#3850: Prevent some jdk24+ memory/native access warnings

Co-authored-by: Outfluencer <git@outfluencer.dev>

.github/workflows/maven.yml

@@ -4,12 +4,12 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
 
     strategy:
       fail-fast: false
       matrix:
-        java: [8, 11, 17, 21]
+        java: [8, 11, 17, 21, 25-ea]
 
     name: Java ${{ matrix.java }}
 

api/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-api</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-API</name>
@@ -31,6 +31,12 @@
             <version>${project.version}</version>
             <scope>compile</scope>
         </dependency>
+        <dependency>
+            <groupId>net.md-5</groupId>
+            <artifactId>bungeecord-dialog</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+        </dependency>
         <dependency>
             <groupId>net.md-5</groupId>
             <artifactId>bungeecord-event</artifactId>

api/src/main/java/net/md_5/bungee/api/connection/ProxiedPlayer.java

@@ -12,6 +12,7 @@ import net.md_5.bungee.api.SkinConfiguration;
 import net.md_5.bungee.api.Title;
 import net.md_5.bungee.api.chat.BaseComponent;
 import net.md_5.bungee.api.config.ServerInfo;
+import net.md_5.bungee.api.dialog.Dialog;
 import net.md_5.bungee.api.event.ServerConnectEvent;
 import net.md_5.bungee.api.score.Scoreboard;
 import org.jetbrains.annotations.ApiStatus;
@@ -382,4 +383,31 @@ public interface ProxiedPlayer extends Connection, CommandSender
      */
     @ApiStatus.Experimental
     void transfer(String host, int port);
+
+    /**
+     * Gets the client brand of this player.
+     * If the player has not sent a brand packet yet, it will return null.
+     *
+     * @return the brand of the client, or null if not received yet
+     */
+    String getClientBrand();
+
+    /**
+     * Clear the player's open dialog.
+     *
+     * @throws IllegalStateException if the players version is not at least
+     * 1.21.6
+     */
+    @ApiStatus.Experimental
+    void clearDialog();
+
+    /**
+     * Show a dialog to the player.
+     *
+     * @param dialog the dialog to show
+     * @throws IllegalStateException if the players version is not at least
+     * 1.21.6
+     */
+    @ApiStatus.Experimental
+    void showDialog(Dialog dialog);
 }

api/src/main/java/net/md_5/bungee/api/event/CustomClickEvent.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.api.event;
+
+import com.google.gson.JsonElement;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+import net.md_5.bungee.api.plugin.Cancellable;
+import net.md_5.bungee.api.plugin.Event;
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * Called after a {@link ProxiedPlayer} runs a custom action from a chat event
+ * or form submission.
+ */
+@Data
+@ToString(callSuper = false)
+@EqualsAndHashCode(callSuper = false)
+@ApiStatus.Experimental
+public class CustomClickEvent extends Event implements Cancellable
+{
+
+    /**
+     * Player who clicked.
+     */
+    private final ProxiedPlayer player;
+    /**
+     * Custom action ID.
+     */
+    private final String id;
+    /**
+     * The data as submitted.
+     */
+    private final JsonElement data;
+    /**
+     * Cancelled state.
+     */
+    private boolean cancelled;
+}

api/src/main/java/net/md_5/bungee/api/plugin/LibraryLoader.java

@@ -35,6 +35,7 @@ import org.eclipse.aether.transport.http.HttpTransporterFactory;
 class LibraryLoader
 {
 
+    private static final String REPOSITORY_PROPERTY = "net.md_5.bungee.api.plugin.centralURL";
     private final Logger logger;
     private final RepositorySystem repository;
     private final DefaultRepositorySystemSession session;
@@ -68,7 +69,7 @@ class LibraryLoader
         session.setSystemProperties( System.getProperties() );
         session.setReadOnly();
 
-        this.repositories = repository.newResolutionRepositories( session, Arrays.asList( new RemoteRepository.Builder( "central", "default", "https://repo.maven.apache.org/maven2" ).build() ) );
+        this.repositories = repository.newResolutionRepositories( session, Arrays.asList( new RemoteRepository.Builder( "central", "default", System.getProperty( REPOSITORY_PROPERTY, "https://repo.maven.apache.org/maven2" ) ).build() ) );
     }
 
     public ClassLoader createLoader(PluginDescription desc)

api/src/main/java/net/md_5/bungee/util/CaseInsensitiveHashingStrategy.java

@@ -1,22 +1,37 @@
 package net.md_5.bungee.util;
 
-import gnu.trove.strategy.HashingStrategy;
+import it.unimi.dsi.fastutil.Hash;
 import java.util.Locale;
 
-class CaseInsensitiveHashingStrategy implements HashingStrategy
+class CaseInsensitiveHashingStrategy implements Hash.Strategy<String>
 {
 
     static final CaseInsensitiveHashingStrategy INSTANCE = new CaseInsensitiveHashingStrategy();
 
     @Override
-    public int computeHashCode(Object object)
+    public int hashCode(String object)
     {
-        return ( (String) object ).toLowerCase( Locale.ROOT ).hashCode();
+        if ( object == null )
+        {
+            return 0;
+        }
+
+        return object.toLowerCase( Locale.ROOT ).hashCode();
     }
 
     @Override
-    public boolean equals(Object o1, Object o2)
+    public boolean equals(String o1, String o2)
     {
-        return o1.equals( o2 ) || ( o1 instanceof String && o2 instanceof String && ( (String) o1 ).toLowerCase( Locale.ROOT ).equals( ( (String) o2 ).toLowerCase( Locale.ROOT ) ) );
+        if ( o1 == o2 )
+        {
+            return true;
+        }
+
+        if ( o1 == null || o2 == null )
+        {
+            return false;
+        }
+
+        return o1.equals( o2 ) || o1.toLowerCase( Locale.ROOT ).equals( o2.toLowerCase( Locale.ROOT ) );
     }
 }

api/src/main/java/net/md_5/bungee/util/CaseInsensitiveMap.java

@@ -1,9 +1,9 @@
 package net.md_5.bungee.util;
 
-import gnu.trove.map.hash.TCustomHashMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenCustomHashMap;
 import java.util.Map;
 
-public class CaseInsensitiveMap<V> extends TCustomHashMap<String, V>
+public class CaseInsensitiveMap<V> extends Object2ObjectOpenCustomHashMap<String, V>
 {
 
     public CaseInsensitiveMap()
@@ -13,6 +13,6 @@ public class CaseInsensitiveMap<V> extends TCustomHashMap<String, V>
 
     public CaseInsensitiveMap(Map<? extends String, ? extends V> map)
     {
-        super( CaseInsensitiveHashingStrategy.INSTANCE, map );
+        super( map, CaseInsensitiveHashingStrategy.INSTANCE );
     }
 }

api/src/main/java/net/md_5/bungee/util/CaseInsensitiveSet.java

@@ -1,9 +1,9 @@
 package net.md_5.bungee.util;
 
-import gnu.trove.set.hash.TCustomHashSet;
+import it.unimi.dsi.fastutil.objects.ObjectOpenCustomHashSet;
 import java.util.Collection;
 
-public class CaseInsensitiveSet extends TCustomHashSet<String>
+public class CaseInsensitiveSet extends ObjectOpenCustomHashSet<String>
 {
 
     public CaseInsensitiveSet()
@@ -13,6 +13,6 @@ public class CaseInsensitiveSet extends TCustomHashSet<String>
 
     public CaseInsensitiveSet(Collection<? extends String> collection)
     {
-        super( CaseInsensitiveHashingStrategy.INSTANCE, collection );
+        super( collection, CaseInsensitiveHashingStrategy.INSTANCE );
     }
 }

api/src/test/java/net/md_5/bungee/util/CaseInsensitiveTest.java

@@ -13,12 +13,12 @@ public class CaseInsensitiveTest
         CaseInsensitiveMap<Object> map = new CaseInsensitiveMap<>();
 
         map.put( "FOO", obj );
-        assertTrue( map.contains( "foo" ) ); // Assert that contains is case insensitive
+        assertTrue( map.containsKey( "foo" ) ); // Assert that contains is case insensitive
         assertTrue( map.entrySet().iterator().next().getKey().equals( "FOO" ) ); // Assert that case is preserved
 
         // Assert that remove is case insensitive
         map.remove( "FoO" );
-        assertFalse( map.contains( "foo" ) );
+        assertFalse( map.containsKey( "foo" ) );
     }
 
     @Test

bootstrap/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-bootstrap</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-Bootstrap</name>
@@ -48,6 +48,7 @@
                             <Main-Class>net.md_5.bungee.Bootstrap</Main-Class> 
                             <Implementation-Version>${describe}</Implementation-Version>
                             <Specification-Version>${maven.build.timestamp}</Specification-Version>
+                            <Enable-Native-Access>ALL-UNNAMED</Enable-Native-Access>
                         </manifestEntries>
                     </archive>
                 </configuration>

chat/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-chat</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-Chat</name>

chat/src/main/java/net/md_5/bungee/api/chat/BaseComponent.java

@@ -4,6 +4,7 @@ import java.awt.Color;
 import java.util.ArrayList;
 import java.util.List;
 import lombok.AccessLevel;
+import lombok.Data;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.Setter;
@@ -677,11 +678,11 @@ public abstract class BaseComponent
     public String toPlainText()
     {
         StringBuilder builder = new StringBuilder();
-        toPlainText( builder );
+        toPlainText( new LimitedStringVisitor( builder, Short.MAX_VALUE ) );
         return builder.toString();
     }
 
-    void toPlainText(StringBuilder builder)
+    void toPlainText(StringVisitor builder)
     {
         if ( extra != null )
         {
@@ -701,11 +702,11 @@ public abstract class BaseComponent
     public String toLegacyText()
     {
         StringBuilder builder = new StringBuilder();
-        toLegacyText( builder );
+        toLegacyText( new LimitedStringVisitor( builder, Short.MAX_VALUE ) );
         return builder.toString();
     }
 
-    void toLegacyText(StringBuilder builder)
+    void toLegacyText(StringVisitor builder)
     {
         if ( extra != null )
         {
@@ -716,7 +717,7 @@ public abstract class BaseComponent
         }
     }
 
-    void addFormat(StringBuilder builder)
+    void addFormat(StringVisitor builder)
     {
         builder.append( getColor() );
         if ( isBold() )
@@ -740,4 +741,35 @@ public abstract class BaseComponent
             builder.append( ChatColor.MAGIC );
         }
     }
+
+    @FunctionalInterface
+    protected static interface StringVisitor
+    {
+
+        void append(String s);
+
+        default void append(Object obj)
+        {
+            append( String.valueOf( obj ) );
+        }
+    }
+
+    @Data
+    protected static class LimitedStringVisitor implements StringVisitor
+    {
+
+        private final StringBuilder builder;
+        private final int maxLength;
+
+        @Override
+        public void append(String s)
+        {
+            if ( builder.length() >= maxLength )
+            {
+                throw new IllegalArgumentException( "String exceeded maximum length " + maxLength );
+            }
+
+            builder.append( s );
+        }
+    }
 }

chat/src/main/java/net/md_5/bungee/api/chat/ClickEvent.java

@@ -4,12 +4,14 @@ import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 import lombok.ToString;
+import org.jetbrains.annotations.ApiStatus;
 
 @Getter
 @ToString
 @EqualsAndHashCode
 @RequiredArgsConstructor
-public final class ClickEvent
+@ApiStatus.NonExtendable
+public class ClickEvent
 {
 
