packets packets packets

build.gradle

@@ -3,7 +3,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.github.jengelman.gradle.plugins:shadow:5.0.0'
+        classpath 'com.github.jengelman.gradle.plugins:shadow:5.2.0'
     }
 }
 

proxy/src/main/java/com/velocitypowered/proxy/connection/MinecraftSessionHandler.java

@@ -40,39 +40,30 @@ public interface MinecraftSessionHandler {
   }
 
   default void handleGeneric(Packet packet) {
-
   }
 
   default void handleUnknown(ByteBuf buf) {
-
   }
 
   default void connected() {
-
   }
 
   default void disconnected() {
-
   }
 
   default void activated() {
-
   }
 
   default void deactivated() {
-
   }
 
   default void exception(Throwable throwable) {
-
   }
 
   default void writabilityChanged() {
-
   }
 
   default void readCompleted() {
-
   }
 
   default boolean handle(AvailableCommandsPacket commands) {
@@ -123,14 +114,6 @@ public interface MinecraftSessionHandler {
     return false;
   }
 
-  default boolean handle(LegacyHandshakePacket packet) {
-    return false;
-  }
-
-  default boolean handle(LegacyPingPacket packet) {
-    return false;
-  }
-
   default boolean handle(LoginPluginMessagePacket packet) {
     return false;
   }
@@ -194,4 +177,14 @@ public interface MinecraftSessionHandler {
   default boolean handle(ResourcePackResponsePacket packet) {
     return false;
   }
+
+  // Legacy
+
+  default boolean handle(LegacyHandshakePacket packet) {
+    return false;
+  }
+
+  default boolean handle(LegacyPingPacket packet) {
+    return false;
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/connection/forge/legacy/LegacyForgeUtil.java

@@ -72,9 +72,9 @@ class LegacyForgeUtil {
    * @return A copy of the reset packet
    */
   static PluginMessagePacket resetPacket() {
-    PluginMessagePacket msg = new PluginMessagePacket();
+    return new PluginMessagePacket(
-    msg.setChannel(FORGE_LEGACY_HANDSHAKE_CHANNEL);
+        FORGE_LEGACY_HANDSHAKE_CHANNEL,
-    msg.replace(Unpooled.wrappedBuffer(FORGE_LEGACY_HANDSHAKE_RESET_DATA.clone()));
+        Unpooled.wrappedBuffer(FORGE_LEGACY_HANDSHAKE_RESET_DATA.clone())
-    return msg;
+    );
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/network/BackendChannelInitializerHolder.java

@@ -2,34 +2,10 @@ package com.velocitypowered.proxy.network;
 
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelInitializer;
-import java.util.function.Supplier;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 
-public class BackendChannelInitializerHolder implements Supplier<ChannelInitializer<Channel>> {
+final class BackendChannelInitializerHolder extends ChannelInitializerHolder<Channel> {
-
-  private static final Logger LOGGER = LogManager.getLogger(ConnectionManager.class);
-  private ChannelInitializer<Channel> initializer;
 
   BackendChannelInitializerHolder(final ChannelInitializer<Channel> initializer) {
-    this.initializer = initializer;
+    super("backend channel", initializer);
-  }
-
-  @Override
-  public ChannelInitializer<Channel> get() {
-    return this.initializer;
-  }
-
-  /**
-   * Sets the channel initializer.
-   *
-   * @param initializer the new initializer to use
-   * @deprecated Internal implementation detail
-   */
-  @Deprecated
-  public void set(final ChannelInitializer<Channel> initializer) {
-    LOGGER.warn("The backend channel initializer has been replaced by {}",
-        Thread.currentThread().getStackTrace()[2]);
-    this.initializer = initializer;
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/network/ChannelInitializerHolder.java

@@ -0,0 +1,37 @@
+package com.velocitypowered.proxy.network;
+
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelInitializer;
+import java.util.function.Supplier;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public abstract class ChannelInitializerHolder<C extends Channel>
+    implements Supplier<ChannelInitializer<C>> {
+  private static final Logger LOGGER = LogManager.getLogger(ChannelInitializerHolder.class);
+  private final String name;
+  private ChannelInitializer<C> initializer;
+
+  ChannelInitializerHolder(final String name, final ChannelInitializer<C> initializer) {
+    this.name = name;
+    this.initializer = initializer;
+  }
+
+  @Override
+  public ChannelInitializer<C> get() {
+    return this.initializer;
+  }
+
+  /**
+   * Sets the channel initializer.
+   *
+   * @param initializer the new initializer to use
+   * @deprecated Internal implementation detail
+   */
+  @Deprecated
+  public void set(final ChannelInitializer<C> initializer) {
+    LOGGER.warn("The {} initializer has been replaced by {}", this.name,
+        Thread.currentThread().getStackTrace()[2]);
+    this.initializer = initializer;
+  }
+}

proxy/src/main/java/com/velocitypowered/proxy/network/ConnectionManager.java

@@ -43,9 +43,9 @@ public final class ConnectionManager {
   // These are intentionally made public for plugins like ViaVersion, which inject their own
   // protocol logic into the proxy.
   @SuppressWarnings("WeakerAccess")
-  public final ServerChannelInitializerHolder serverChannelInitializer;
+  public final ChannelInitializerHolder<Channel> serverChannelInitializer;
   @SuppressWarnings("WeakerAccess")
-  public final BackendChannelInitializerHolder backendChannelInitializer;
+  public final ChannelInitializerHolder<Channel> backendChannelInitializer;
 
   private final SeparatePoolInetNameResolver resolver;
   private final AsyncHttpClient httpClient;
@@ -198,7 +198,7 @@ public final class ConnectionManager {
     return bossGroup;
   }
 
-  public ServerChannelInitializerHolder getServerChannelInitializer() {
+  public ChannelInitializerHolder<Channel> getServerChannelInitializer() {
     return this.serverChannelInitializer;
   }
 
@@ -206,7 +206,7 @@ public final class ConnectionManager {
     return httpClient;
   }
 
-  public BackendChannelInitializerHolder getBackendChannelInitializer() {
+  public ChannelInitializerHolder<Channel> getBackendChannelInitializer() {
     return this.backendChannelInitializer;
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/network/ServerChannelInitializerHolder.java

@@ -2,33 +2,10 @@ package com.velocitypowered.proxy.network;
 
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelInitializer;
-import java.util.function.Supplier;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 
-public class ServerChannelInitializerHolder implements Supplier<ChannelInitializer<Channel>> {
+final class ServerChannelInitializerHolder extends ChannelInitializerHolder<Channel> {
-
-  private static final Logger LOGGER = LogManager.getLogger(ConnectionManager.class);
-  private ChannelInitializer<Channel> initializer;
 
   ServerChannelInitializerHolder(final ChannelInitializer<Channel> initializer) {
-    this.initializer = initializer;
+    super("server channel", initializer);
-  }
-
-  @Override
-  public ChannelInitializer<Channel> get() {
-    return this.initializer;
-  }
-
-  /**
-   * Sets the channel initializer.
-   * @param initializer the new initializer to use
-   * @deprecated Internal implementation detail
-   */
-  @Deprecated
-  public void set(final ChannelInitializer<Channel> initializer) {
-    LOGGER.warn("The server channel initializer has been replaced by {}",
-        Thread.currentThread().getStackTrace()[2]);
-    this.initializer = initializer;
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/Packet.java

@@ -3,12 +3,13 @@ package com.velocitypowered.proxy.protocol;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
 import io.netty.buffer.ByteBuf;
+import java.util.function.Supplier;
 
 public interface Packet {
 
   @Deprecated
   default void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion protocolVersion) {
-    throw new IllegalStateException();
+    throw new UnsupportedOperationException();
   }
 
   void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion protocolVersion);
@@ -16,6 +17,21 @@ public interface Packet {
   boolean handle(MinecraftSessionHandler handler);
 
   interface Decoder<P extends Packet> {
-    P decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version);
+    P decode(final ByteBuf buf, final ProtocolDirection direction, final ProtocolVersion version);
+
+    static <P extends Packet> Decoder<P> unsupported() {
+      return (buf, direction, version) -> {
+        throw new UnsupportedOperationException();
+      };
+    }
+
+    @Deprecated
+    static <P extends Packet> Decoder<P> method(final Supplier<P> factory) {
+      return (buf, direction, version) -> {
+        final P packet = factory.get();
+        packet.decode(buf, direction, version);
+        return packet;
+      };
+    }
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java

