayName));
+    }
+    @Override
+    public net.kyori.adventure.text.Component prefix() throws IllegalStateException {
+        CraftScoreboard scoreboard = checkState();
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(team.getPrefix());
+    }
+    @Override
+    public void prefix(net.kyori.adventure.text.Component prefix) throws IllegalStateException, IllegalArgumentException {
+        if (prefix == null) prefix = net.kyori.adventure.text.Component.empty();
+        CraftScoreboard scoreboard = checkState();
+        team.setPrefix(io.papermc.paper.adventure.PaperAdventure.asVanilla(prefix));
+    }
+    @Override
+    public net.kyori.adventure.text.Component suffix() throws IllegalStateException {
+        CraftScoreboard scoreboard = checkState();
+        return io.papermc.paper.adventure.PaperAdventure.asAdventure(team.getSuffix());
+    }
+    @Override
+    public void suffix(net.kyori.adventure.text.Component suffix) throws IllegalStateException, IllegalArgumentException {
+        if (suffix == null) suffix = net.kyori.adventure.text.Component.empty();
+        CraftScoreboard scoreboard = checkState();
+        team.setSuffix(io.papermc.paper.adventure.PaperAdventure.asVanilla(suffix));
+    }
+    @Override
+    public net.kyori.adventure.text.format.TextColor color() throws IllegalStateException {
+        CraftScoreboard scoreboard = checkState();
+        if (team.getColor().getHexValue() == null) throw new IllegalStateException("Team colors must have hex values");
+        net.kyori.adventure.text.format.TextColor color = net.kyori.adventure.text.format.TextColor.color(team.getColor().getHexValue());
+        if (!(color instanceof net.kyori.adventure.text.format.NamedTextColor)) throw new IllegalStateException("Team doesn't have a NamedTextColor");
+        return (net.kyori.adventure.text.format.NamedTextColor) color;
+    }
+    @Override
+    public void color(net.kyori.adventure.text.format.NamedTextColor color) {
+        if (color == null) color = net.kyori.adventure.text.format.NamedTextColor.WHITE;
+        CraftScoreboard scoreboard = checkState();
+        team.setColor(io.papermc.paper.adventure.PaperAdventure.asVanilla(color));
+    }
+    // Paper end
 
     @Override
     public String getDisplayName() throws IllegalStateException {
diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java b/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java
index 6a0b4cd36ac54df41642e8499c50e59f2b347b48..666af6cc91bd12ba5d5a846d663a5aabf861fbc4 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftChatMessage.java
@@ -290,6 +290,7 @@ public final class CraftChatMessage {
 
     public static String fromComponent(IChatBaseComponent component) {
         if (component == null) return "";
+        if (component instanceof io.papermc.paper.adventure.AdventureComponent) component = ((io.papermc.paper.adventure.AdventureComponent) component).deepConverted();
         StringBuilder out = new StringBuilder();
 
         boolean hadFormat = false;
diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
index 65131f0977fa55c4761c34ce52720170feb61a72..8f737f63f280c00c1276bd1dc3ecf60448732ca8 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
@@ -59,6 +59,33 @@ public final class CraftMagicNumbers implements UnsafeValues {
 
     private CraftMagicNumbers() {}
 
+    // Paper start
+    @Override
+    public net.kyori.adventure.text.flattener.ComponentFlattener componentFlattener() {
+        return io.papermc.paper.adventure.PaperAdventure.FLATTENER;
+    }
+
+    @Override
+    public net.kyori.adventure.text.serializer.gson.GsonComponentSerializer colorDownsamplingGsonComponentSerializer() {
+        return io.papermc.paper.adventure.PaperAdventure.COLOR_DOWNSAMPLING_GSON;
+    }
+
+    @Override
+    public net.kyori.adventure.text.serializer.gson.GsonComponentSerializer gsonComponentSerializer() {
+        return io.papermc.paper.adventure.PaperAdventure.GSON;
+    }
+
+    @Override
+    public net.kyori.adventure.text.serializer.plain.PlainComponentSerializer plainComponentSerializer() {
+        return io.papermc.paper.adventure.PaperAdventure.PLAIN;
+    }
+
+    @Override
+    public net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer legacyComponentSerializer() {
+        return io.papermc.paper.adventure.PaperAdventure.LEGACY_SECTION_UXRC;
+    }
+    // Paper end
+
     public static IBlockData getBlock(MaterialData material) {
         return getBlock(material.getItemType(), material.getData());
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/util/LazyHashSet.java b/src/main/java/org/bukkit/craftbukkit/util/LazyHashSet.java
index f194cf2663919ea18309a0501ddfab5e2ed639dd..4b110d6c6f22ff7c2fa0fd4b459820797066199d 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/LazyHashSet.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/LazyHashSet.java
@@ -80,7 +80,7 @@ public abstract class LazyHashSet<E> implements Set<E> {
         return this.reference = makeReference();
     }
 
-    abstract Set<E> makeReference();
+    protected abstract Set<E> makeReference(); // Paper - protected
 
     public boolean isLazy() {
         return reference == null;
diff --git a/src/main/java/org/bukkit/craftbukkit/util/LazyPlayerSet.java b/src/main/java/org/bukkit/craftbukkit/util/LazyPlayerSet.java
index e7b9250ebdd0d9034ef18a96a6cacc83e6db69c2..20ee8468bcf305139a51da61f5f9026794da27f6 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/LazyPlayerSet.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/LazyPlayerSet.java
@@ -15,10 +15,15 @@ public class LazyPlayerSet extends LazyHashSet<Player> {
     }
 
     @Override
-    HashSet<Player> makeReference() {
+    protected HashSet<Player> makeReference() { // Paper - protected
         if (reference != null) {
             throw new IllegalStateException("Reference already created!");
         }
+        // Paper start
+        return makePlayerSet(this.server);
+    }
+    public static HashSet<Player> makePlayerSet(final MinecraftServer server) {
+        // Paper end
         List<EntityPlayer> players = server.getPlayerList().players;
         HashSet<Player> reference = new HashSet<Player>(players.size());
         for (EntityPlayer player : players) {