     /**
@@ -52,11 +54,19 @@ public final class ClickEvent
          * {@link net.md_5.bungee.api.chat.ClickEvent#value} in a book.
          */
         CHANGE_PAGE,
+        /**
+         * Must use subclass ShowDialogClickEvent.
+         */
+        SHOW_DIALOG,
         /**
          * Copy the string given by
          * {@link net.md_5.bungee.api.chat.ClickEvent#value} into the player's
          * clipboard.
          */
-        COPY_TO_CLIPBOARD
+        COPY_TO_CLIPBOARD,
+        /**
+         * Must use subclass {@link ClickEventCustom}.
+         */
+        CUSTOM,
     }
 }

chat/src/main/java/net/md_5/bungee/api/chat/ClickEventCustom.java

@@ -0,0 +1,30 @@
+package net.md_5.bungee.api.chat;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+
+/**
+ * Click event which sends a custom payload to the server.
+ */
+@Data
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class ClickEventCustom extends ClickEvent
+{
+
+    /**
+     * The custom payload.
+     */
+    private final String payload;
+
+    /**
+     * @param id identifier for the event (lower case, no special characters)
+     * @param payload custom payload
+     */
+    public ClickEventCustom(String id, String payload)
+    {
+        super( ClickEvent.Action.CUSTOM, id );
+        this.payload = payload;
+    }
+}

chat/src/main/java/net/md_5/bungee/api/chat/HoverEvent.java

@@ -13,7 +13,6 @@ import net.md_5.bungee.api.chat.hover.content.Content;
 import net.md_5.bungee.api.chat.hover.content.Entity;
 import net.md_5.bungee.api.chat.hover.content.Item;
 import net.md_5.bungee.api.chat.hover.content.Text;
-import net.md_5.bungee.chat.VersionedComponentSerializer;
 import org.jetbrains.annotations.ApiStatus;
 
 @Getter
@@ -73,22 +72,6 @@ public final class HoverEvent
         this.legacy = true;
     }
 
-    @Deprecated
-    public BaseComponent[] getValue()
-    {
-        Content content = contents.get( 0 );
-        if ( content instanceof Text && ( (Text) content ).getValue() instanceof BaseComponent[] )
-        {
-            return (BaseComponent[]) ( (Text) content ).getValue();
-        }
-
-        TextComponent component = new TextComponent( VersionedComponentSerializer.getDefault().toString( content ) );
-        return new BaseComponent[]
-        {
-            component
-        };
-    }
-
     /**
      * Adds a content to this hover event.
      *

chat/src/main/java/net/md_5/bungee/api/chat/KeybindComponent.java

@@ -50,14 +50,14 @@ public final class KeybindComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( getKeybind() );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( getKeybind() );

chat/src/main/java/net/md_5/bungee/api/chat/ScoreComponent.java

@@ -85,14 +85,14 @@ public final class ScoreComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( this.value );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( this.value );

chat/src/main/java/net/md_5/bungee/api/chat/SelectorComponent.java

@@ -69,14 +69,14 @@ public final class SelectorComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( this.selector );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( this.selector );

chat/src/main/java/net/md_5/bungee/api/chat/TextComponent.java

@@ -280,14 +280,14 @@ public final class TextComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( text );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( text );

chat/src/main/java/net/md_5/bungee/api/chat/TranslatableComponent.java

@@ -156,20 +156,20 @@ public final class TranslatableComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         convert( builder, false );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         convert( builder, true );
         super.toLegacyText( builder );
     }
 
-    private void convert(StringBuilder builder, boolean applyFormat)
+    private void convert(StringVisitor builder, boolean applyFormat)
     {
         String trans = TranslationRegistry.INSTANCE.translate( translate );
 

config/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-config</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-Config</name>

dialog/LICENSE

@@ -0,0 +1,28 @@
+BSD 3-Clause License
+
+Copyright (c) 2025, SpigotMC Pty. Ltd.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

dialog/README.md

@@ -0,0 +1,38 @@
+BungeeCord-Dialog
+=================
+
+Highly experimental API, subject to breakage. All contributions welcome, including major refactors/design changes.
+
+Sample Plugin
+-------------
+
+```java
+    private class TestCommand extends Command
+    {
+
+        public TestCommand()
+        {
+            super( "btest" );
+        }
+
+        @Override
+        public void execute(CommandSender sender, String[] args)
+        {
+            ProxiedPlayer player = (ProxiedPlayer) sender;
+
+            Dialog notice = new NoticeDialog( new DialogBase( new ComponentBuilder( "Hello" ).color( ChatColor.RED ).build() ) );
+            player.showDialog( notice );
+
+            notice = new NoticeDialog(
+                    new DialogBase( new ComponentBuilder( "Hello" ).color( ChatColor.RED ).build() )
+                            .inputs(
+                                    Arrays.asList( new TextInput( "first", new ComponentBuilder( "First" ).build() ),
+                                            new TextInput( "second", new ComponentBuilder( "Second" ).build() )
+                                    )
+                            ) )
+                    .action( new ActionButton( new ComponentBuilder( "Submit Button" ).build(), new CustomClickAction( "customform" ) ) );
+
+            player.sendMessage( new ComponentBuilder( "click me" ).event( new ShowDialogClickEvent( notice ) ).build() );
+        }
+    }
+```

dialog/nb-configuration.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project-shared-configuration>
+    <!--
+    This file contains additional configuration written by modules in the NetBeans IDE.
+    The configuration is intended to be shared among all the users of project and
+    therefore it is assumed to be part of version control checkout.
+    Without this configuration present, some functionality in the IDE may be limited or fail altogether.
+    -->
+    <properties xmlns="http://www.netbeans.org/ns/maven-properties-data/1">
+        <!--
+        Properties that influence various parts of the IDE, especially code formatting and the like. 
+        You can copy and paste the single properties, into the pom.xml file and the IDE will pick them up.
+        That way multiple projects can share the same settings (useful for formatting rules for example).
+        Any value defined here will override the pom.xml file value but is only applicable to the current project.
+        -->
+        <org-netbeans-modules-editor-indent.CodeStyle.usedProfile>project</org-netbeans-modules-editor-indent.CodeStyle.usedProfile>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.classDeclBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.classDeclBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.otherBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.otherBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.methodDeclBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.methodDeclBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinMethodCallParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinMethodCallParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSwitchParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSwitchParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinCatchParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinCatchParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinTryParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinTryParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSynchronizedParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSynchronizedParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinArrayInitBrackets>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinArrayInitBrackets>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinWhileParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinWhileParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinIfParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinIfParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinForParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinForParens>
+    </properties>
+</project-shared-configuration>

dialog/pom.xml

@@ -0,0 +1,36 @@
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>net.md-5</groupId>
+        <artifactId>bungeecord-parent</artifactId>
+        <version>1.21-R0.4-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <groupId>net.md-5</groupId>
+    <artifactId>bungeecord-dialog</artifactId>
+    <version>1.21-R0.4-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>BungeeCord-Dialog</name>
+    <description>Minecraft dialog API intended for use with BungeeCord</description>
+    <licenses>
+        <license>
+            <name>BSD-3-Clause</name>
+            <url>https://github.com/SpigotMC/BungeeCord/blob/master/dialog/LICENSE</url>
+            <distribution>repo</distribution>
+        </license>
+    </licenses>
+
+    <dependencies>
+        <dependency>
+            <groupId>net.md-5</groupId>
+            <artifactId>bungeecord-chat</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+</project>

dialog/src/main/java/net/md_5/bungee/api/dialog/ConfirmationDialog.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.api.dialog;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.dialog.action.ActionButton;
+
+/**
+ * Represents a simple dialog with text and two actions at the bottom (default:
+ * "yes", "no").
+ */
+@Data
+@ToString
+@EqualsAndHashCode
+@AllArgsConstructor
+@Accessors(fluent = true)
+public final class ConfirmationDialog implements Dialog
+{
+
+    @NonNull
+    @Accessors(fluent = false)
+    private DialogBase base;
+    /**
+     * The "yes" click action / bottom (appears on the left).
+     */
+    private ActionButton yes;
+    /**
+     * The "no" click action / bottom (appears on the right).
+     */
+    private ActionButton no;
+
+    public ConfirmationDialog(@NonNull DialogBase base)
+    {
+        this( base, null, null );
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/Dialog.java

@@ -0,0 +1,29 @@
+package net.md_5.bungee.api.dialog;
+
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * Represents a dialog GUI.
+ */
+public interface Dialog
+{
+
+    /**
+     * Gets the dialog base which contains the dialog title and other options
+     * common to all types of dialogs.
+     *
+     * @return mutable reference to the dialog base
+     */
+    DialogBase getBase();
+
+    /**
+     * Sets the dialog base.
+     * <br>
+     * For internal use only as this is mandatory and should be specified in the
+     * constructor.
+     *
+     * @param base the new dialog base
+     */
+    @ApiStatus.Internal
+    void setBase(DialogBase base);
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/DialogBase.java

@@ -0,0 +1,84 @@
+package net.md_5.bungee.api.dialog;
+
+import com.google.gson.annotations.SerializedName;
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NonNull;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+import net.md_5.bungee.api.dialog.body.DialogBody;
+import net.md_5.bungee.api.dialog.input.DialogInput;
+
+/**
+ * Represents the title and other options common to all dialogs.
+ */
+@Data
+@AllArgsConstructor
+@Accessors(fluent = true)
+public final class DialogBase
+{
+
+    /**
+     * The mandatory dialog title.
+     */
+    @NonNull
+    private BaseComponent title;
+    /**
+     * The name which is used for any buttons leading to this dialog (eg from a
+     * {@link DialogListDialog}). Otherwise defaults to {@link #title}.
+     */
+    @SerializedName("external_title")
+    private BaseComponent externalTitle;
+    /**
+     * The inputs to the dialog.
+     */
+    private List<DialogInput> inputs;
+    /**
+     * The body elements which make up this dialog.
+     */
+    private List<DialogBody> body;
+    /**
+     * Whether this dialog can be closed with the escape key (default: true).
+     */
+    @SerializedName("can_close_with_escape")
+    private Boolean canCloseWithEscape;
+    /**
+     * Whether this dialog should pause the game in single-player mode (default:
+     * true).
+     */
+    private Boolean pause;
+    /**
+     * Action to take after the a click or submit action is performed on the
+     * dialog (default: close).
+     */
+    @SerializedName("after_action")
+    private AfterAction afterAction;
+
+    public DialogBase(@NonNull BaseComponent title)
+    {
+        this( title, null, null, null, null, null, null );
+    }
+
+    /**
+     * Types of action which may be taken after the dialog.
+     */
+    public enum AfterAction
+    {
+        /**
+         * Close the dialog.
+         */
+        @SerializedName("close")
+        CLOSE,
+        /**
+         * Do nothing.
+         */
+        @SerializedName("none")
+        NONE,
+        /**
+         * Show a waiting for response screen.
+         */
+        @SerializedName("wait_for_response")
+        WAIT_FOR_RESPONSE;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/DialogListDialog.java

@@ -0,0 +1,73 @@
+package net.md_5.bungee.api.dialog;
+
+import com.google.common.base.Preconditions;
+import com.google.gson.annotations.SerializedName;
+import java.util.Arrays;
+import java.util.List;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.dialog.action.ActionButton;
+
+/**
+ * Represents a dialog which contains buttons that link to other dialogs.
+ */
+@Data
+@ToString
+@EqualsAndHashCode
+@Accessors(fluent = true)
+public final class DialogListDialog implements Dialog
+{
+
+    @NonNull
+    @Accessors(fluent = false)
+    private DialogBase base;
+    /**
+     * The child dialogs behind each button.
+     */
+    private List<Dialog> dialogs;
+    /**
+     * The {@link ActionButton} activated when the dialog is exited.
+     */
+    @SerializedName("exit_action")
+    private ActionButton exitAction;
+    /**
+     * The number of columns for the dialog buttons (default: 2).
+     */
+    private Integer columns;
+    /**
+     * The width of the dialog buttons (default: 150, minimum: 1, maximum: 1024).
+     */
+    @SerializedName("button_width")
+    private Integer buttonWidth;
+
+    public DialogListDialog(@NonNull DialogBase base, Dialog... dialogs)
+    {
+        this( base, Arrays.asList( dialogs ), null, null, null );
+    }
+
+    public DialogListDialog(@NonNull DialogBase base, List<Dialog> dialogs, ActionButton exitAction, Integer columns, Integer buttonWidth)
+    {
+        this.base = base;
+        this.dialogs = dialogs;
+        this.exitAction = exitAction;
+        columns( columns );
+        buttonWidth( buttonWidth );
+    }
+
+    public DialogListDialog columns(Integer columns)
+    {
+        Preconditions.checkArgument( columns == null || columns > 0, "At least one column is required" );
+        this.columns = columns;
+        return this;
+    }
+
+    public DialogListDialog buttonWidth(Integer buttonWidth)
+    {
+        Preconditions.checkArgument( buttonWidth == null || ( buttonWidth >= 1 && buttonWidth <= 1024 ), "buttonWidth must be between 1 and 1024" );
+        this.buttonWidth = buttonWidth;
+        return this;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/MultiActionDialog.java