@@ -59,57 +59,54 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public enum StateRegistry {
 
-  HANDSHAKE {
+  HANDSHAKE(true) {
     {
-      serverbound.register(HandshakePacket.class, HandshakePacket::new,
+      serverbound.register(HandshakePacket.class, HandshakePacket.DECODER,
           map(0x00, MINECRAFT_1_7_2, false));
     }
   },
-  STATUS {
+  STATUS(true) {
     {
-      serverbound.registerNew(StatusRequestPacket.class, StatusRequestPacket.DECODER,
+      serverbound.register(StatusRequestPacket.class, StatusRequestPacket.DECODER,
           map(0x00, MINECRAFT_1_7_2, false));
-      serverbound.registerNew(StatusPingPacket.class, StatusPingPacket.DECODER,
+      serverbound.register(StatusPingPacket.class, StatusPingPacket.DECODER,
           map(0x01, MINECRAFT_1_7_2, false));
 
-      clientbound.register(StatusResponsePacket.class, StatusResponsePacket::new,
+      clientbound.register(StatusResponsePacket.class, StatusResponsePacket.DECODER,
           map(0x00, MINECRAFT_1_7_2, false));
-      clientbound.registerNew(StatusPingPacket.class, StatusPingPacket.DECODER,
+      clientbound.register(StatusPingPacket.class, StatusPingPacket.DECODER,
           map(0x01, MINECRAFT_1_7_2, false));
     }
   },
-  PLAY {
+  PLAY(false) {
     {
-      serverbound.fallback = false;
+      serverbound.register(TabCompleteRequestPacket.class, TabCompleteRequestPacket.DECODER,
-      clientbound.fallback = false;
-
-      serverbound.register(TabCompleteRequestPacket.class, TabCompleteRequestPacket::new,
           map(0x14, MINECRAFT_1_7_2, false),
           map(0x01, MINECRAFT_1_9, false),
           map(0x02, MINECRAFT_1_12, false),
           map(0x01, MINECRAFT_1_12_1, false),
           map(0x05, MINECRAFT_1_13, false),
           map(0x06, MINECRAFT_1_14, false));
-      serverbound.registerNew(ServerboundChatPacket.class, ServerboundChatPacket.DECODER,
+      serverbound.register(ServerboundChatPacket.class, ServerboundChatPacket.DECODER,
           map(0x01, MINECRAFT_1_7_2, false),
           map(0x02, MINECRAFT_1_9, false),
           map(0x03, MINECRAFT_1_12, false),
           map(0x02, MINECRAFT_1_12_1, false),
           map(0x03, MINECRAFT_1_14, false));
-      serverbound.register(ClientSettingsPacket.class, ClientSettingsPacket::new,
+      serverbound.register(ClientSettingsPacket.class, ClientSettingsPacket.DECODER,
           map(0x15, MINECRAFT_1_7_2, false),
           map(0x04, MINECRAFT_1_9, false),
           map(0x05, MINECRAFT_1_12, false),
           map(0x04, MINECRAFT_1_12_1, false),
           map(0x05, MINECRAFT_1_14, false));
-      serverbound.register(PluginMessagePacket.class, PluginMessagePacket::new,
+      serverbound.register(PluginMessagePacket.class, PluginMessagePacket.DECODER,
           map(0x17, MINECRAFT_1_7_2, false),
           map(0x09, MINECRAFT_1_9, false),
           map(0x0A, MINECRAFT_1_12, false),
           map(0x09, MINECRAFT_1_12_1, false),
           map(0x0A, MINECRAFT_1_13, false),
           map(0x0B, MINECRAFT_1_14, false));
-      serverbound.registerNew(KeepAlivePacket.class, KeepAlivePacket.DECODER,
+      serverbound.register(KeepAlivePacket.class, KeepAlivePacket.DECODER,
           map(0x00, MINECRAFT_1_7_2, false),
           map(0x0B, MINECRAFT_1_9, false),
           map(0x0C, MINECRAFT_1_12, false),
@@ -117,7 +114,7 @@ public enum StateRegistry {
           map(0x0E, MINECRAFT_1_13, false),
           map(0x0F, MINECRAFT_1_14, false),
           map(0x10, MINECRAFT_1_16, false));
-      serverbound.register(ResourcePackResponsePacket.class, ResourcePackResponsePacket::new,
+      serverbound.register(ResourcePackResponsePacket.class, ResourcePackResponsePacket.DECODER,
           map(0x19, MINECRAFT_1_8, false),
           map(0x16, MINECRAFT_1_9, false),
           map(0x18, MINECRAFT_1_12, false),
@@ -126,29 +123,29 @@ public enum StateRegistry {
           map(0x20, MINECRAFT_1_16, false),
           map(0x21, MINECRAFT_1_16_2, false));
 