@@ -0,0 +1,64 @@
+package net.md_5.bungee.api.dialog;
+
+import com.google.common.base.Preconditions;
+import com.google.gson.annotations.SerializedName;
+import java.util.Arrays;
+import java.util.List;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.dialog.action.ActionButton;
+
+/**
+ * Represents a dialog with text a list of action buttons grouped into columns
+ * and scrollable if necessary.
+ */
+@Data
+@ToString
+@EqualsAndHashCode
+@Accessors(fluent = true)
+public final class MultiActionDialog implements Dialog
+{
+
+    @NonNull
+    @Accessors(fluent = false)
+    private DialogBase base;
+    /**
+     * The action buttons in the dialog. At least one must be provided.
+     */
+    @NonNull
+    private List<ActionButton> actions;
+    /**
+     * The number of columns for the dialog buttons (default: 2).
+     */
+    private Integer columns;
+    /**
+     * The {@link ActionButton} activated when the dialog is exited.
+     */
+    @SerializedName("exit_action")
+    private ActionButton exitAction;
+
+    public MultiActionDialog(@NonNull DialogBase base, @NonNull ActionButton... actions)
+    {
+        this( base, Arrays.asList( actions ), null, null );
+    }
+
+    public MultiActionDialog(@NonNull DialogBase base, @NonNull List<ActionButton> actions, Integer columns, ActionButton exitAction)
+    {
+        Preconditions.checkArgument( !actions.isEmpty(), "At least one action must be provided" );
+
+        this.base = base;
+        this.actions = actions;
+        columns( columns );
+        this.exitAction = exitAction;
+    }
+
+    public MultiActionDialog columns(Integer columns)
+    {
+        Preconditions.checkArgument( columns == null || columns > 0, "At least one column is required" );
+        this.columns = columns;
+        return this;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/NoticeDialog.java

@@ -0,0 +1,35 @@
+package net.md_5.bungee.api.dialog;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.dialog.action.ActionButton;
+
+/**
+ * Represents a simple dialog with text and one action at the bottom (default:
+ * "OK").
+ */
+@Data
+@ToString
+@EqualsAndHashCode
+@AllArgsConstructor
+@Accessors(fluent = true)
+public final class NoticeDialog implements Dialog
+{
+
+    @NonNull
+    @Accessors(fluent = false)
+    private DialogBase base;
+    /**
+     * The "OK" action button for the dialog.
+     */
+    private ActionButton action;
+
+    public NoticeDialog(DialogBase base)
+    {
+        this( base, null );
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/ServerLinksDialog.java

@@ -0,0 +1,71 @@
+package net.md_5.bungee.api.dialog;
+
+import com.google.common.base.Preconditions;
+import com.google.gson.annotations.SerializedName;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.dialog.action.ActionButton;
+
+/**
+ * Represents a dialog which shows the links configured/sent from the server.
+ */
+@Data
+@ToString
+@EqualsAndHashCode
+@Accessors(fluent = true)
+public final class ServerLinksDialog implements Dialog
+{
+
+    @NonNull
+    @Accessors(fluent = false)
+    private DialogBase base;
+    /**
+     * The optional {@link ActionButton} for this dialog.
+     */
+    @SerializedName("action")
+    private ActionButton action;
+    /**
+     * The {@link ActionButton} activated when the dialog is exited.
+     */
+    @SerializedName("exit_action")
+    private ActionButton exitAction;
+    /**
+     * The number of columns for the dialog buttons (default: 2).
+     */
+    private Integer columns;
+    /**
+     * The width of the dialog buttons (default: 150, minimum: 1, maximum: 1024).
+     */
+    @SerializedName("button_width")
+    private Integer buttonWidth;
+
+    public ServerLinksDialog(@NonNull DialogBase base)
+    {
+        this( base, null, null, null );
+    }
+
+    public ServerLinksDialog(@NonNull DialogBase base, ActionButton action, Integer columns, Integer buttonWidth)
+    {
+        this.base = base;
+        this.action = action;
+        columns( columns );
+        buttonWidth( buttonWidth );
+    }
+
+    public ServerLinksDialog columns(Integer columns)
+    {
+        Preconditions.checkArgument( columns == null || columns > 0, "At least one column is required" );
+        this.columns = columns;
+        return this;
+    }
+
+    public ServerLinksDialog buttonWidth(Integer buttonWidth)
+    {
+        Preconditions.checkArgument( buttonWidth == null || ( buttonWidth >= 1 && buttonWidth <= 1024 ), "buttonWidth must be between 1 and 1024" );
+        this.buttonWidth = buttonWidth;
+        return this;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/action/Action.java

@@ -0,0 +1,6 @@
+package net.md_5.bungee.api.dialog.action;
+
+public interface Action
+{
+
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/action/ActionButton.java

@@ -0,0 +1,54 @@
+package net.md_5.bungee.api.dialog.action;
+
+import com.google.common.base.Preconditions;
+import lombok.Data;
+import lombok.NonNull;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+
+/**
+ * Represents a dialog action which will usually appear as a button.
+ */
+@Data
+@Accessors(fluent = true)
+public class ActionButton
+{
+
+    /**
+     * The text label of the button, mandatory.
+     */
+    @NonNull
+    private BaseComponent label;
+    /**
+     * The hover tooltip of the button.
+     */
+    private BaseComponent tooltip;
+    /**
+     * The width of the button (default: 150, minimum: 1, maximum: 1024).
+     */
+    private Integer width;
+    /**
+     * The action to take.
+     */
+    @NonNull
+    private Action action;
+
+    public ActionButton(@NonNull BaseComponent label, BaseComponent tooltip, Integer width, @NonNull Action action)
+    {
+        this.label = label;
+        this.tooltip = tooltip;
+        setWidth( width );
+        this.action = action;
+    }
+
+    public ActionButton(@NonNull BaseComponent label, @NonNull Action action)
+    {
+        this( label, null, null, action );
+    }
+
+    public void setWidth(Integer width)
+    {
+        Preconditions.checkArgument( width == null || ( width >= 1 && width <= 1024 ), "width must be between 1 and 1024" );
+        this.width = width;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/action/CustomClickAction.java

@@ -0,0 +1,27 @@
+package net.md_5.bungee.api.dialog.action;
+
+import com.google.gson.JsonElement;
+import lombok.Data;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+
+/**
+ * Submits the dialog with the given ID and values as a payload.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+public class CustomClickAction implements Action
+{
+
+    /**
+     * The namespaced key of the submission.
+     */
+    @NonNull
+    private String id;
+    /**
+     * Fields to be added to the submission payload.
+     */
+    private JsonElement additions;
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/action/RunCommandAction.java

@@ -0,0 +1,25 @@
+package net.md_5.bungee.api.dialog.action;
+
+import lombok.Data;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+
+/**
+ * Executes a command. If the command requires a permission
+ * higher than 0, a confirmation dialog will be shown by the client.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+public class RunCommandAction implements Action
+{
+
+    /**
+     * The template to be applied, where variables of the form
+     * <code>$(key)</code> will be replaced by their
+     * {@link net.md_5.bungee.api.dialog.input.DialogInput#key} value.
+     */
+    @NonNull
+    private String template;
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/action/StaticAction.java

@@ -0,0 +1,20 @@
+package net.md_5.bungee.api.dialog.action;
+
+import lombok.Data;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.ClickEvent;
+
+/**
+ * Represents a static dialog action.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+public class StaticAction implements Action
+{
+
+    @NonNull
+    private ClickEvent clickEvent;
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/action/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Contains the different actions/buttons for a {@link net.md_5.bungee.api.dialog.Dialog}.
+ */
+package net.md_5.bungee.api.dialog.action;

dialog/src/main/java/net/md_5/bungee/api/dialog/body/DialogBody.java

@@ -0,0 +1,20 @@
+package net.md_5.bungee.api.dialog.body;
+
+import lombok.Data;
+import lombok.NonNull;
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * Represents the body content of a {@link net.md_5.bungee.api.dialog.Dialog}.
+ */
+@Data
+public abstract class DialogBody
+{
+
+    /**
+     * The internal body type.
+     */
+    @NonNull
+    @ApiStatus.Internal
+    private final String type;
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/body/PlainMessageBody.java

@@ -0,0 +1,49 @@
+package net.md_5.bungee.api.dialog.body;
+
+import com.google.common.base.Preconditions;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+
+/**
+ * Represents a dialog body which consists of text constrained to a certain
+ * width.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class PlainMessageBody extends DialogBody
+{
+
+    /**
+     * The text body.
+     */
+    @NonNull
+    private BaseComponent contents;
+    /**
+     * The maximum width (default: 200, minimum: 1, maximum: 1024).
+     */
+    private Integer width;
+
+    public PlainMessageBody(@NonNull BaseComponent contents)
+    {
+        this( contents, null );
+    }
+
+    public PlainMessageBody(@NonNull BaseComponent contents, Integer width)
+    {
+        super( "minecraft:plain_message" );
+        this.contents = contents;
+        width( width );
+    }
+
+    public void width(Integer width)
+    {
+        Preconditions.checkArgument( width == null || ( width >= 1 && width <= 1024 ), "width must be between 1 and 1024" );
+        this.width = width;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/body/package-info.java

@@ -0,0 +1,5 @@
+/**
+ * Contains the different {@link net.md_5.bungee.api.dialog.Dialog} body content
+ * types.
+ */
+package net.md_5.bungee.api.dialog.body;

dialog/src/main/java/net/md_5/bungee/api/dialog/chat/ShowDialogClickEvent.java

@@ -0,0 +1,42 @@
+package net.md_5.bungee.api.dialog.chat;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import net.md_5.bungee.api.chat.ClickEvent;
+import net.md_5.bungee.api.dialog.Dialog;
+
+/**
+ * Click event which displays either a pre-existing dialog by key or a custom
+ * dialog.
+ */
+@Data
+@EqualsAndHashCode(callSuper = false)
+public class ShowDialogClickEvent extends ClickEvent
+{
+
+    /**
+     * Key for a pre-existing dialog to show.
+     */
+    private String reference;
+    /**
+     * Dialog to show.
+     */
+    private Dialog dialog;
+
+    public ShowDialogClickEvent(String reference)
+    {
+        this( reference, null );
+    }
+
+    public ShowDialogClickEvent(Dialog dialog)
+    {
+        this( null, dialog );
+    }
+
+    private ShowDialogClickEvent(String reference, Dialog dialog)
+    {
+        super( Action.SHOW_DIALOG, null );
+        this.reference = reference;
+        this.dialog = dialog;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/chat/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Contains dialog extensions to the chat API.
+ */
+package net.md_5.bungee.api.dialog.chat;

dialog/src/main/java/net/md_5/bungee/api/dialog/input/BooleanInput.java

@@ -0,0 +1,54 @@
+package net.md_5.bungee.api.dialog.input;
+
+import com.google.gson.annotations.SerializedName;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+
+/**
+ * Represents a checkbox input control.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class BooleanInput extends DialogInput
+{
+
+    /**
+     * The input label.
+     */
+    @NonNull
+    private BaseComponent label;
+    /**
+     * The initial value (default: false/unchecked).
+     */
+    private Boolean initial;
+    /**
+     * The string value to be submitted when true/checked (default: "true").
+     */
+    @SerializedName("on_true")
+    private String onTrue;
+    /**
+     * The string value to be submitted when false/unchecked (default: "false").
+     */
+    @SerializedName("on_false")
+    private String onFalse;
+
+    public BooleanInput(@NonNull String key, @NonNull BaseComponent label)
+    {
+        this( key, label, null, "true", "false" );
+    }
+
+    public BooleanInput(@NonNull String key, @NonNull BaseComponent label, Boolean initial, String onTrue, String onFalse)
+    {
+        super( "minecraft:boolean", key );
+        this.label = label;
+        this.initial = initial;
+        this.onTrue = onTrue;
+        this.onFalse = onFalse;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/input/DialogInput.java

@@ -0,0 +1,29 @@
+package net.md_5.bungee.api.dialog.input;
+
+import lombok.Data;
+import lombok.NonNull;
+import lombok.experimental.Accessors;
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * Represents a type of input which may be displayed/submitted with a form
+ * dialog.
+ */
+@Data
+@Accessors(fluent = true)
+public class DialogInput
+{
+
+    /**
+     * The internal input type.
+     */
+    @NonNull
+    @ApiStatus.Internal
+    private final String type;
+    /**
+     * The key corresponding to this input and associated with the value
+     * submitted.
+     */
+    @NonNull
+    private final String key;
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/input/InputOption.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.api.dialog.input;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NonNull;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+
+/**
+ * Represents an option choice which may form part of a
+ * {@link SingleOptionInput}.
+ */
+@Data
+@AllArgsConstructor
+@Accessors(fluent = true)
+public class InputOption
+{
+
+    /**
+     * The string value associated with this option, to be submitted when
+     * selected.
+     */
+    @NonNull
+    private String id;
+    /**
+     * The text to display for this option.
+     */
+    private BaseComponent display;
+    /**
+     * Whether this option is the one initially selected. Only one option may
+     * have this value as true (default: first option).
+     */
+    private Boolean initial;
+
+    public InputOption(@NonNull String id)
+    {
+        this( id, null, null );
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/input/NumberRangeInput.java

@@ -0,0 +1,103 @@
+package net.md_5.bungee.api.dialog.input;
+
+import com.google.common.base.Preconditions;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+
+/**
+ * Represents a number slider input.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class NumberRangeInput extends DialogInput
+{
+
+    /**
+     * The width of the input (default: 200, minimum: 1, maximum: 1024).
+     */
+    private Integer width;
+    /**
+     * The label of the slider.
+     */
+    @NonNull
+    private BaseComponent label;
+    /**
+     * A translate key used to display the label value (default:
+     * options.generic_value).
+     */
+    private String labelFormat;
+    /**
+     * The start position of the slider (leftmost position).
+     */
+    private float start;
+    /**
+     * The end position of the slider (rightmost position).
+     */
+    private float end;
+    /**
+     * The steps in which the input will be increased or decreased, or null if
+     * no specific steps.
+     */
+    private Float step;
+    /**
+     * The initial value of number input, or null to fall back to the middle.
+     */
+    private Float initial;
+
+    public NumberRangeInput(@NonNull String key, @NonNull BaseComponent label, float start, float end)
+    {
+        this( key, null, label, "options.generic_value", start, end, null, null );
+    }
+
+    public NumberRangeInput(@NonNull String key, @NonNull BaseComponent label, float start, float end, Float step)
+    {
+        this( key, null, label, "options.generic_value", start, end, step, null );
+    }
+
+    public NumberRangeInput(@NonNull String key, @NonNull BaseComponent label, float start, float end, Float step, Float initial)
+    {
+        this( key, null, label, "options.generic_value", start, end, step, initial );
+    }
+
+    public NumberRangeInput(@NonNull String key, Integer width, @NonNull BaseComponent label, String labelFormat, float start, float end, Float step, Float initial)
+    {
+        super( "minecraft:number_range", key );
+        width( width );
+        this.label = label;
+        this.labelFormat = labelFormat;
+        this.start = start;
+        this.end = end;
+        step( step );
+        initial( initial );
+    }
+
+    public NumberRangeInput width(Integer width)
+    {
+        Preconditions.checkArgument( width == null || ( width >= 1 && width <= 1024 ), "with must be between 1 and 1024" );
+        this.width = width;
+        return this;
+    }
+
+    public NumberRangeInput step(Float step)
+    {
+        Preconditions.checkArgument( step == null || step > 0, "step must be null or greater than zero" );
+        this.step = step;
+        return this;
+    }
+
+    public NumberRangeInput initial(Float initial)
+    {
+        // we need to calculate if the initial value is between start and end, regardless of the order
+        float min = Math.min( start, end );
+        float max = Math.max( start, end );
+        Preconditions.checkArgument( initial == null || ( initial >= min && initial <= max ), "initial must be null or between start and end" );
+        this.initial = initial;
+        return this;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/input/SingleOptionInput.java

@@ -0,0 +1,66 @@
+package net.md_5.bungee.api.dialog.input;
+
+import com.google.common.base.Preconditions;
+import com.google.gson.annotations.SerializedName;
+import java.util.Arrays;
+import java.util.List;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+
+/**
+ * Represents a single option (dropdown) input.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class SingleOptionInput extends DialogInput
+{
+
+    /**
+     * The width of the input (default: 200, minimum: 1, maximum: 1024).
+     */
+    private Integer width;
+    /**
+     * The input label.
+     */
+    @NonNull
+    private BaseComponent label;
+    /**
+     * Whether the label is visible (default: true).
+     */
+    @SerializedName("label_visible")
+    private Boolean labelVisible;
+    /**
+     * The non-empty list of options to be selected from.
+     */
+    @NonNull
+    private List<InputOption> options;
+
+    public SingleOptionInput(@NonNull String key, @NonNull BaseComponent label, @NonNull InputOption... options)
+    {
+        this( key, null, label, null, Arrays.asList( options ) );
+    }
+
+    public SingleOptionInput(@NonNull String key, Integer width, @NonNull BaseComponent label, Boolean labelVisible, @NonNull List<InputOption> options)
+    {
+        super( "minecraft:single_option", key );
+        Preconditions.checkArgument( !options.isEmpty(), "At least one option must be provided" );
+
+        width( width );
+        this.label = label;
+        this.labelVisible = labelVisible;
+        this.options = options;
+    }
+
+    public SingleOptionInput width(Integer width)
+    {
+        Preconditions.checkArgument( width == null || ( width >= 1 && width <= 1024 ), "width must be between 1 and 1024" );
+        this.width = width;
+        return this;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/input/TextInput.java

@@ -0,0 +1,110 @@
+package net.md_5.bungee.api.dialog.input;
+
+import com.google.common.base.Preconditions;
+import com.google.gson.annotations.SerializedName;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NoArgsConstructor;
+import lombok.NonNull;
+import lombok.ToString;
+import lombok.experimental.Accessors;
+import net.md_5.bungee.api.chat.BaseComponent;
+
+/**
+ * Represents a textbox input.
+ */
+@Data
+@Accessors(fluent = true)
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class TextInput extends DialogInput
+{
+
+    /**
+     * The width of this text input (default: 200, minimum: 1, maximum: 1024).
+     */
+    private Integer width;
+    /**
+     * The label of this text input.
+     */
+    @NonNull
+    private BaseComponent label;
+    /**
+     * The visibility of this text input's label.
+     */
+    @SerializedName("label_visible")
+    private Boolean labelVisible;
+    /**
+     * The initial value of this text input.
+     */
+    private String initial;
+    /**
+     * The maximum length of the input (default: 32).
+     */
+    @SerializedName("max_length")
+    private Integer maxLength;
+    /**
+     * If present, allows users to input multiple lines.
+     */
+    private Multiline multiline;
+
+    public TextInput(@NonNull String key, @NonNull BaseComponent label)
+    {
+        this( key, null, label, null, null, null, null );
+    }
+
+    public TextInput(@NonNull String key, Integer width, @NonNull BaseComponent label, Boolean labelVisible, String initial, Integer maxLength)
+    {
+        this( key, width, label, labelVisible, initial, maxLength, null );
+    }
+
+    public TextInput(@NonNull String key, Integer width, @NonNull BaseComponent label, Boolean labelVisible, String initial, Integer maxLength, Multiline multiline)
+    {
+        super( "minecraft:text", key );
+        width( width );
+        this.label = label;
+        this.labelVisible = labelVisible;
+        this.initial = initial;
+        this.maxLength = maxLength;
+        this.multiline = multiline;
+    }
+
+    /**
+     * Configuration data for a multiline input.
+     */
+    @Data
+    @NoArgsConstructor
+    @Accessors(fluent = true)
+    public static class Multiline
+    {
+
+        /**
+         * The maximum length of input, or null to disable any limits.
+         */
+        @SerializedName("max_lines")
+        private Integer maxLines;
+        /**
+         * The height of this input (default: 32, minimum: 1, maximum: 512).
+         */
+        private Integer height;
+
+        public Multiline(Integer maxLines, Integer height)
+        {
+            height( height ).maxLines( maxLines );
+        }
+
+        public Multiline height(Integer height)
+        {
+            Preconditions.checkArgument( height == null || height >= 1 && height <= 512, "height must null or be between 1 and 512" );
+            this.height = height;
+            return this;
+        }
+    }
+
+    public TextInput width(Integer width)
+    {
+        Preconditions.checkArgument( width == null || ( width >= 1 && width <= 1024 ), "width must be between 1 and 1024" );
+        this.width = width;
+        return this;
+    }
+}

dialog/src/main/java/net/md_5/bungee/api/dialog/input/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Represents the various input controls which may be present on form dialogs.
+ */
+package net.md_5.bungee.api.dialog.input;

dialog/src/main/java/net/md_5/bungee/api/dialog/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * Contains the core classes for the display of a {@link net.md_5.bungee.api.dialog.Dialog}.
+ */
+package net.md_5.bungee.api.dialog;

event/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-event</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-Event</name>

log/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-log</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-Log</name>
@@ -20,9 +20,9 @@
 
     <dependencies>
         <dependency>
-            <groupId>jline</groupId>
+            <groupId>org.jline</groupId>
             <artifactId>jline</artifactId>
-            <version>2.12.1</version>
+            <version>3.30.4</version>
             <scope>compile</scope>
         </dependency>
         <dependency>

log/src/main/java/net/md_5/bungee/log/BungeeLogger.java

@@ -1,26 +1,18 @@
 package net.md_5.bungee.log;
 
-import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.io.IOException;
 import java.util.logging.FileHandler;
 import java.util.logging.Level;
 import java.util.logging.LogRecord;
 import java.util.logging.Logger;
-import jline.console.ConsoleReader;
+import org.jline.reader.LineReader;
 
 public class BungeeLogger extends Logger
 {
 
     private final LogDispatcher dispatcher = new LogDispatcher( this );
 
-    // CHECKSTYLE:OFF
-    @SuppressWarnings(
-            {
-                "CallToPrintStackTrace", "CallToThreadStartDuringObjectConstruction"
-            })
-    // CHECKSTYLE:ON
-    @SuppressFBWarnings("SC_START_IN_CTOR")
-    public BungeeLogger(String loggerName, String filePattern, ConsoleReader reader)
+    public BungeeLogger(String loggerName, String filePattern, LineReader reader)
     {
         super( loggerName, null );
         setLevel( Level.ALL );

log/src/main/java/net/md_5/bungee/log/ColouredWriter.java

@@ -1,15 +1,15 @@
 package net.md_5.bungee.log;
 
-import java.io.IOException;
 import java.util.logging.Handler;
 import java.util.logging.LogRecord;
 import java.util.regex.Pattern;
-import jline.console.ConsoleReader;
 import lombok.Data;
+import lombok.RequiredArgsConstructor;
 import net.md_5.bungee.api.ChatColor;
-import org.fusesource.jansi.Ansi;
-import org.fusesource.jansi.Ansi.Erase;
+import org.jline.jansi.Ansi;
+import org.jline.reader.LineReader;
 
+@RequiredArgsConstructor
 public class ColouredWriter extends Handler
 {
 
@@ -52,12 +52,7 @@ public class ColouredWriter extends Handler
         compile( ChatColor.RESET, Ansi.ansi().a( Ansi.Attribute.RESET ).toString() ),
     };
     //
-    private final ConsoleReader console;
-
-    public ColouredWriter(ConsoleReader console)
-    {
-        this.console = console;
-    }
+    private final LineReader console;
 
     public void print(String s)
     {
@@ -65,14 +60,7 @@ public class ColouredWriter extends Handler
         {
             s = replacement.pattern.matcher( s ).replaceAll( replacement.replacement );
         }
-        try
-        {
-            console.print( Ansi.ansi().eraseLine( Erase.ALL ).toString() + ConsoleReader.RESET_LINE + s + Ansi.ansi().reset().toString() );
-            console.drawLine();
-            console.flush();
-        } catch ( IOException ex )
-        {
-        }
+        console.printAbove( s + Ansi.ansi().reset().toString() );
     }
 