-      clientbound.register(BossBarPacket.class, BossBarPacket::new,
+      clientbound.register(BossBarPacket.class, BossBarPacket.DECODER,
           map(0x0C, MINECRAFT_1_9, false),
           map(0x0D, MINECRAFT_1_15, false),
           map(0x0C, MINECRAFT_1_16, false));
-      clientbound.register(ClientboundChatPacket.class, ClientboundChatPacket::new,
+      clientbound.register(ClientboundChatPacket.class, ClientboundChatPacket.DECODER,
           map(0x02, MINECRAFT_1_7_2, true),
           map(0x0F, MINECRAFT_1_9, true),
           map(0x0E, MINECRAFT_1_13, true),
           map(0x0F, MINECRAFT_1_15, true),
           map(0x0E, MINECRAFT_1_16, true));
-      clientbound.register(TabCompleteResponsePacket.class, TabCompleteResponsePacket::new,
+      clientbound.register(TabCompleteResponsePacket.class, TabCompleteResponsePacket.DECODER,
           map(0x3A, MINECRAFT_1_7_2, false),
           map(0x0E, MINECRAFT_1_9, false),
           map(0x10, MINECRAFT_1_13, false),
           map(0x11, MINECRAFT_1_15, false),
           map(0x10, MINECRAFT_1_16, false),
           map(0x0F, MINECRAFT_1_16_2, false));
-      clientbound.register(AvailableCommandsPacket.class, AvailableCommandsPacket::new,
+      clientbound.register(AvailableCommandsPacket.class, AvailableCommandsPacket.DECODER,
           map(0x11, MINECRAFT_1_13, false),
           map(0x12, MINECRAFT_1_15, false),
           map(0x11, MINECRAFT_1_16, false),
           map(0x10, MINECRAFT_1_16_2, false));
-      clientbound.register(PluginMessagePacket.class, PluginMessagePacket::new,
+      clientbound.register(PluginMessagePacket.class, PluginMessagePacket.DECODER,
           map(0x3F, MINECRAFT_1_7_2, false),
           map(0x18, MINECRAFT_1_9, false),
           map(0x19, MINECRAFT_1_13, false),
@@ -156,7 +153,7 @@ public enum StateRegistry {
           map(0x19, MINECRAFT_1_15, false),
           map(0x18, MINECRAFT_1_16, false),
           map(0x17, MINECRAFT_1_16_2, false));
-      clientbound.register(DisconnectPacket.class, DisconnectPacket::new,
+      clientbound.register(DisconnectPacket.class, DisconnectPacket.DECODER,
           map(0x40, MINECRAFT_1_7_2, false),
           map(0x1A, MINECRAFT_1_9, false),
           map(0x1B, MINECRAFT_1_13, false),
@@ -164,7 +161,7 @@ public enum StateRegistry {
           map(0x1B, MINECRAFT_1_15, false),
           map(0x1A, MINECRAFT_1_16, false),
           map(0x19, MINECRAFT_1_16_2, false));
-      clientbound.registerNew(KeepAlivePacket.class, KeepAlivePacket.DECODER,
+      clientbound.register(KeepAlivePacket.class, KeepAlivePacket.DECODER,
           map(0x00, MINECRAFT_1_7_2, false),
           map(0x1F, MINECRAFT_1_9, false),
           map(0x21, MINECRAFT_1_13, false),
@@ -172,7 +169,7 @@ public enum StateRegistry {
           map(0x21, MINECRAFT_1_15, false),
           map(0x20, MINECRAFT_1_16, false),
           map(0x1F, MINECRAFT_1_16_2, false));
-      clientbound.register(JoinGamePacket.class, JoinGamePacket::new,
+      clientbound.register(JoinGamePacket.class, JoinGamePacket.DECODER,
           map(0x01, MINECRAFT_1_7_2, false),
           map(0x23, MINECRAFT_1_9, false),
           map(0x25, MINECRAFT_1_13, false),
@@ -180,7 +177,7 @@ public enum StateRegistry {
           map(0x26, MINECRAFT_1_15, false),
           map(0x25, MINECRAFT_1_16, false),
           map(0x24, MINECRAFT_1_16_2, false));
-      clientbound.register(RespawnPacket.class, RespawnPacket::new,
+      clientbound.register(RespawnPacket.class, RespawnPacket.DECODER,
           map(0x07, MINECRAFT_1_7_2, true),
           map(0x33, MINECRAFT_1_9, true),
           map(0x34, MINECRAFT_1_12, true),
@@ -190,7 +187,7 @@ public enum StateRegistry {
           map(0x3B, MINECRAFT_1_15, true),
           map(0x3A, MINECRAFT_1_16, true),
           map(0x39, MINECRAFT_1_16_2, true));
-      clientbound.register(ResourcePackRequestPacket.class, ResourcePackRequestPacket::new,
+      clientbound.register(ResourcePackRequestPacket.class, ResourcePackRequestPacket.DECODER,
           map(0x48, MINECRAFT_1_8, true),
           map(0x32, MINECRAFT_1_9, true),
           map(0x33, MINECRAFT_1_12, true),
@@ -200,7 +197,7 @@ public enum StateRegistry {
           map(0x3A, MINECRAFT_1_15, true),
           map(0x39, MINECRAFT_1_16, true),
           map(0x38, MINECRAFT_1_16_2, true));
-      clientbound.register(HeaderAndFooterPacket.class, HeaderAndFooterPacket::new,
+      clientbound.register(HeaderAndFooterPacket.class, HeaderAndFooterPacket.DECODER,
           map(0x47, MINECRAFT_1_8, true),
           map(0x48, MINECRAFT_1_9, true),
           map(0x47, MINECRAFT_1_9_4, true),
@@ -210,7 +207,7 @@ public enum StateRegistry {
           map(0x53, MINECRAFT_1_14, true),
           map(0x54, MINECRAFT_1_15, true),
           map(0x53, MINECRAFT_1_16, true));
-      clientbound.registerNew(TitlePacket.class, TitlePacket.DECODER,
+      clientbound.register(TitlePacket.class, TitlePacket.DECODER,
           map(0x45, MINECRAFT_1_8, true),
           map(0x45, MINECRAFT_1_9, true),
           map(0x47, MINECRAFT_1_12, true),
@@ -219,7 +216,7 @@ public enum StateRegistry {
           map(0x4F, MINECRAFT_1_14, true),
           map(0x50, MINECRAFT_1_15, true),
           map(0x4F, MINECRAFT_1_16, true));
-      clientbound.register(PlayerListItemPacket.class, PlayerListItemPacket::new,
+      clientbound.register(PlayerListItemPacket.class, PlayerListItemPacket.DECODER,
           map(0x38, MINECRAFT_1_7_2, false),
           map(0x2D, MINECRAFT_1_9, false),
           map(0x2E, MINECRAFT_1_12_1, false),
@@ -230,31 +227,36 @@ public enum StateRegistry {
           map(0x32, MINECRAFT_1_16_2, false));
     }
   },
-  LOGIN {
+  LOGIN(true) {
     {
-      serverbound.register(ServerLoginPacket.class, ServerLoginPacket::new,
+      serverbound.register(ServerLoginPacket.class, ServerLoginPacket.DECODER,
           map(0x00, MINECRAFT_1_7_2, false));
-      serverbound.register(EncryptionResponsePacket.class, EncryptionResponsePacket::new,
+      serverbound.register(EncryptionResponsePacket.class, EncryptionResponsePacket.DECODER,
           map(0x01, MINECRAFT_1_7_2, false));
-      serverbound.register(LoginPluginResponsePacket.class, LoginPluginResponsePacket::new,
+      serverbound.register(LoginPluginResponsePacket.class, LoginPluginResponsePacket.DECODER,
           map(0x02, MINECRAFT_1_13, false));
-      clientbound.register(DisconnectPacket.class, DisconnectPacket::new,
+      clientbound.register(DisconnectPacket.class, DisconnectPacket.DECODER,
           map(0x00, MINECRAFT_1_7_2, false));
-      clientbound.register(EncryptionRequestPacket.class, EncryptionRequestPacket::new,
+      clientbound.register(EncryptionRequestPacket.class, EncryptionRequestPacket.DECODER,
           map(0x01, MINECRAFT_1_7_2, false));
-      clientbound.register(ServerLoginSuccessPacket.class, ServerLoginSuccessPacket::new,
+      clientbound.register(ServerLoginSuccessPacket.class, ServerLoginSuccessPacket.DECODER,
           map(0x02, MINECRAFT_1_7_2, false));
-      clientbound.registerNew(SetCompressionPacket.class, SetCompressionPacket.DECODER,
+      clientbound.register(SetCompressionPacket.class, SetCompressionPacket.DECODER,
           map(0x03, MINECRAFT_1_8, false));
-      clientbound.register(LoginPluginMessagePacket.class, LoginPluginMessagePacket::new,
+      clientbound.register(LoginPluginMessagePacket.class, LoginPluginMessagePacket.DECODER,
           map(0x04, MINECRAFT_1_13, false));
     }
   };
 
   public static final int STATUS_ID = 1;
   public static final int LOGIN_ID = 2;
-  public final PacketRegistry clientbound = new PacketRegistry(ProtocolDirection.CLIENTBOUND);
+  public final PacketRegistry clientbound;
-  public final PacketRegistry serverbound = new PacketRegistry(ProtocolDirection.SERVERBOUND);
+  public final PacketRegistry serverbound;
+
+  StateRegistry(boolean fallback) {
+    this.clientbound = new PacketRegistry(ProtocolDirection.CLIENTBOUND, fallback);
+    this.serverbound = new PacketRegistry(ProtocolDirection.SERVERBOUND, fallback);
+  }
 
   public PacketRegistry.ProtocolRegistry getProtocolRegistry(ProtocolDirection direction,
       ProtocolVersion version) {
@@ -266,10 +268,15 @@ public enum StateRegistry {
 
     private final ProtocolDirection direction;
     private final Map<ProtocolVersion, ProtocolRegistry> versions;
-    private boolean fallback = true;
+    private final boolean fallback;
 
     PacketRegistry(ProtocolDirection direction) {
+      this(direction, true);
+    }
+
+    PacketRegistry(ProtocolDirection direction, boolean fallback) {
       this.direction = direction;
+      this.fallback = fallback;
 
       Map<ProtocolVersion, ProtocolRegistry> mutableVersions = new EnumMap<>(ProtocolVersion.class);
       for (ProtocolVersion version : ProtocolVersion.values()) {
@@ -292,7 +299,7 @@ public enum StateRegistry {
       return registry;
     }
 
-    <P extends Packet> void registerNew(Class<P> clazz, Packet.Decoder<P> decoder,
+    <P extends Packet> void register(Class<P> clazz, Packet.Decoder<P> decoder,
                                      PacketMapping... mappings) {
       if (mappings.length == 0) {
         throw new IllegalArgumentException("At least one mapping must be provided.");
@@ -338,53 +345,6 @@ public enum StateRegistry {
       }
     }
 
-    @Deprecated
-    <P extends Packet> void register(Class<P> clazz, Supplier<P> packetSupplier,
-                                     PacketMapping... mappings) {
-      if (mappings.length == 0) {
-        throw new IllegalArgumentException("At least one mapping must be provided.");
-      }
-
-      for (int i = 0; i < mappings.length; i++) {
-        PacketMapping current = mappings[i];
-        PacketMapping next = (i + 1 < mappings.length) ? mappings[i + 1] : current;
-        ProtocolVersion from = current.protocolVersion;
-        ProtocolVersion to = current == next ? getLast(SUPPORTED_VERSIONS) : next.protocolVersion;
-
-        if (from.gte(to) && from != getLast(SUPPORTED_VERSIONS)) {
-          throw new IllegalArgumentException(String.format(
-              "Next mapping version (%s) should be lower then current (%s)", to, from));
-        }
-
-        for (ProtocolVersion protocol : EnumSet.range(from, to)) {
-          if (protocol == to && next != current) {
-            break;
-          }
-          ProtocolRegistry registry = this.versions.get(protocol);
-          if (registry == null) {
-            throw new IllegalArgumentException("Unknown protocol version "
-                + current.protocolVersion);
-          }
-
-          if (registry.packetIdToSupplier.containsKey(current.id)) {
-            throw new IllegalArgumentException("Can not register class " + clazz.getSimpleName()
-                + " with id " + current.id + " for " + registry.version
-                + " because another packet is already registered");
-          }
-
-          if (registry.packetClassToId.containsKey(clazz)) {
-            throw new IllegalArgumentException(clazz.getSimpleName()
-                + " is already registered for version " + registry.version);
-          }
-
-          if (!current.encodeOnly) {
-            registry.packetIdToSupplier.put(current.id, packetSupplier);
-          }
-          registry.packetClassToId.put(clazz, current.id);
-        }
-      }
-    }
-
     public class ProtocolRegistry {
 
       public final ProtocolVersion version;
@@ -408,7 +368,7 @@ public enum StateRegistry {
        * @return the packet instance, or {@code null} if the ID is not registered
        */
       @Deprecated
-      public @Nullable Packet createPacket(final int id) {
+      @Nullable Packet createPacket(final int id) {
         final Supplier<? extends Packet> supplier = this.packetIdToSupplier.get(id);
         if (supplier == null) {
           return null;
@@ -416,13 +376,22 @@ public enum StateRegistry {
         return supplier.get();
       }
 
+      /**
+       * Attempts to create a packet from the specified {@code id}.
+       *
+       * @param id the packet ID
+       * @param buf the bytebuf
+       * @param direction the packet direction
+       * @param version the protocol version
+       * @return the packet instance, or {@code null} if the ID is not registered
+       */
       public @Nullable Packet decodePacket(final int id, ByteBuf buf, ProtocolDirection direction,
-                                           ProtocolVersion protocolVersion) {
+                                           ProtocolVersion version) {
         final Packet.Decoder<? extends Packet> decoder = this.packetIdToDecoder.get(id);
         if (decoder == null) {
           return null;
         }
-        return decoder.decode(buf, direction, protocolVersion);
+        return decoder.decode(buf, direction, version);
       }
 
       /**

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftDecoder.java

@@ -53,27 +53,17 @@ public class MinecraftDecoder extends ChannelInboundHandlerAdapter {
 
     int originalReaderIndex = buf.readerIndex();
     int packetId = ProtocolUtils.readVarInt(buf);
-    final boolean decoded;
+    Packet packet = null;
-    Packet packet = this.registry.decodePacket(packetId, buf, direction, registry.version);
+    try {
-    if (packet == null) {
+      packet = this.registry.decodePacket(packetId, buf, direction, registry.version);
-      packet = this.registry.createPacket(packetId);
+    } catch (Exception e) {
-      decoded = false;
+      throw handleDecodeFailure(e, packet, packetId); // TODO: packet is always null
-    } else {
-      decoded = true;
     }
     if (packet == null) {
       buf.readerIndex(originalReaderIndex);
       ctx.fireChannelRead(buf);
     } else {
       try {
-        if (!decoded) {
-          try {
-            packet.decode(buf, direction, registry.version);
-          } catch (Exception e) {
-            throw handleDecodeFailure(e, packet, packetId);
-          }
-        }
-
         if (buf.isReadable()) {
           throw handleNotReadEnough(packet, packetId);
         }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/AvailableCommandsPacket.java

@@ -36,6 +36,8 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class AvailableCommandsPacket implements Packet {
+  public static final Decoder<AvailableCommandsPacket> DECODER = Decoder.method(AvailableCommandsPacket::new);
+
   private static final Command<CommandSource> PLACEHOLDER_COMMAND = source -> 0;
 
   private static final byte NODE_TYPE_ROOT = 0x00;

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/BossBarPacket.java

@@ -11,6 +11,8 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class BossBarPacket implements Packet {
 
+  public static final Decoder<BossBarPacket> DECODER = Decoder.method(BossBarPacket::new);
+
   public static final int ADD = 0;
   public static final int REMOVE = 1;
   public static final int UPDATE_PERCENT = 2;
@@ -87,7 +89,7 @@ public class BossBarPacket implements Packet {
 
   @Override
   public String toString() {
-    return "BossBar{"
+    return "BossBarPacket{"
         + "uuid=" + uuid
         + ", action=" + action
         + ", name='" + name + '\''

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ClientSettingsPacket.java

@@ -10,6 +10,8 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class ClientSettingsPacket implements Packet {
 
+  public static final Decoder<ClientSettingsPacket> DECODER = Decoder.method(ClientSettingsPacket::new);
+
   private @Nullable String locale;
   private byte viewDistance;
   private int chatVisibility;
@@ -84,7 +86,7 @@ public class ClientSettingsPacket implements Packet {
 
   @Override
   public String toString() {
-    return "ClientSettings{"
+    return "ClientSettingsPacket{"
         + "locale='" + locale + '\''
         + ", viewDistance=" + viewDistance
         + ", chatVisibility=" + chatVisibility

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ClientboundChatPacket.java

@@ -12,6 +12,8 @@ import java.util.UUID;
 
 public class ClientboundChatPacket implements Packet {
 
+  public static final Decoder<ClientboundChatPacket> DECODER = Decoder.method(ClientboundChatPacket::new);
+
   public static final byte CHAT_TYPE = (byte) 0;
   public static final byte SYSTEM_TYPE = (byte) 1;
   public static final byte GAME_INFO_TYPE = (byte) 2;
@@ -20,7 +22,7 @@ public class ClientboundChatPacket implements Packet {
   private byte type;
   private @Nullable UUID sender;
 
-  public ClientboundChatPacket() {
+  private ClientboundChatPacket() {
   }
 
   public ClientboundChatPacket(String message, byte type, UUID sender) {
@@ -29,30 +31,6 @@ public class ClientboundChatPacket implements Packet {
     this.sender = sender;
   }
 
-  public String getMessage() {
-    if (message == null) {
-      throw new IllegalStateException("Message is not specified");
-    }
-    return message;
-  }
-
-  public byte getType() {
-    return type;
-  }
-
-  public UUID getSenderUuid() {
-    return sender;
-  }
-
-  @Override
-  public String toString() {
-    return "ClientboundChatPacket{"
-        + "message='" + message + '\''
-        + ", type=" + type
-        + ", sender=" + sender
-        + '}';
-  }
-
   @Override
   public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
     message = ProtocolUtils.readString(buf);
@@ -82,4 +60,28 @@ public class ClientboundChatPacket implements Packet {
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
+
+  public String getMessage() {
+    if (message == null) {
+      throw new IllegalStateException("Message is not specified");
+    }
+    return message;
+  }
+
+  public byte getType() {
+    return type;
+  }
+
+  public UUID getSenderUuid() {
+    return sender;
+  }
+
+  @Override
+  public String toString() {
+    return "ClientboundChatPacket{"
+      + "message='" + message + '\''
+      + ", type=" + type
+      + ", sender=" + sender
+      + '}';
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/DisconnectPacket.java

@@ -11,6 +11,7 @@ import net.kyori.adventure.text.Component;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class DisconnectPacket implements Packet {
+  public static final Decoder<DisconnectPacket> DECODER = Decoder.method(DisconnectPacket::new);
 
   private @Nullable String reason;
 
@@ -34,7 +35,7 @@ public class DisconnectPacket implements Packet {
 
   @Override
   public String toString() {
-    return "Disconnect{"
+    return "DisconnectPacket{"
         + "reason='" + reason + '\''
         + '}';
   }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/EncryptionRequestPacket.java

@@ -11,6 +11,7 @@ import io.netty.buffer.ByteBuf;
 import java.util.Arrays;
 
 public class EncryptionRequestPacket implements Packet {
+  public static final Decoder<EncryptionRequestPacket> DECODER = Decoder.method(EncryptionRequestPacket::new);
 
   private String serverId = "";
   private byte[] publicKey = EMPTY_BYTE_ARRAY;
@@ -34,7 +35,7 @@ public class EncryptionRequestPacket implements Packet {
 
   @Override
   public String toString() {
-    return "EncryptionRequest{"
+    return "EncryptionRequestPacket{"
         + "publicKey=" + Arrays.toString(publicKey)
         + ", verifyToken=" + Arrays.toString(verifyToken)
         + '}';