     @Override

log/src/main/java/net/md_5/bungee/log/ConciseFormatter.java

@@ -18,7 +18,6 @@ public class ConciseFormatter extends Formatter
     private final boolean coloured;
 
     @Override
-    @SuppressWarnings("ThrowableResultIgnored")
     public String format(LogRecord record)
     {
         StringBuilder formatted = new StringBuilder();

module/cmd-alert/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-module</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module-cmd-alert</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>cmd_alert</name>

module/cmd-alert/src/main/java/net/md_5/bungee/module/cmd/alert/CommandAlertRaw.java

@@ -15,7 +15,7 @@ public class CommandAlertRaw extends Command
 
     public CommandAlertRaw()
     {
-        super( "alertraw", "bungeecord.command.alert" );
+        super( "alertraw", "bungeecord.command.alertraw" );
     }
 
     @Override

module/cmd-find/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-module</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module-cmd-find</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>cmd_find</name>

module/cmd-kick/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-module</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module-cmd-kick</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>cmd_kick</name>

module/cmd-list/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-module</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module-cmd-list</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>cmd_list</name>

module/cmd-send/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-module</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module-cmd-send</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>cmd_send</name>

module/cmd-server/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-module</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module-cmd-server</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>cmd_server</name>

module/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>BungeeCord Modules</name>

module/reconnect-yaml/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-module</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-module-reconnect-yaml</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>reconnect_yaml</name>

native/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-native</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-Native</name>

native/src/main/java/net/md_5/bungee/jni/NativeCode.java

@@ -1,6 +1,8 @@
 package net.md_5.bungee.jni;
 
 import com.google.common.io.ByteStreams;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -93,7 +95,31 @@ public final class NativeCode<T>
         return loaded;
     }
 
+    public static boolean hasDirectBuffers()
+    {
+        ByteBuf directBuffer = null;
+        boolean hasMemoryAddress = false;
+        try
+        {
+            directBuffer = Unpooled.directBuffer();
+            hasMemoryAddress = directBuffer.hasMemoryAddress();
+        } finally
+        {
+            if ( directBuffer != null )
+            {
+                directBuffer.release();
+            }
+        }
+
+        return hasMemoryAddress;
+    }
+
     public static boolean isSupported()
+    {
+        return isSupportedPlatformAndArch() && hasDirectBuffers();
+    }
+
+    private static boolean isSupportedPlatformAndArch()
     {
         return "Linux".equals( System.getProperty( "os.name" ) ) && ( isAmd64() || isAarch64() );
     }

nbt/LICENSE

@@ -0,0 +1,28 @@
+BSD 3-Clause License
+
+Copyright (c) 2025, SpigotMC Pty. Ltd.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

nbt/README.md

@@ -0,0 +1,4 @@
+BungeeCord-NBT
+=================
+
+Minimal implementation of NBT for use in BungeeCord

nbt/nb-configuration.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project-shared-configuration>
+    <!--
+    This file contains additional configuration written by modules in the NetBeans IDE.
+    The configuration is intended to be shared among all the users of project and
+    therefore it is assumed to be part of version control checkout.
+    Without this configuration present, some functionality in the IDE may be limited or fail altogether.
+    -->
+    <properties xmlns="http://www.netbeans.org/ns/maven-properties-data/1">
+        <!--
+        Properties that influence various parts of the IDE, especially code formatting and the like. 
+        You can copy and paste the single properties, into the pom.xml file and the IDE will pick them up.
+        That way multiple projects can share the same settings (useful for formatting rules for example).
+        Any value defined here will override the pom.xml file value but is only applicable to the current project.
+        -->
+        <org-netbeans-modules-editor-indent.CodeStyle.usedProfile>project</org-netbeans-modules-editor-indent.CodeStyle.usedProfile>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.classDeclBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.classDeclBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.otherBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.otherBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.methodDeclBracePlacement>NEW_LINE</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.methodDeclBracePlacement>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinMethodCallParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinMethodCallParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSwitchParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSwitchParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinCatchParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinCatchParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinTryParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinTryParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSynchronizedParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinSynchronizedParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinArrayInitBrackets>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinArrayInitBrackets>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinWhileParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinWhileParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinIfParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinIfParens>
+        <org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinForParens>true</org-netbeans-modules-editor-indent.text.x-java.CodeStyle.project.spaceWithinForParens>
+    </properties>
+</project-shared-configuration>

nbt/pom.xml

@@ -0,0 +1,27 @@
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>net.md-5</groupId>
+        <artifactId>bungeecord-parent</artifactId>
+        <version>1.21-R0.4-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <groupId>net.md-5</groupId>
+    <artifactId>bungeecord-nbt</artifactId>
+    <version>1.21-R0.4-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>BungeeCord-NBT</name>
+    <description>Minimal implementation of NBT for use in BungeeCord</description>
+    <licenses>
+        <license>
+            <name>BSD-3-Clause</name>
+            <url>https://github.com/SpigotMC/BungeeCord/blob/master/nbt/LICENSE</url>
+            <distribution>repo</distribution>
+        </license>
+    </licenses>
+</project>

nbt/src/main/java/net/md_5/bungee/nbt/NamedTag.java

@@ -0,0 +1,52 @@
+package net.md_5.bungee.nbt;
+
+import com.google.common.base.Preconditions;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+import net.md_5.bungee.nbt.type.CompoundTag;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class NamedTag implements Tag
+{
+
+    private String name;
+    private TypedTag tag;
+
+    /**
+     * Reads the data of the {@link DataInput} and parses it into this
+     * {@link NamedTag}.
+     *
+     * @param input input to read from
+     * @param limiter limitation of the read data
+     */
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        byte type = input.readByte();
+        name = CompoundTag.readString( input, limiter );
+        tag = Tag.readById( type, input, limiter );
+    }
+
+    /**
+     * Write this {@link NamedTag} into a {@link DataOutput}.
+     *
+     * @param output the output to write to
+     */
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        Preconditions.checkNotNull( name, "name cannot be null" );
+        Preconditions.checkNotNull( tag, "tag cannot be null" );
+
+        output.writeByte( tag.getId() );
+        CompoundTag.writeString( name, output );
+        tag.write( output );
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/Tag.java

@@ -0,0 +1,167 @@
+package net.md_5.bungee.nbt;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInput;
+import java.io.DataInputStream;
+import java.io.DataOutput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.function.Supplier;
+import net.md_5.bungee.nbt.exception.NBTFormatException;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+import net.md_5.bungee.nbt.type.ByteArrayTag;
+import net.md_5.bungee.nbt.type.ByteTag;
+import net.md_5.bungee.nbt.type.CompoundTag;
+import net.md_5.bungee.nbt.type.DoubleTag;
+import net.md_5.bungee.nbt.type.EndTag;
+import net.md_5.bungee.nbt.type.FloatTag;
+import net.md_5.bungee.nbt.type.IntArrayTag;
+import net.md_5.bungee.nbt.type.IntTag;
+import net.md_5.bungee.nbt.type.ListTag;
+import net.md_5.bungee.nbt.type.LongArrayTag;
+import net.md_5.bungee.nbt.type.LongTag;
+import net.md_5.bungee.nbt.type.ShortTag;
+import net.md_5.bungee.nbt.type.StringTag;
+
+public interface Tag
+{
+
+    int OBJECT_HEADER = 8;
+    int ARRAY_HEADER = 12;
+    int STRING_SIZE = 28;
+    int OBJECT_REFERENCE = 4;
+
+    Supplier<? extends TypedTag>[] CONSTRUCTORS = new Supplier[]
+    {
+        EndTag::new,
+        ByteTag::new,
+        ShortTag::new,
+        IntTag::new,
+        LongTag::new,
+        FloatTag::new,
+        DoubleTag::new,
+        ByteArrayTag::new,
+        StringTag::new,
+        ListTag::new,
+        CompoundTag::new,
+        IntArrayTag::new,
+        LongArrayTag::new
+    };
+
+    byte END = 0;
+    byte BYTE = 1;
+    byte SHORT = 2;
+    byte INT = 3;
+    byte LONG = 4;
+    byte FLOAT = 5;
+    byte DOUBLE = 6;
+    byte BYTE_ARRAY = 7;
+    byte STRING = 8;
+    byte LIST = 9;
+    byte COMPOUND = 10;
+    byte INT_ARRAY = 11;
+    byte LONG_ARRAY = 12;
+
+    /**
+     * Reads the data into this tag.
+     *
+     * @param input the input to read from
+     * @param limiter the limiter for this read operation
+     * @throws IOException if an exception occurs during io operations
+     */
+    void read(DataInput input, NBTLimiter limiter) throws IOException;
+
+    /**
+     * Writes this tag into a {@link DataOutput}.
+     *
+     * @param output the output to write to
+     * @throws IOException if an exception occurs during io operations
+     */
+    void write(DataOutput output) throws IOException;
+
+    /**
+     * Reads a {@link Tag} from the given {@link DataInput},
+     * based on the specified tag type, with limitations of the
+     * {@link NBTLimiter}.
+     *
+     * @param id the nbt type
+     * @param input the input to read from
+     * @param limiter the limiter for this read operation
+     * @return the deserialized {@link Tag}
+     * @throws IOException if an exception occurs during io operations
+     */
+    static TypedTag readById(byte id, DataInput input, NBTLimiter limiter) throws IOException
+    {
+        if ( id < END || id > LONG_ARRAY )
+        {
+            throw new NBTFormatException( "Invalid tag id: " + id );
+        }
+
+        TypedTag tag = CONSTRUCTORS[id].get();
+        tag.read( input, limiter );
+        return tag;
+    }
+
+    /**
+     * Reads a {@link NamedTag} from the given {@link DataInput},
+     * with limitations of the {@link NBTLimiter}.
+     *
+     * @param input the data input to read from
+     * @param limiter the limiter for this read operation
+     * @return the deserialized {@link NamedTag}
+     * @throws IOException if an exception occurs during io operations
+     */
+    static NamedTag readNamedTag(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        NamedTag namedTag = new NamedTag();
+        namedTag.read( input, limiter );
+        return namedTag;
+    }
+
+    /**
+     * Serializes the given {@link TypedTag} into a byte array.
+     * This is the inverse operation of {@link #fromByteArray(byte[])}.
+     *
+     * @param tag the tag to convert
+     * @return the serialized byte array
+     * @throws IOException if an exception occurs during io operations
+     */
+    static byte[] toByteArray(TypedTag tag) throws IOException
+    {
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        DataOutputStream dataOutputStream = new DataOutputStream( byteArrayOutputStream );
+        dataOutputStream.writeByte( tag.getId() );
+        tag.write( dataOutputStream );
+        return byteArrayOutputStream.toByteArray();
+    }
+
+    /**
+     * Deserializes the given byte array into a {@link TypedTag}.
+     * This is the inverse operation of {@link #toByteArray(TypedTag)}.
+     *
+     * @param data the byte array to read from
+     * @return the deserialized {@link TypedTag}
+     * @throws IOException if an exception occurs during io operations
+     */
+    static TypedTag fromByteArray(byte[] data) throws IOException
+    {
+        return fromByteArray( data, NBTLimiter.unlimitedSize() );
+    }
+
+    /**
+     * Deserializes the given byte array into a {@link TypedTag},
+     * with limitations of the {@link NBTLimiter}.
+     *
+     * @param data the byte array to read from
+     * @param limiter the limiter for this read operation
+     * @return the deserialized {@link TypedTag}
+     * @throws IOException if an exception occurs during io operations
+     */
+    static TypedTag fromByteArray(byte[] data, NBTLimiter limiter) throws IOException
+    {
+        DataInputStream stream = new DataInputStream( new ByteArrayInputStream( data ) );
+        byte type = stream.readByte();
+        return readById( type, stream, limiter );
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/TypedTag.java