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/EncryptionResponsePacket.java

@@ -11,6 +11,7 @@ import io.netty.buffer.ByteBuf;
 import java.util.Arrays;
 
 public class EncryptionResponsePacket implements Packet {
+  public static final Decoder<EncryptionResponsePacket> DECODER = Decoder.method(EncryptionResponsePacket::new);
 
   private byte[] sharedSecret = EMPTY_BYTE_ARRAY;
   private byte[] verifyToken = EMPTY_BYTE_ARRAY;
@@ -25,7 +26,7 @@ public class EncryptionResponsePacket implements Packet {
 
   @Override
   public String toString() {
-    return "EncryptionResponse{"
+    return "EncryptionResponsePacket{"
         + "sharedSecret=" + Arrays.toString(sharedSecret)
         + ", verifyToken=" + Arrays.toString(verifyToken)
         + '}';

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/HandshakePacket.java

@@ -9,6 +9,8 @@ import io.netty.buffer.ByteBuf;
 
 public class HandshakePacket implements Packet {
 
+  public static final Decoder<HandshakePacket> DECODER = Decoder.method(HandshakePacket::new);
+
   private ProtocolVersion protocolVersion;
   private String serverAddress = "";
   private int port;
@@ -48,7 +50,7 @@ public class HandshakePacket implements Packet {
 
   @Override
   public String toString() {
-    return "Handshake{"
+    return "HandshakePacket{"
         + "protocolVersion=" + protocolVersion
         + ", serverAddress='" + serverAddress + '\''
         + ", port=" + port

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/HeaderAndFooterPacket.java

@@ -7,11 +7,10 @@ import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
 import com.velocitypowered.proxy.protocol.Packet;
 import com.velocitypowered.proxy.protocol.ProtocolDirection;
-import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import io.netty.buffer.ByteBuf;
-import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
 
 public class HeaderAndFooterPacket implements Packet {
+  public static final Decoder<HeaderAndFooterPacket> DECODER = Decoder.method(HeaderAndFooterPacket::new);
 
   private static final String EMPTY_COMPONENT = "{\"translate\":\"\"}";
   private static final HeaderAndFooterPacket RESET = new HeaderAndFooterPacket();
@@ -28,19 +27,6 @@ public class HeaderAndFooterPacket implements Packet {
     this.footer = Preconditions.checkNotNull(footer, "footer");
   }
 
-  public String getHeader() {
-    return header;
-  }
-
-  public String getFooter() {
-    return footer;
-  }
-
-  @Override
-  public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    throw new UnsupportedOperationException("Decode is not implemented");
-  }
-
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
     writeString(buf, header);
@@ -52,10 +38,12 @@ public class HeaderAndFooterPacket implements Packet {
     return handler.handle(this);
   }
 
-  public static HeaderAndFooterPacket create(net.kyori.adventure.text.Component header,
+  public String getHeader() {
-                                             net.kyori.adventure.text.Component footer, ProtocolVersion protocolVersion) {
+    return header;
-    GsonComponentSerializer serializer = ProtocolUtils.getJsonChatSerializer(protocolVersion);
+  }
-    return new HeaderAndFooterPacket(serializer.serialize(header), serializer.serialize(footer));
+
+  public String getFooter() {
+    return footer;
   }
 
   public static HeaderAndFooterPacket reset() {

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/JoinGamePacket.java

@@ -16,6 +16,7 @@ import net.kyori.adventure.nbt.ListBinaryTag;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class JoinGamePacket implements Packet {
+  public static final Decoder<JoinGamePacket> DECODER = Decoder.method(JoinGamePacket::new);
 
   private int entityId;
   private short gamemode;
@@ -148,7 +149,7 @@ public class JoinGamePacket implements Packet {
 
   @Override
   public String toString() {
-    return "JoinGame{"
+    return "JoinGamePacket{"
         + "entityId=" + entityId
         + ", gamemode=" + gamemode
         + ", dimension=" + dimension

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/KeepAlivePacket.java

@@ -11,7 +11,7 @@ public class KeepAlivePacket implements Packet {
 
   public static final Decoder<KeepAlivePacket> DECODER = (buf, direction, version) -> {
     final long randomId;
-    if (version.compareTo(ProtocolVersion.MINECRAFT_1_12_2) >= 0) {
+    if (version.gte(ProtocolVersion.MINECRAFT_1_12_2)) {
       randomId = buf.readLong();
     } else if (version.gte(ProtocolVersion.MINECRAFT_1_8)) {
       randomId = ProtocolUtils.readVarInt(buf);
@@ -38,18 +38,18 @@ public class KeepAlivePacket implements Packet {
     }
   }
 
-  public long getRandomId() {
-    return randomId;
-  }
-
   @Override
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
 
+  public long getRandomId() {
+    return randomId;
+  }
+
   @Override
   public String toString() {
-    return "KeepAlive{"
+    return "KeepAlivePacket{"
       + "randomId=" + randomId
       + '}';
   }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/LoginPluginMessagePacket.java

@@ -5,19 +5,28 @@ import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
 import com.velocitypowered.proxy.protocol.Packet;
 import com.velocitypowered.proxy.protocol.ProtocolDirection;
 import com.velocitypowered.proxy.protocol.ProtocolUtils;
-import com.velocitypowered.proxy.protocol.util.DeferredByteBufHolder;
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.DefaultByteBufHolder;
 import io.netty.buffer.Unpooled;
+import java.util.Objects;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public class LoginPluginMessagePacket extends DeferredByteBufHolder implements Packet {
+public class LoginPluginMessagePacket extends DefaultByteBufHolder implements Packet {
 
-  private int id;
+  public static final Decoder<LoginPluginMessagePacket> DECODER = (buf, direction, version) -> {
-  private @Nullable String channel;
+    final int id = ProtocolUtils.readVarInt(buf);
+    final String channel = ProtocolUtils.readString(buf);
+    final ByteBuf data;
+    if (buf.isReadable()) {
+      data = buf.readSlice(buf.readableBytes());
+    } else {
+      data = Unpooled.EMPTY_BUFFER;
+    }
+    return new LoginPluginMessagePacket(id, channel, data);
+  };
 
-  public LoginPluginMessagePacket() {
+  private final int id;
-    super(null);
+  private final @Nullable String channel;
-  }
 
   public LoginPluginMessagePacket(int id, @Nullable String channel, ByteBuf data) {
     super(data);
@@ -25,37 +34,6 @@ public class LoginPluginMessagePacket extends DeferredByteBufHolder implements P
     this.channel = channel;
   }
 
-  public int getId() {
-    return id;
-  }
-
-  public String getChannel() {
-    if (channel == null) {
-      throw new IllegalStateException("Channel is not specified!");
-    }
-    return channel;
-  }
-
-  @Override
-  public String toString() {
-    return "LoginPluginMessage{"
-        + "id=" + id
-        + ", channel='" + channel + '\''
-        + ", data=" + super.toString()
-        + '}';
-  }
-
-  @Override
-  public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    this.id = ProtocolUtils.readVarInt(buf);
-    this.channel = ProtocolUtils.readString(buf);
-    if (buf.isReadable()) {
-      this.replace(buf.readSlice(buf.readableBytes()));
-    } else {
-      this.replace(Unpooled.EMPTY_BUFFER);
-    }
-  }
-
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
     ProtocolUtils.writeVarInt(buf, id);
@@ -70,4 +48,39 @@ public class LoginPluginMessagePacket extends DeferredByteBufHolder implements P
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
+
+  public int getId() {
+    return id;
+  }
+
+  public String getChannel() {
+    if (channel == null) {
+      throw new IllegalStateException("Channel is not specified!");
+    }
+    return channel;
+  }
+
+  @Override
+  public String toString() {
+    return "LoginPluginMessagePacket{"
+      + "id=" + id
+      + ", channel='" + channel + '\''
+      + ", data=" + super.toString()
+      + '}';
+  }
+
+  @Override
+  public boolean equals(final Object other) {
+    if(this == other) return true;
+    if(other == null || this.getClass() != other.getClass()) return false;
+    final LoginPluginMessagePacket that = (LoginPluginMessagePacket) other;
+    return this.id == that.id
+        && Objects.equals(this.channel, that.channel)
+        && super.equals(other);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(this.id, this.channel, super.hashCode());
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/LoginPluginResponsePacket.java