@@ -0,0 +1,12 @@
+package net.md_5.bungee.nbt;
+
+public interface TypedTag extends Tag
+{
+
+    /**
+     * Gets the id of this tag's type.
+     *
+     * @return the id related to this tag's type
+     */
+    byte getId();
+}

nbt/src/main/java/net/md_5/bungee/nbt/exception/NBTException.java

@@ -0,0 +1,10 @@
+package net.md_5.bungee.nbt.exception;
+
+public class NBTException extends RuntimeException
+{
+
+    public NBTException(String message)
+    {
+        super( message );
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/exception/NBTFormatException.java

@@ -0,0 +1,10 @@
+package net.md_5.bungee.nbt.exception;
+
+public class NBTFormatException extends NBTException
+{
+
+    public NBTFormatException(String message)
+    {
+        super( message );
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/exception/NBTLimitException.java

@@ -0,0 +1,10 @@
+package net.md_5.bungee.nbt.exception;
+
+public class NBTLimitException extends NBTException
+{
+
+    public NBTLimitException(String message)
+    {
+        super( message );
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/limit/NBTLimiter.java

@@ -0,0 +1,66 @@
+package net.md_5.bungee.nbt.limit;
+
+import lombok.RequiredArgsConstructor;
+import net.md_5.bungee.nbt.exception.NBTLimitException;
+
+@RequiredArgsConstructor
+public class NBTLimiter
+{
+
+    private static final int MAX_STACK_DEPTH = 512;
+    //
+    private final long maxBytes;
+    private final int maxDepth;
+
+    public static NBTLimiter unlimitedSize()
+    {
+        return new NBTLimiter( Long.MAX_VALUE, MAX_STACK_DEPTH );
+    }
+
+    public NBTLimiter(long maxBytes)
+    {
+        this( maxBytes, MAX_STACK_DEPTH );
+    }
+
+    private long usedBytes;
+    private int depth;
+
+    public void countBytes(long amount)
+    {
+        if ( amount < 0 )
+        {
+            throw new NBTLimitException( "NBT limiter tried to count negative byte amount" );
+        }
+
+        if ( ( usedBytes = Math.addExact( usedBytes, amount ) ) > maxBytes )
+        {
+            throw new NBTLimitException( "NBT tag is to big, bytes > " + maxBytes );
+        }
+    }
+
+    public void countBytes(long amount, long factor)
+    {
+        if ( amount < 0 || factor < 0 )
+        {
+            throw new NBTLimitException( "NBT limiter tried to count negative byte amount" );
+        }
+
+        countBytes( Math.multiplyExact( amount, factor ) );
+    }
+
+    public void push()
+    {
+        if ( ( depth = Math.addExact( depth, 1 ) ) > maxDepth )
+        {
+            throw new NBTLimitException( "NBT tag is to complex, depth > " + maxDepth );
+        }
+    }
+
+    public void pop()
+    {
+        if ( --depth < 0 )
+        {
+            throw new NBTLimitException( "NBT limiter tried to pop depth 0" );
+        }
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/ByteArrayTag.java

@@ -0,0 +1,44 @@
+package net.md_5.bungee.nbt.type;
+
+import com.google.common.base.Preconditions;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ByteArrayTag implements TypedTag
+{
+
+    private byte[] value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + ARRAY_HEADER + Integer.BYTES );
+        int length = input.readInt();
+        limiter.countBytes( length, Byte.BYTES );
+        input.readFully( value = new byte[ length ] );
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        Preconditions.checkNotNull( value, "byte array value cannot be null" );
+        output.writeInt( value.length );
+        output.write( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.BYTE_ARRAY;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/ByteTag.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.nbt.type;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ByteTag implements TypedTag
+{
+
+    private byte value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + Byte.BYTES );
+        value = input.readByte();
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        output.write( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.BYTE;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/CompoundTag.java

@@ -0,0 +1,99 @@
+package net.md_5.bungee.nbt.type;
+
+import com.google.common.base.Preconditions;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.exception.NBTFormatException;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class CompoundTag implements TypedTag
+{
+
+    private static final int MAP_SIZE_IN_BYTES = 48;
+    private static final int MAP_ENTRY_SIZE_IN_BYTES = 32;
+    //
+    private Map<String, TypedTag> value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.push();
+        limiter.countBytes( MAP_SIZE_IN_BYTES );
+        Map<String, TypedTag> map = new LinkedHashMap<>();
+        for ( byte type; ( type = input.readByte() ) != Tag.END; )
+        {
+            String name = readString( input, limiter );
+            TypedTag tag = Tag.readById( type, input, limiter );
+            if ( map.put( name, tag ) == null )
+            {
+                limiter.countBytes( MAP_ENTRY_SIZE_IN_BYTES + OBJECT_REFERENCE );
+            }
+        }
+        limiter.pop();
+        value = map;
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        Preconditions.checkNotNull( value, "compound tag map cannot be null" );
+        for ( Map.Entry<String, TypedTag> entry : value.entrySet() )
+        {
+            String name = entry.getKey();
+            TypedTag tag = entry.getValue();
+            output.writeByte( tag.getId() );
+            if ( tag.getId() == Tag.END )
+            {
+                throw new NBTFormatException( "invalid end tag in compound tag" );
+            }
+            writeString( name, output );
+            tag.write( output );
+        }
+        output.writeByte( 0 );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.COMPOUND;
+    }
+
+    public static String readString(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( STRING_SIZE );
+        String string = input.readUTF();
+        limiter.countBytes( string.length(), Character.BYTES );
+        return string;
+    }
+
+    public static void writeString(String string, DataOutput output) throws IOException
+    {
+        output.writeUTF( string );
+    }
+
+    public TypedTag get(String key)
+    {
+        return value.get( key );
+    }
+
+    public void put(String key, TypedTag tag)
+    {
+        value.put( key, tag );
+    }
+
+    public int size()
+    {
+        return value.size();
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/DoubleTag.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.nbt.type;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class DoubleTag implements TypedTag
+{
+
+    private double value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + Double.BYTES );
+        value = input.readDouble();
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        output.writeDouble( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.DOUBLE;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/EndTag.java

@@ -0,0 +1,34 @@
+package net.md_5.bungee.nbt.type;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+public class EndTag implements TypedTag
+{
+
+    public static final EndTag INSTANCE = new EndTag();
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter)
+    {
+        limiter.countBytes( OBJECT_HEADER );
+    }
+
+    @Override
+    public void write(DataOutput output)
+    {
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.END;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/FloatTag.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.nbt.type;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class FloatTag implements TypedTag
+{
+
+    private float value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + Float.BYTES );
+        value = input.readFloat();
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        output.writeFloat( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.FLOAT;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/IntArrayTag.java

@@ -0,0 +1,52 @@
+package net.md_5.bungee.nbt.type;
+
+import com.google.common.base.Preconditions;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class IntArrayTag implements TypedTag
+{
+
+    private int[] value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + ARRAY_HEADER + Integer.BYTES );
+        int length = input.readInt();
+        limiter.countBytes( length, Integer.BYTES );
+        int[] data = new int[ length ];
+        for ( int i = 0; i < length; i++ )
+        {
+            data[i] = input.readInt();
+        }
+        value = data;
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        Preconditions.checkNotNull( value, "int array value cannot be null" );
+        output.writeInt( value.length );
+        for ( int i : value )
+        {
+            output.writeInt( i );
+        }
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.INT_ARRAY;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/IntTag.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.nbt.type;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class IntTag implements TypedTag
+{
+
+    private int value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + Integer.BYTES );
+        value = input.readInt();
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        output.writeInt( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.INT;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/ListTag.java

@@ -0,0 +1,92 @@
+package net.md_5.bungee.nbt.type;
+
+import com.google.common.base.Preconditions;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.exception.NBTFormatException;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ListTag implements TypedTag
+{
+
+    public static final int LIST_HEADER = 12;
+    //
+    private List<TypedTag> value;
+    private byte listType;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.push();
+        limiter.countBytes( OBJECT_HEADER + LIST_HEADER + ARRAY_HEADER + Byte.BYTES + Integer.BYTES );
+        listType = input.readByte();
+        int length = input.readInt();
+
+        if ( length < 0 )
+        {
+            throw new NBTFormatException( "ListTag length cannot be negative" );
+        }
+
+        if ( listType == Tag.END && length > 0 )
+        {
+            throw new NBTFormatException( "Missing type in ListTag" );
+        }
+
+        limiter.countBytes( length, OBJECT_REFERENCE );
+        List<TypedTag> tagList = new ArrayList<>( length );
+        for ( int i = 0; i < length; i++ )
+        {
+            tagList.add( Tag.readById( listType, input, limiter ) );
+        }
+        limiter.pop();
+
+        value = tagList;
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        Preconditions.checkNotNull( value, "list value cannot be null" );
+        if ( listType == Tag.END && !value.isEmpty() )
+        {
+            throw new NBTFormatException( "Missing type in ListTag" );
+        }
+        output.writeByte( listType );
+        output.writeInt( value.size() );
+        for ( TypedTag tag : value )
+        {
+            if ( tag.getId() != listType )
+            {
+                throw new NBTFormatException( "ListTag type mismatch" );
+            }
+            tag.write( output );
+        }
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.LIST;
+    }
+
+    public TypedTag get(int index)
+    {
+        return value.get( index );
+    }
+
+    public int size()
+    {
+        return value.size();
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/LongArrayTag.java

@@ -0,0 +1,53 @@
+package net.md_5.bungee.nbt.type;
+
+import com.google.common.base.Preconditions;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class LongArrayTag implements TypedTag
+{
+
+    private long[] value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + ARRAY_HEADER + Integer.BYTES );
+        int length = input.readInt();
+        limiter.countBytes( length, Long.BYTES );
+        long[] data = new long[ length ];
+        for ( int i = 0; i < length; i++ )
+        {
+            data[i] = input.readLong();
+        }
+        value = data;
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        Preconditions.checkNotNull( value, "long array value cannot be null" );
+
+        output.writeInt( value.length );
+        for ( long i : value )
+        {
+            output.writeLong( i );
+        }
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.LONG_ARRAY;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/LongTag.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.nbt.type;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class LongTag implements TypedTag
+{
+
+    private long value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + Long.BYTES );
+        value = input.readLong();
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        output.writeLong( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.LONG;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/ShortTag.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.nbt.type;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ShortTag implements TypedTag
+{
+
+    private short value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + Short.BYTES );
+        value = input.readShort();
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        output.writeShort( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.SHORT;
+    }
+}

nbt/src/main/java/net/md_5/bungee/nbt/type/StringTag.java

@@ -0,0 +1,44 @@
+package net.md_5.bungee.nbt.type;
+
+import com.google.common.base.Preconditions;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class StringTag implements TypedTag
+{
+
+    private String value;
+
+    @Override
+    public void read(DataInput input, NBTLimiter limiter) throws IOException
+    {
+        limiter.countBytes( OBJECT_HEADER + STRING_SIZE );
+        String string = input.readUTF();
+        limiter.countBytes( string.length(), Character.BYTES );
+        value = string;
+    }
+
+    @Override
+    public void write(DataOutput output) throws IOException
+    {
+        Preconditions.checkNotNull( value, "string value cannot be null" );
+
+        output.writeUTF( value );
+    }
+
+    @Override
+    public byte getId()
+    {
+        return Tag.STRING;
+    }
+}