@@ -5,19 +5,28 @@ import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
 import com.velocitypowered.proxy.protocol.Packet;
 import com.velocitypowered.proxy.protocol.ProtocolDirection;
 import com.velocitypowered.proxy.protocol.ProtocolUtils;
-import com.velocitypowered.proxy.protocol.util.DeferredByteBufHolder;
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.DefaultByteBufHolder;
 import io.netty.buffer.Unpooled;
+import java.util.Objects;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
-public class LoginPluginResponsePacket extends DeferredByteBufHolder implements Packet {
+public class LoginPluginResponsePacket extends DefaultByteBufHolder implements Packet {
 
-  private int id;
+  public static final Decoder<LoginPluginResponsePacket> DECODER = (buf, direction, version) -> {
-  private boolean success;
+    final int id = ProtocolUtils.readVarInt(buf);
+    final boolean success = buf.readBoolean();
+    final ByteBuf data;
+    if (buf.isReadable()) {
+      data = buf.readSlice(buf.readableBytes());
+    } else {
+      data = Unpooled.EMPTY_BUFFER;
+    }
+    return new LoginPluginResponsePacket(id, success, data);
+  };
 
-  public LoginPluginResponsePacket() {
+  private final int id;
-    super(Unpooled.EMPTY_BUFFER);
+  private final boolean success;
-  }
 
   public LoginPluginResponsePacket(int id, boolean success, @MonotonicNonNull ByteBuf buf) {
     super(buf);
@@ -25,42 +34,6 @@ public class LoginPluginResponsePacket extends DeferredByteBufHolder implements
     this.success = success;
   }
 
-  public int getId() {
-    return id;
-  }
-
-  public void setId(int id) {
-    this.id = id;
-  }
-
-  public boolean isSuccess() {
-    return success;
-  }
-
-  public void setSuccess(boolean success) {
-    this.success = success;
-  }
-
-  @Override
-  public String toString() {
-    return "LoginPluginResponse{"
-        + "id=" + id
-        + ", success=" + success
-        + ", data=" + super.toString()
-        + '}';
-  }
-
-  @Override
-  public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    this.id = ProtocolUtils.readVarInt(buf);
-    this.success = buf.readBoolean();
-    if (buf.isReadable()) {
-      this.replace(buf.readSlice(buf.readableBytes()));
-    } else {
-      this.replace(Unpooled.EMPTY_BUFFER);
-    }
-  }
-
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
     ProtocolUtils.writeVarInt(buf, id);
@@ -72,4 +45,36 @@ public class LoginPluginResponsePacket extends DeferredByteBufHolder implements
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
+
+  public int getId() {
+    return id;
+  }
+
+  public boolean isSuccess() {
+    return success;
+  }
+
+  @Override
+  public String toString() {
+    return "LoginPluginResponsePacket{"
+        + "id=" + id
+        + ", success=" + success
+        + ", data=" + super.toString()
+        + '}';
+  }
+
+  @Override
+  public boolean equals(final Object other) {
+    if(this == other) return true;
+    if(other == null || this.getClass() != other.getClass()) return false;
+    final LoginPluginResponsePacket that = (LoginPluginResponsePacket) other;
+    return this.id == that.id
+      && Objects.equals(this.success, that.success)
+      && super.equals(other);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(this.id, this.success, super.hashCode());
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/PlayerListItemPacket.java

@@ -17,6 +17,7 @@ import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class PlayerListItemPacket implements Packet {
+  public static final Decoder<PlayerListItemPacket> DECODER = Decoder.method(PlayerListItemPacket::new);
 
   public static final int ADD_PLAYER = 0;
   public static final int UPDATE_GAMEMODE = 1;

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/PluginMessagePacket.java

@@ -7,18 +7,29 @@ import com.velocitypowered.proxy.connection.MinecraftSessionHandler;
 import com.velocitypowered.proxy.protocol.Packet;
 import com.velocitypowered.proxy.protocol.ProtocolDirection;
 import com.velocitypowered.proxy.protocol.ProtocolUtils;
-import com.velocitypowered.proxy.protocol.util.DeferredByteBufHolder;
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.DefaultByteBufHolder;
+import java.util.Objects;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public class PluginMessagePacket extends DeferredByteBufHolder implements Packet {
+public class PluginMessagePacket extends DefaultByteBufHolder implements Packet {
 
-  private @Nullable String channel;
+  public static final Decoder<PluginMessagePacket> DECODER = (buf, direction, version) -> {
+    String channel = ProtocolUtils.readString(buf);
+    if (version.gte(ProtocolVersion.MINECRAFT_1_13)) {
+      channel = transformLegacyToModernChannel(channel);
+    }
+    final ByteBuf data;
+    if (version.gte(ProtocolVersion.MINECRAFT_1_8)) {
+      data = buf.readRetainedSlice(buf.readableBytes());
+    } else {
+      data = ProtocolUtils.readRetainedByteBufSlice17(buf);
+    }
+    return new PluginMessagePacket(channel, data);
+  };
 
-  public PluginMessagePacket() {
+  private final @Nullable String channel;
-    super(null);
-  }
 
   public PluginMessagePacket(String channel,
                              @MonotonicNonNull ByteBuf backing) {
@@ -26,39 +37,6 @@ public class PluginMessagePacket extends DeferredByteBufHolder implements Packet
     this.channel = channel;
   }
 
-  public String getChannel() {
-    if (channel == null) {
-      throw new IllegalStateException("Channel is not specified.");
-    }
-    return channel;
-  }
-
-  public void setChannel(String channel) {
-    this.channel = channel;
-  }
-
-  @Override
-  public String toString() {
-    return "PluginMessage{"
-        + "channel='" + channel + '\''
-        + ", data=" + super.toString()
-        + '}';
-  }
-
-  @Override
-  public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    this.channel = ProtocolUtils.readString(buf);
-    if (version.gte(ProtocolVersion.MINECRAFT_1_13)) {
-      this.channel = transformLegacyToModernChannel(this.channel);
-    }
-    if (version.gte(ProtocolVersion.MINECRAFT_1_8)) {
-      this.replace(buf.readRetainedSlice(buf.readableBytes()));
-    } else {
-      this.replace(ProtocolUtils.readRetainedByteBufSlice17(buf));
-    }
-
-  }
-
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
     if (channel == null) {
@@ -74,7 +52,6 @@ public class PluginMessagePacket extends DeferredByteBufHolder implements Packet
     } else {
       ProtocolUtils.writeByteBuf17(content(), buf, true); // True for Forge support
     }
-
   }
 
   @Override
@@ -82,24 +59,16 @@ public class PluginMessagePacket extends DeferredByteBufHolder implements Packet
     return handler.handle(this);
   }
 
-  @Override
+  public String getChannel() {
-  public PluginMessagePacket copy() {
+    if (channel == null) {
-    return (PluginMessagePacket) super.copy();
+      throw new IllegalStateException("Channel is not specified.");
-  }
+    }
-
+    return channel;
-  @Override
-  public PluginMessagePacket duplicate() {
-    return (PluginMessagePacket) super.duplicate();
-  }
-
-  @Override
-  public PluginMessagePacket retainedDuplicate() {
-    return (PluginMessagePacket) super.retainedDuplicate();
   }
 
   @Override
   public PluginMessagePacket replace(ByteBuf content) {
-    return (PluginMessagePacket) super.replace(content);
+    return new PluginMessagePacket(this.channel, content);
   }
 
   @Override
@@ -121,4 +90,26 @@ public class PluginMessagePacket extends DeferredByteBufHolder implements Packet
   public PluginMessagePacket touch(Object hint) {
     return (PluginMessagePacket) super.touch(hint);
   }
+
+  @Override
+  public String toString() {
+    return "PluginMessagePacket{"
+      + "channel='" + channel + '\''
+      + ", data=" + super.toString()
+      + '}';
+  }
+
+  @Override
+  public boolean equals(final Object other) {
+    if(this == other) return true;
+    if(other == null || this.getClass() != other.getClass()) return false;
+    final PluginMessagePacket that = (PluginMessagePacket) other;
+    return Objects.equals(this.channel, that.channel)
+      && super.equals(other);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(this.channel, super.hashCode());
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ResourcePackRequestPacket.java

@@ -10,6 +10,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class ResourcePackRequestPacket implements Packet {
+  public static final Decoder<ResourcePackRequestPacket> DECODER = Decoder.method(ResourcePackRequestPacket::new);
 
   private @MonotonicNonNull String url;
   private @MonotonicNonNull String hash;
@@ -52,7 +53,7 @@ public class ResourcePackRequestPacket implements Packet {
 
   @Override
   public String toString() {
-    return "ResourcePackRequest{"
+    return "ResourcePackRequestPacket{"
         + "url='" + url + '\''
         + ", hash='" + hash + '\''
         + '}';

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ResourcePackResponsePacket.java

@@ -11,6 +11,8 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 public class ResourcePackResponsePacket implements Packet {
 
+  public static final Decoder<ResourcePackResponsePacket> DECODER = Decoder.method(ResourcePackResponsePacket::new);
+
   private String hash = "";
   private @MonotonicNonNull Status status;
 
@@ -44,7 +46,7 @@ public class ResourcePackResponsePacket implements Packet {
 
   @Override
   public String toString() {
-    return "ResourcePackResponse{"
+    return "ResourcePackResponsePacket{"
         + "hash=" + hash + ", "
         + "status=" + status
         + '}';

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/RespawnPacket.java

@@ -11,6 +11,7 @@ import io.netty.buffer.ByteBuf;
 import net.kyori.adventure.nbt.CompoundBinaryTag;
 
 public class RespawnPacket implements Packet {
+  public static final Decoder<RespawnPacket> DECODER = Decoder.method(RespawnPacket::new);
 
   private int dimension;
   private long partialHashedSeed;
@@ -97,7 +98,7 @@ public class RespawnPacket implements Packet {
 
   @Override
   public String toString() {
-    return "Respawn{"
+    return "RespawnPacket{"
         + "dimension=" + dimension
         + ", partialHashedSeed=" + partialHashedSeed
         + ", difficulty=" + difficulty

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ServerLoginPacket.java

@@ -11,6 +11,7 @@ import io.netty.buffer.ByteBuf;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class ServerLoginPacket implements Packet {
+  public static final Decoder<ServerLoginPacket> DECODER = Decoder.method(ServerLoginPacket::new);
 
   private static final QuietDecoderException EMPTY_USERNAME = new QuietDecoderException("Empty username!");
 
@@ -32,7 +33,7 @@ public class ServerLoginPacket implements Packet {
 
   @Override
   public String toString() {
-    return "ServerLogin{"
+    return "ServerLoginPacket{"
         + "username='" + username + '\''
         + '}';
   }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ServerLoginSuccessPacket.java

@@ -11,6 +11,7 @@ import java.util.UUID;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class ServerLoginSuccessPacket implements Packet {
+  public static final Decoder<ServerLoginSuccessPacket> DECODER = Decoder.method(ServerLoginSuccessPacket::new);
 
   private @Nullable UUID uuid;
   private @Nullable String username;
@@ -39,7 +40,7 @@ public class ServerLoginSuccessPacket implements Packet {
 
   @Override
   public String toString() {
-    return "ServerLoginSuccess{"
+    return "ServerLoginSuccessPacket{"
         + "uuid=" + uuid
         + ", username='" + username + '\''
         + '}';

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/ServerboundChatPacket.java

@@ -6,7 +6,6 @@ import com.velocitypowered.proxy.protocol.Packet;
 import com.velocitypowered.proxy.protocol.ProtocolDirection;
 import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import io.netty.buffer.ByteBuf;
-import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class ServerboundChatPacket implements Packet {
 
@@ -17,7 +16,7 @@ public class ServerboundChatPacket implements Packet {
 
   public static final int MAX_MESSAGE_LENGTH = 256;
 
-  private final @Nullable String message;
+  private final String message;
 
   public ServerboundChatPacket(String message) {
     this.message = message;
@@ -25,27 +24,21 @@ public class ServerboundChatPacket implements Packet {
 
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    if (message == null) {
-      throw new IllegalStateException("Message is not specified");
-    }
     ProtocolUtils.writeString(buf, message);
   }
 
-  public String getMessage() {
-    if (message == null) {
-      throw new IllegalStateException("Message is not specified");
-    }
-    return message;
-  }
-
   @Override
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
 
+  public String getMessage() {
+    return message;
+  }
+
   @Override
   public String toString() {
-    return "Chat{"
+    return "ServerboundChatPacket{"
       + "message='" + message + '\''
       + '}';
   }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/SetCompressionPacket.java

@@ -36,7 +36,7 @@ public class SetCompressionPacket implements Packet {
 
   @Override
   public String toString() {
-    return "SetCompression{"
+    return "SetCompressionPacket{"
       + "threshold=" + threshold
       + '}';
   }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/StatusPingPacket.java

@@ -8,7 +8,7 @@ import io.netty.buffer.ByteBuf;
 
 public class StatusPingPacket implements Packet {
 
-  public static Decoder<StatusPingPacket> DECODER = (buf, direction, version) -> {
+  public static final Decoder<StatusPingPacket> DECODER = (buf, direction, version) -> {
     final long randomId = buf.readLong();
     return new StatusPingPacket(randomId);
   };

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/StatusRequestPacket.java

@@ -9,7 +9,7 @@ import io.netty.buffer.ByteBuf;
 public class StatusRequestPacket implements Packet {
 
   public static final StatusRequestPacket INSTANCE = new StatusRequestPacket();
-  public static Decoder<StatusRequestPacket> DECODER = (buf, direction, version) -> INSTANCE;
+  public static final Decoder<StatusRequestPacket> DECODER = (buf, direction, version) -> INSTANCE;
 
   private StatusRequestPacket() {
   }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/StatusResponsePacket.java

@@ -10,34 +10,17 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class StatusResponsePacket implements Packet {
 
-  private @Nullable CharSequence status;
+  public static final Decoder<StatusResponsePacket> DECODER = (buf, direction, version) -> {
+    final String status = ProtocolUtils.readString(buf, Short.MAX_VALUE);
+    return new StatusResponsePacket(status);
+  };
 
-  public StatusResponsePacket() {
+  private final @Nullable CharSequence status;
-  }
 
   public StatusResponsePacket(CharSequence status) {
     this.status = status;
   }
 
-  public String getStatus() {
-    if (status == null) {
-      throw new IllegalStateException("Status is not specified");
-    }
-    return status.toString();
-  }
-
-  @Override
-  public String toString() {
-    return "StatusResponse{"
-        + "status='" + status + '\''
-        + '}';
-  }
-
-  @Override
-  public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    status = ProtocolUtils.readString(buf, Short.MAX_VALUE);
-  }
-
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
     if (status == null) {
@@ -50,4 +33,18 @@ public class StatusResponsePacket implements Packet {
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
+
+  public String getStatus() {
+    if (status == null) {
+      throw new IllegalStateException("Status is not specified");
+    }
+    return status.toString();
+  }
+
+  @Override
+  public String toString() {
+    return "StatusResponsePacket{"
+      + "status='" + status + '\''
+      + '}';
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TabCompleteRequestPacket.java

@@ -15,6 +15,8 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class TabCompleteRequestPacket implements Packet {
 
+  public static final Decoder<TabCompleteRequestPacket> DECODER = Decoder.method(TabCompleteRequestPacket::new);
+
   private static final int VANILLA_MAX_TAB_COMPLETE_LEN = 2048;
 
   private @Nullable String command;

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TabCompleteResponsePacket.java

@@ -16,6 +16,8 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class TabCompleteResponsePacket implements Packet {
 
+  public static final Decoder<TabCompleteResponsePacket> DECODER = Decoder.method(TabCompleteResponsePacket::new);
+
   private int transactionId;
   private int start;
   private int length;
@@ -51,7 +53,7 @@ public class TabCompleteResponsePacket implements Packet {
 
   @Override
   public String toString() {
-    return "TabCompleteResponse{"
+    return "TabCompleteResponsePacket{"
         + "transactionId=" + transactionId
         + ", start=" + start
         + ", length=" + length

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TitlePacket.java

@@ -14,9 +14,7 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class TitlePacket implements Packet {
 
-  public static final Decoder<TitlePacket> DECODER = (buf, direction, version) -> {
+  public static final Decoder<TitlePacket> DECODER = Decoder.unsupported();
-    throw new UnsupportedOperationException();
-  };
 
   public static TitlePacket hide(final ProtocolVersion version) {
     return version.gte(ProtocolVersion.MINECRAFT_1_11)

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/legacy/LegacyDisconnectPacket.java

@@ -8,7 +8,7 @@ import net.kyori.adventure.text.TextComponent;
 import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
 import net.kyori.adventure.text.serializer.plain.PlainComponentSerializer;
 