nbt/src/test/java/net/md_5/bungee/nbt/NBTLimiterTest.java

@@ -0,0 +1,53 @@
+package net.md_5.bungee.nbt;
+
+import static org.junit.jupiter.api.Assertions.*;
+import java.util.ArrayList;
+import net.md_5.bungee.nbt.exception.NBTLimitException;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+import net.md_5.bungee.nbt.type.ByteArrayTag;
+import net.md_5.bungee.nbt.type.ListTag;
+import org.junit.jupiter.api.Test;
+
+public class NBTLimiterTest
+{
+
+    @Test
+    public void testNbtLimiter()
+    {
+        assertThrows( NBTLimitException.class, () ->
+        {
+            ByteArrayTag byteArrayTag = new ByteArrayTag( new byte[ 1000 ] );
+            byte[] arr = Tag.toByteArray( byteArrayTag );
+            Tag.fromByteArray( arr, new NBTLimiter( 100, 1 ) );
+        } );
+
+        assertDoesNotThrow( () ->
+        {
+            ByteArrayTag byteArrayTag = new ByteArrayTag( new byte[ 1000 ] );
+            byte[] arr = Tag.toByteArray( byteArrayTag );
+            Tag.fromByteArray( arr, new NBTLimiter( 99999999, 1 ) );
+        } );
+    }
+
+    @Test
+    public void testDepth()
+    {
+        assertThrows( NBTLimitException.class, () ->
+        {
+            ListTag root = new ListTag( new ArrayList<>(), Tag.LIST );
+            root.getValue().add( new ListTag( new ArrayList<>(), Tag.LIST ) );
+
+            byte[] arr = Tag.toByteArray( root );
+            Tag.fromByteArray( arr, new NBTLimiter( 100, 1 ) );
+        } );
+
+        assertDoesNotThrow( () ->
+        {
+            ListTag root = new ListTag( new ArrayList<>(), Tag.LIST );
+            root.getValue().add( new ListTag( new ArrayList<>(), Tag.LIST ) );
+
+            byte[] arr = Tag.toByteArray( root );
+            Tag.fromByteArray( arr, new NBTLimiter( 100, 2 ) );
+        } );
+    }
+}

nbt/src/test/java/net/md_5/bungee/nbt/NBTTagTest.java

@@ -0,0 +1,247 @@
+package net.md_5.bungee.nbt;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ThreadLocalRandom;
+import net.md_5.bungee.nbt.exception.NBTFormatException;
+import net.md_5.bungee.nbt.type.ByteArrayTag;
+import net.md_5.bungee.nbt.type.ByteTag;
+import net.md_5.bungee.nbt.type.CompoundTag;
+import net.md_5.bungee.nbt.type.DoubleTag;
+import net.md_5.bungee.nbt.type.EndTag;
+import net.md_5.bungee.nbt.type.FloatTag;
+import net.md_5.bungee.nbt.type.IntArrayTag;
+import net.md_5.bungee.nbt.type.IntTag;
+import net.md_5.bungee.nbt.type.ListTag;
+import net.md_5.bungee.nbt.type.LongArrayTag;
+import net.md_5.bungee.nbt.type.LongTag;
+import net.md_5.bungee.nbt.type.ShortTag;
+import net.md_5.bungee.nbt.type.StringTag;
+import org.junit.jupiter.api.Test;
+
+public class NBTTagTest
+{
+
+    @Test
+    public void testByteTag() throws IOException
+    {
+        byte[] tests = new byte[]
+        {
+            0, Byte.MAX_VALUE, Byte.MIN_VALUE
+        };
+        for ( byte value : tests )
+        {
+            ByteTag byteTag = new ByteTag( value );
+            byte[] deserialized = Tag.toByteArray( byteTag );
+            ByteTag reSerialized = (ByteTag) Tag.fromByteArray( deserialized );
+            assertEquals( byteTag, reSerialized );
+        }
+    }
+
+    @Test
+    public void testShortTag() throws IOException
+    {
+        short[] tests = new short[]
+        {
+            0, Short.MAX_VALUE, Short.MIN_VALUE
+        };
+        for ( short value : tests )
+        {
+            ShortTag tag = new ShortTag( value );
+            byte[] deserialized = Tag.toByteArray( tag );
+            ShortTag reSerialized = (ShortTag) Tag.fromByteArray( deserialized );
+            assertEquals( tag, reSerialized );
+        }
+    }
+
+    @Test
+    public void testIntTag() throws IOException
+    {
+        int[] tests = new int[]
+        {
+            0, Integer.MAX_VALUE, Integer.MIN_VALUE
+        };
+        for ( int value : tests )
+        {
+            IntTag tag = new IntTag( value );
+            byte[] deserialized = Tag.toByteArray( tag );
+            IntTag reSerialized = (IntTag) Tag.fromByteArray( deserialized );
+            assertEquals( tag, reSerialized );
+        }
+    }
+
+    @Test
+    public void testLongTag() throws IOException
+    {
+        long[] tests = new long[]
+        {
+            0, Long.MAX_VALUE, Long.MIN_VALUE
+        };
+        for ( long value : tests )
+        {
+            LongTag tag = new LongTag( value );
+            byte[] deserialized = Tag.toByteArray( tag );
+            LongTag reSerialized = (LongTag) Tag.fromByteArray( deserialized );
+            assertEquals( tag, reSerialized );
+        }
+    }
+
+    @Test
+    public void testDoubleTag() throws IOException
+    {
+        double[] tests = new double[]
+        {
+            0, Double.MAX_VALUE, Double.MIN_VALUE, Double.NaN, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY
+        };
+        for ( double value : tests )
+        {
+            DoubleTag tag = new DoubleTag( value );
+            byte[] deserialized = Tag.toByteArray( tag );
+            DoubleTag reSerialized = (DoubleTag) Tag.fromByteArray( deserialized );
+            assertEquals( tag, reSerialized );
+        }
+    }
+
+    @Test
+    public void testFloatTag() throws IOException
+    {
+        float[] tests = new float[]
+        {
+            0, Float.MAX_VALUE, Float.MIN_VALUE, Float.NaN, Float.POSITIVE_INFINITY, Float.NEGATIVE_INFINITY
+        };
+        for ( float value : tests )
+        {
+            FloatTag tag = new FloatTag( value );
+            byte[] deserialized = Tag.toByteArray( tag );
+            FloatTag reSerialized = (FloatTag) Tag.fromByteArray( deserialized );
+            assertEquals( tag, reSerialized );
+        }
+    }
+
+    @Test
+    public void testStringTag() throws IOException
+    {
+        String[] tests = new String[]
+        {
+            "Outfluencer", "", String.valueOf( System.currentTimeMillis() ), "BungeeCord", new Object().toString()
+        };
+        for ( String value : tests )
+        {
+            StringTag tag = new StringTag( value );
+            byte[] deserialized = Tag.toByteArray( tag );
+            StringTag reSerialized = (StringTag) Tag.fromByteArray( deserialized );
+            assertEquals( tag, reSerialized );
+        }
+    }
+
+    @Test
+    public void testByteArrayTag() throws IOException
+    {
+        byte[] value = new byte[ 1024 ];
+        ThreadLocalRandom.current().nextBytes( value );
+        ByteArrayTag tag = new ByteArrayTag( value );
+        byte[] deserialized = Tag.toByteArray( tag );
+        ByteArrayTag reSerialized = (ByteArrayTag) Tag.fromByteArray( deserialized );
+        assertEquals( tag, reSerialized );
+
+        value = new byte[ 0 ];
+        ThreadLocalRandom.current().nextBytes( value );
+        tag = new ByteArrayTag( value );
+        deserialized = Tag.toByteArray( tag );
+        reSerialized = (ByteArrayTag) Tag.fromByteArray( deserialized );
+        assertEquals( tag, reSerialized );
+    }
+
+    @Test
+    public void testIntArrayTag() throws IOException
+    {
+        int[] value = new int[ 1024 ];
+        for ( int i = 0; i < value.length; i++ )
+        {
+            value[i] = ThreadLocalRandom.current().nextInt();
+        }
+        IntArrayTag tag = new IntArrayTag( value );
+        byte[] deserialized = Tag.toByteArray( tag );
+        IntArrayTag reSerialized = (IntArrayTag) Tag.fromByteArray( deserialized );
+        assertEquals( tag, reSerialized );
+
+        value = new int[ 0 ];
+        tag = new IntArrayTag( value );
+        deserialized = Tag.toByteArray( tag );
+        reSerialized = (IntArrayTag) Tag.fromByteArray( deserialized );
+        assertEquals( tag, reSerialized );
+    }
+
+    @Test
+    public void testLongArrayTag() throws IOException
+    {
+        long[] value = new long[ 1024 ];
+        for ( int i = 0; i < value.length; i++ )
+        {
+            value[i] = ThreadLocalRandom.current().nextLong();
+        }
+        LongArrayTag tag = new LongArrayTag( value );
+        byte[] deserialized = Tag.toByteArray( tag );
+        LongArrayTag reSerialized = (LongArrayTag) Tag.fromByteArray( deserialized );
+        assertEquals( tag, reSerialized );
+
+        value = new long[ 0 ];
+        tag = new LongArrayTag( value );
+        deserialized = Tag.toByteArray( tag );
+        reSerialized = (LongArrayTag) Tag.fromByteArray( deserialized );
+        assertEquals( tag, reSerialized );
+
+    }
+
+    @Test
+    public void testListTag() throws IOException
+    {
+        List<TypedTag> tags = new ArrayList<>();
+        for ( int i = 0; i < 100; i++ )
+        {
+            tags.add( new IntTag( i ) );
+        }
+        ListTag listTag = new ListTag( tags, Tag.INT );
+        byte[] deserialized = Tag.toByteArray( listTag );
+        ListTag reSerialized = (ListTag) Tag.fromByteArray( deserialized );
+        assertEquals( reSerialized.getValue(), tags );
+        List<TypedTag> tags2 = new ArrayList<>();
+        for ( int i = 0; i < 100; i++ )
+        {
+            tags2.add( new IntTag( i ) );
+        }
+        tags2.add( new ByteTag( Byte.MIN_VALUE ) );
+        assertThrows( NBTFormatException.class, () -> Tag.toByteArray( new ListTag( tags2, Tag.INT ) ) );
+        assertThrows( NBTFormatException.class, () -> Tag.toByteArray( new ListTag( Collections.singletonList( new EndTag() ), Tag.END ) ) );
+    }
+
+    @Test
+    public void testCompoundTag() throws IOException
+    {
+        Map<String, TypedTag> map = new HashMap<>();
+        for ( int i = 0; i < 100; i++ )
+        {
+            map.put( "" + i, new IntTag( i ) );
+            map.put( "a" + i, new ByteTag( (byte) i ) );
+            map.put( "b" + i, new ShortTag( (short) i ) );
+            map.put( "c" + i, new LongTag( i ) );
+            map.put( "f" + i, new FloatTag( i ) );
+            map.put( "d" + i, new DoubleTag( i ) );
+        }
+        CompoundTag compoundTag = new CompoundTag( map );
+        byte[] deserialized = Tag.toByteArray( compoundTag );
+        CompoundTag reSerialized = (CompoundTag) Tag.fromByteArray( deserialized );
+        assertEquals( reSerialized, compoundTag );
+        Map<String, TypedTag> map2 = new LinkedHashMap<>();
+        map2.put( "", new EndTag() );
+        CompoundTag compoundTag2 = new CompoundTag( map2 );
+        assertThrows( NBTFormatException.class, () -> Tag.toByteArray( compoundTag2 ) );
+    }
+}

nbt/src/test/java/net/md_5/bungee/nbt/PlayerDataTest.java

@@ -0,0 +1,29 @@
+package net.md_5.bungee.nbt;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertInstanceOf;
+import java.io.DataInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.util.Objects;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+import net.md_5.bungee.nbt.type.CompoundTag;
+import org.junit.jupiter.api.Test;
+
+public class PlayerDataTest
+{
+
+    @Test
+    public void testPlayerData() throws URISyntaxException, IOException
+    {
+        ClassLoader classLoader = PlayerDataTest.class.getClassLoader();
+        File file = new File( Objects.requireNonNull( classLoader.getResource( "playerdata.nbt" ) ).toURI() );
+        FileInputStream fileInputStream = new FileInputStream( file );
+        DataInputStream dis = new DataInputStream( fileInputStream );
+        NamedTag namedTag = Tag.readNamedTag( dis, NBTLimiter.unlimitedSize() );
+        assertInstanceOf( CompoundTag.class, namedTag.getTag() );
+        assertEquals( namedTag.getName(), "" );
+    }
+}

pom.xml

@@ -5,7 +5,7 @@
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-parent</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>BungeeCord-Parent</name>
@@ -35,14 +35,17 @@
         <module>bootstrap</module>
         <module>chat</module>
         <module>config</module>
+        <module>dialog</module>
         <module>event</module>
         <module>log</module>
         <module>module</module>
         <module>protocol</module>
         <module>proxy</module>
         <module>query</module>
+        <module>serializer</module>
         <module>slf4j</module>
         <module>native</module>
+        <module>nbt</module>
     </modules>
 