-public class LegacyDisconnectPacket {
+public class LegacyDisconnectPacket implements LegacyPacket {
 
   private static final ServerPing.Players FAKE_PLAYERS = new ServerPing.Players(0, 0,
       ImmutableList.of());

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/legacy/LegacyHandshakePacket.java

@@ -6,12 +6,7 @@ import com.velocitypowered.proxy.protocol.Packet;
 import com.velocitypowered.proxy.protocol.ProtocolDirection;
 import io.netty.buffer.ByteBuf;
 
-public class LegacyHandshakePacket implements Packet {
+public class LegacyHandshakePacket implements LegacyPacket, Packet {
-
-  @Override
-  public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    throw new UnsupportedOperationException();
-  }
 
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/legacy/LegacyPacket.java

@@ -0,0 +1,4 @@
+package com.velocitypowered.proxy.protocol.packet.legacy;
+
+public interface LegacyPacket {
+}

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/legacy/LegacyPingPacket.java

@@ -9,7 +9,7 @@ import io.netty.buffer.ByteBuf;
 import java.net.InetSocketAddress;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-public class LegacyPingPacket implements Packet {
+public class LegacyPingPacket implements LegacyPacket, Packet {
 
   private final LegacyMinecraftPingVersion version;
   private final @Nullable InetSocketAddress vhost;
@@ -24,19 +24,6 @@ public class LegacyPingPacket implements Packet {
     this.vhost = vhost;
   }
 
-  public LegacyMinecraftPingVersion getVersion() {
-    return version;
-  }
-
-  public @Nullable InetSocketAddress getVhost() {
-    return vhost;
-  }
-
-  @Override
-  public void decode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
-    throw new UnsupportedOperationException();
-  }
-
   @Override
   public void encode(ByteBuf buf, ProtocolDirection direction, ProtocolVersion version) {
     throw new UnsupportedOperationException();
@@ -46,4 +33,12 @@ public class LegacyPingPacket implements Packet {
   public boolean handle(MinecraftSessionHandler handler) {
     return handler.handle(this);
   }
+
+  public LegacyMinecraftPingVersion getVersion() {
+    return version;
+  }
+
+  public @Nullable InetSocketAddress getVhost() {
+    return vhost;
+  }
 }

proxy/src/main/java/com/velocitypowered/proxy/tablist/VelocityTabList.java

@@ -5,6 +5,7 @@ import com.velocitypowered.api.proxy.player.TabList;
 import com.velocitypowered.api.proxy.player.TabListEntry;
 import com.velocitypowered.api.util.GameProfile;
 import com.velocitypowered.proxy.connection.MinecraftConnection;
+import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import com.velocitypowered.proxy.protocol.packet.HeaderAndFooterPacket;
 import com.velocitypowered.proxy.protocol.packet.PlayerListItemPacket;
 import java.util.ArrayList;
@@ -15,6 +16,7 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
+import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public class VelocityTabList implements TabList {
@@ -31,7 +33,12 @@ public class VelocityTabList implements TabList {
       net.kyori.adventure.text.Component footer) {
     Preconditions.checkNotNull(header, "header");
     Preconditions.checkNotNull(footer, "footer");
-    connection.write(HeaderAndFooterPacket.create(header, footer, connection.getProtocolVersion()));
+    GsonComponentSerializer serializer = ProtocolUtils.getJsonChatSerializer(
+        connection.getProtocolVersion());
+    connection.write(new HeaderAndFooterPacket(
+        serializer.serialize(header),
+        serializer.serialize(footer)
+    ));
   }
 
   @Override

proxy/src/test/java/com/velocitypowered/proxy/protocol/PacketRegistryTest.java

@@ -25,7 +25,7 @@ class PacketRegistryTest {
   private StateRegistry.PacketRegistry setupRegistry() {
     StateRegistry.PacketRegistry registry = new StateRegistry.PacketRegistry(
         ProtocolDirection.CLIENTBOUND);
-    registry.register(HandshakePacket.class, HandshakePacket::new,
+    registry.register(HandshakePacket.class, HandshakePacket.DECODER,
         new StateRegistry.PacketMapping(0x01, MINECRAFT_1_8, false),
         new StateRegistry.PacketMapping(0x00, MINECRAFT_1_12, false));
     return registry;
@@ -63,7 +63,7 @@ class PacketRegistryTest {
     StateRegistry.PacketRegistry registry = new StateRegistry.PacketRegistry(
         ProtocolDirection.CLIENTBOUND);
     assertThrows(IllegalArgumentException.class,
-        () -> registry.register(HandshakePacket.class, HandshakePacket::new));
+        () -> registry.register(HandshakePacket.class, HandshakePacket.DECODER));
     assertThrows(IllegalArgumentException.class,
         () -> registry.getProtocolRegistry(ProtocolVersion.UNKNOWN)
             .getPacketId(new HandshakePacket()));
@@ -74,11 +74,11 @@ class PacketRegistryTest {
     StateRegistry.PacketRegistry registry = new StateRegistry.PacketRegistry(
         ProtocolDirection.CLIENTBOUND);
     assertThrows(IllegalArgumentException.class,
-        () -> registry.register(HandshakePacket.class, HandshakePacket::new,
+        () -> registry.register(HandshakePacket.class, HandshakePacket.DECODER,
             new StateRegistry.PacketMapping(0x01, MINECRAFT_1_13, false),
             new StateRegistry.PacketMapping(0x00, MINECRAFT_1_8, false)));
     assertThrows(IllegalArgumentException.class,
-        () -> registry.register(HandshakePacket.class, HandshakePacket::new,
+        () -> registry.register(HandshakePacket.class, HandshakePacket.DECODER,
             new StateRegistry.PacketMapping(0x01, MINECRAFT_1_13, false),
             new StateRegistry.PacketMapping(0x01, MINECRAFT_1_13, false)));
   }
@@ -87,13 +87,13 @@ class PacketRegistryTest {
   void failOnDuplicate() {
     StateRegistry.PacketRegistry registry = new StateRegistry.PacketRegistry(
         ProtocolDirection.CLIENTBOUND);
-    registry.register(HandshakePacket.class, HandshakePacket::new,
+    registry.register(HandshakePacket.class, HandshakePacket.DECODER,
         new StateRegistry.PacketMapping(0x00, MINECRAFT_1_8, false));
     assertThrows(IllegalArgumentException.class,
-        () -> registry.register(HandshakePacket.class, HandshakePacket::new,
+        () -> registry.register(HandshakePacket.class, HandshakePacket.DECODER,
             new StateRegistry.PacketMapping(0x01, MINECRAFT_1_12, false)));
     assertThrows(IllegalArgumentException.class,
-        () -> registry.registerNew(StatusPingPacket.class, StatusPingPacket.DECODER,
+        () -> registry.register(StatusPingPacket.class, StatusPingPacket.DECODER,
             new StateRegistry.PacketMapping(0x00, MINECRAFT_1_13, false)));
   }
 
@@ -101,7 +101,7 @@ class PacketRegistryTest {
   void shouldNotFailWhenRegisterLatestProtocolVersion() {
     StateRegistry.PacketRegistry registry = new StateRegistry.PacketRegistry(
         ProtocolDirection.CLIENTBOUND);
-    assertDoesNotThrow(() -> registry.register(HandshakePacket.class, HandshakePacket::new,
+    assertDoesNotThrow(() -> registry.register(HandshakePacket.class, HandshakePacket.DECODER,
         new StateRegistry.PacketMapping(0x00, MINECRAFT_1_8, false),
         new StateRegistry.PacketMapping(0x01, getLast(ProtocolVersion.SUPPORTED_VERSIONS),
             false)));
@@ -111,7 +111,7 @@ class PacketRegistryTest {
   void registrySuppliesCorrectPacketsByProtocol() {
     StateRegistry.PacketRegistry registry = new StateRegistry.PacketRegistry(
         ProtocolDirection.CLIENTBOUND);
-    registry.register(HandshakePacket.class, HandshakePacket::new,
+    registry.register(HandshakePacket.class, HandshakePacket.DECODER,
         new StateRegistry.PacketMapping(0x00, MINECRAFT_1_12, false),
         new StateRegistry.PacketMapping(0x01, MINECRAFT_1_12_1, false),
         new StateRegistry.PacketMapping(0x02, MINECRAFT_1_13, false));