     <scm>
@@ -72,7 +75,7 @@
 
     <properties>
         <build.number>unknown</build.number>
-        <lombok.version>1.18.36</lombok.version>
+        <lombok.version>1.18.38</lombok.version>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -83,7 +86,7 @@
             <dependency>
                 <groupId>io.netty</groupId>
                 <artifactId>netty-bom</artifactId>
-                <version>4.1.119.Final</version>
+                <version>4.2.1.Final</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -99,15 +102,9 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>33.3.1-jre</version>
+            <version>33.4.8-jre</version>
             <scope>compile</scope>
         </dependency>
-        <dependency>
-            <groupId>com.google.code.findbugs</groupId>
-            <artifactId>findbugs-annotations</artifactId>
-            <version>3.0.1</version>
-            <scope>provided</scope>
-        </dependency>
         <dependency>
             <groupId>org.jetbrains</groupId>
             <artifactId>annotations-java5</artifactId>
@@ -182,7 +179,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>animal-sniffer-maven-plugin</artifactId>
-                <version>1.23</version>
+                <version>1.24</version>
                 <executions>
                     <execution>
                         <phase>process-classes</phase>

protocol/pom.xml

@@ -6,13 +6,13 @@
     <parent>
         <groupId>net.md-5</groupId>
         <artifactId>bungeecord-parent</artifactId>
-        <version>1.21-R0.3-SNAPSHOT</version>
+        <version>1.21-R0.4-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <groupId>net.md-5</groupId>
     <artifactId>bungeecord-protocol</artifactId>
-    <version>1.21-R0.3-SNAPSHOT</version>
+    <version>1.21-R0.4-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>BungeeCord-Protocol</name>
@@ -36,7 +36,13 @@
         </dependency>
         <dependency>
             <groupId>net.md-5</groupId>
-            <artifactId>bungeecord-chat</artifactId>
+            <artifactId>bungeecord-serializer</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.md-5</groupId>
+            <artifactId>bungeecord-nbt</artifactId>
             <version>${project.version}</version>
             <scope>compile</scope>
         </dependency>
@@ -46,15 +52,9 @@
             <scope>compile</scope>
         </dependency>
         <dependency>
-            <groupId>net.sf.trove4j</groupId>
-            <artifactId>core</artifactId>
-            <version>3.1.0</version>
-            <scope>compile</scope>
-        </dependency>
-        <dependency>
-            <groupId>se.llbit</groupId>
-            <artifactId>jo-nbt</artifactId>
-            <version>1.3.0</version>
+            <groupId>it.unimi.dsi</groupId>
+            <artifactId>fastutil-core</artifactId>
+            <version>8.5.15</version>
             <scope>compile</scope>
         </dependency>
     </dependencies>

protocol/src/main/java/net/md_5/bungee/protocol/AbstractPacketHandler.java

@@ -1,7 +1,9 @@
 package net.md_5.bungee.protocol;
 
 import net.md_5.bungee.protocol.packet.BossBar;
+import net.md_5.bungee.protocol.packet.BundleDelimiter;
 import net.md_5.bungee.protocol.packet.Chat;
+import net.md_5.bungee.protocol.packet.ClearDialog;
 import net.md_5.bungee.protocol.packet.ClearTitles;
 import net.md_5.bungee.protocol.packet.ClientChat;
 import net.md_5.bungee.protocol.packet.ClientCommand;
@@ -10,6 +12,7 @@ import net.md_5.bungee.protocol.packet.ClientStatus;
 import net.md_5.bungee.protocol.packet.Commands;
 import net.md_5.bungee.protocol.packet.CookieRequest;
 import net.md_5.bungee.protocol.packet.CookieResponse;
+import net.md_5.bungee.protocol.packet.CustomClickAction;
 import net.md_5.bungee.protocol.packet.DisconnectReportDetails;
 import net.md_5.bungee.protocol.packet.EncryptionRequest;
 import net.md_5.bungee.protocol.packet.EncryptionResponse;
@@ -41,6 +44,8 @@ import net.md_5.bungee.protocol.packet.ScoreboardScoreReset;
 import net.md_5.bungee.protocol.packet.ServerData;
 import net.md_5.bungee.protocol.packet.ServerLinks;
 import net.md_5.bungee.protocol.packet.SetCompression;
+import net.md_5.bungee.protocol.packet.ShowDialog;
+import net.md_5.bungee.protocol.packet.ShowDialogDirect;
 import net.md_5.bungee.protocol.packet.StartConfiguration;
 import net.md_5.bungee.protocol.packet.StatusRequest;
 import net.md_5.bungee.protocol.packet.StatusResponse;
@@ -278,4 +283,24 @@ public abstract class AbstractPacketHandler
     public void handle(ServerLinks serverLinks) throws Exception
     {
     }
+
+    public void handle(ShowDialog showDialog) throws Exception
+    {
+    }
+
+    public void handle(ShowDialogDirect showDialogDirect) throws Exception
+    {
+    }
+
+    public void handle(ClearDialog clearDialog) throws Exception
+    {
+    }
+
+    public void handle(CustomClickAction customClickAction) throws Exception
+    {
+    }
+
+    public void handle(BundleDelimiter bundleDelimiter) throws Exception
+    {
+    }
 }

protocol/src/main/java/net/md_5/bungee/protocol/DefinedPacket.java

@@ -21,10 +21,11 @@ import java.util.function.BiConsumer;
 import lombok.RequiredArgsConstructor;
 import net.md_5.bungee.api.chat.BaseComponent;
 import net.md_5.bungee.api.chat.ComponentStyle;
-import se.llbit.nbt.ErrorTag;
-import se.llbit.nbt.NamedTag;
-import se.llbit.nbt.SpecificTag;
-import se.llbit.nbt.Tag;
+import net.md_5.bungee.nbt.NamedTag;
+import net.md_5.bungee.nbt.Tag;
+import net.md_5.bungee.nbt.TypedTag;
+import net.md_5.bungee.nbt.limit.NBTLimiter;
+import net.md_5.bungee.nbt.type.EndTag;
 
 @RequiredArgsConstructor
 public abstract class DefinedPacket
@@ -116,7 +117,7 @@ public abstract class DefinedPacket
     {
         if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_3 )
         {
-            SpecificTag nbt = (SpecificTag) readTag( buf, protocolVersion );
+            TypedTag nbt = (TypedTag) readTag( buf, protocolVersion );
             JsonElement json = TagUtil.toJson( nbt );
 
             return ChatSerializer.forVersion( protocolVersion ).deserialize( json );
@@ -130,7 +131,7 @@ public abstract class DefinedPacket
 
     public static ComponentStyle readComponentStyle(ByteBuf buf, int protocolVersion)
     {
-        SpecificTag nbt = (SpecificTag) readTag( buf, protocolVersion );
+        TypedTag nbt = (TypedTag) readTag( buf, protocolVersion );
         JsonElement json = TagUtil.toJson( nbt );
 
         return ChatSerializer.forVersion( protocolVersion ).deserializeStyle( json );
@@ -152,8 +153,7 @@ public abstract class DefinedPacket
         if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_3 )
         {
             JsonElement json = ChatSerializer.forVersion( protocolVersion ).toJson( message );
-            SpecificTag nbt = TagUtil.fromJson( json );
-
+            TypedTag nbt = TagUtil.fromJson( json );
             writeTag( nbt, buf, protocolVersion );
         } else
         {
@@ -166,8 +166,7 @@ public abstract class DefinedPacket
     public static void writeComponentStyle(ComponentStyle style, ByteBuf buf, int protocolVersion)
     {
         JsonElement json = ChatSerializer.forVersion( protocolVersion ).toJson( style );
-        SpecificTag nbt = TagUtil.fromJson( json );
-
+        TypedTag nbt = TagUtil.fromJson( json );
         writeTag( nbt, buf, protocolVersion );
     }
 
@@ -455,30 +454,32 @@ public abstract class DefinedPacket
 
     public static Tag readTag(ByteBuf input, int protocolVersion)
     {
-        DataInputStream in = new DataInputStream( new ByteBufInputStream( input ) );
-        Tag tag;
-        if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_2 )
+        return readTag( input, protocolVersion, new NBTLimiter( 1 << 21 ) );
+    }
+
+    public static Tag readTag(ByteBuf input, int protocolVersion, NBTLimiter limiter)
     {
+        DataInputStream in = new DataInputStream( new ByteBufInputStream( input ) );
         try
+        {
+            if ( protocolVersion >= ProtocolConstants.MINECRAFT_1_20_2 )
             {
                 byte type = in.readByte();
                 if ( type == 0 )
                 {
-                    return Tag.END;
+                    return EndTag.INSTANCE;
                 } else
                 {
-                    tag = SpecificTag.read( type, in );
+                    return Tag.readById( type, in, limiter );
                 }
+            }
+            NamedTag namedTag = new NamedTag();
+            namedTag.read( in, limiter );
+            return namedTag;
         } catch ( IOException ex )
         {
-                tag = new ErrorTag( "IOException while reading tag type:\n" + ex.getMessage() );
+            throw new RuntimeException( "Exception reading tag", ex );
         }
-        } else
-        {
-            tag = NamedTag.read( in );
-        }
-        Preconditions.checkArgument( !tag.isError(), "Error reading tag: %s", tag.error() );
-        return tag;
     }
 
     public static void writeTag(Tag tag, ByteBuf output, int protocolVersion)
@@ -486,11 +487,11 @@ public abstract class DefinedPacket
         DataOutputStream out = new DataOutputStream( new ByteBufOutputStream( output ) );
         try
         {
-            if ( tag instanceof SpecificTag )
+            if ( tag instanceof TypedTag )
             {
-                SpecificTag specificTag = (SpecificTag) tag;
-                specificTag.writeType( out );
-                specificTag.write( out );
+                TypedTag typedTag = (TypedTag) tag;
+                out.writeByte( typedTag.getId() );
+                typedTag.write( out );
             } else
             {
                 tag.write( out );

protocol/src/main/java/net/md_5/bungee/protocol/MinecraftDecoder.java

@@ -12,12 +12,17 @@ import lombok.Setter;
 public class MinecraftDecoder extends MessageToMessageDecoder<ByteBuf>
 {
 
+    public MinecraftDecoder(Protocol protocol, boolean server, int protocolVersion)
+    {
+        this( protocol, server, protocolVersion, shouldCopyBuffer( protocol, protocolVersion ) );
+    }
+
     @Getter
-    @Setter
     private Protocol protocol;
     private final boolean server;
     @Setter
     private int protocolVersion;
+    private boolean copyBuffer;
 
     @Override
     protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception
@@ -30,8 +35,7 @@ public class MinecraftDecoder extends MessageToMessageDecoder<ByteBuf>
         }
 
         Protocol.DirectionData prot = ( server ) ? protocol.TO_SERVER : protocol.TO_CLIENT;
-        ByteBuf slice = in.copy(); // Can't slice this one due to EntityMap :(
-
+        ByteBuf slice = ( copyBuffer ) ? in.copy() : in.retainedSlice();
         try
         {
             int packetId = DefinedPacket.readVarInt( in );
@@ -60,4 +64,17 @@ public class MinecraftDecoder extends MessageToMessageDecoder<ByteBuf>
             }
         }
     }
+
+    public void setProtocol(Protocol protocol)
+    {
+        this.protocol = protocol;
+        this.copyBuffer = shouldCopyBuffer( protocol, protocolVersion );
+    }
+
+    private static boolean shouldCopyBuffer(Protocol protocol, int protocolVersion)
+    {
+        // We only use the entity map in game state, we can avoid many buffer copies by checking this
+        // EntityMap is removed for 1.20.2 and up
+        return protocol == Protocol.GAME && protocolVersion < ProtocolConstants.MINECRAFT_1_20_2;
+    }
 }