Whats this? It compiles. Doesn't mean it near works though.

proxy/src/main/java/net/md_5/bungee/UserConnection.java

@@ -52,8 +52,10 @@ public final class UserConnection implements ProxiedPlayer
     @Getter
     private final Object switchMutex = new Object();
 
-    public UserConnection(Channel channel, PendingConnection pendingConnection, Packet2Handshake handshake, Packet1Login forgeLogin, List<PacketFAPluginMessage> loginMessages)
+    public UserConnection(BungeeCord bungee, Channel channel, PendingConnection pendingConnection, Packet2Handshake handshake, Packet1Login forgeLogin, List<PacketFAPluginMessage> loginMessages)
     {
+        this.bungee = bungee;
+        this.ch = channel;
         this.handshake = handshake;
         this.pendingConnection = pendingConnection;
         this.forgeLogin = forgeLogin;

proxy/src/main/java/net/md_5/bungee/connection/InitialHandler.java

@@ -142,7 +142,7 @@ public class InitialHandler extends PacketHandler implements PendingConnection
     {
         Preconditions.checkState( thisState == State.LOGIN, "Not expecting LOGIN" );
 
-        UserConnection userCon = new UserConnection( socket, this, stream, handshake, forgeLogin, loginMessages );
+        UserConnection userCon = new UserConnection( (BungeeCord) bungee, ch, this, handshake, forgeLogin, loginMessages );
         ServerInfo server = bungee.getReconnectHandler().getServer( userCon );
         userCon.connect( server );
 

proxy/src/main/java/net/md_5/bungee/packet/DefinedPacket.java

@@ -1,6 +1,5 @@
 package net.md_5.bungee.packet;
 
-import com.google.common.base.Preconditions;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ReferenceCounted;
 import io.netty.buffer.Unpooled;
@@ -21,26 +20,20 @@ public abstract class DefinedPacket implements ByteBuf
     {
         ByteBuf.class, ReferenceCounted.class
     })
-    private ByteBuf out;
+    private ByteBuf buf;
-    /**
-     * Packet id.
-     */
-    public final int id;
 
-    public DefinedPacket(int id, byte[] buf)
+    public DefinedPacket(int id, ByteBuf buf)
     {
-        out = Unpooled.wrappedBuffer( buf );
+        this.buf = buf;
         if ( readUnsignedByte() != id )
         {
             throw new IllegalArgumentException( "Wasn't expecting packet id " + Util.hex( id ) );
         }
-        this.id = id;
     }
 
     public DefinedPacket(int id)
     {
-        out = Unpooled.buffer();
+        buf = Unpooled.buffer();
-        this.id = id;
         writeByte( id );
     }
 
@@ -90,6 +83,8 @@ public abstract class DefinedPacket implements ByteBuf
     public abstract void handle(PacketHandler handler) throws Exception;
     @SuppressWarnings("unchecked")
     private static Class<? extends DefinedPacket>[] classes = new Class[ 256 ];
+    @SuppressWarnings("unchecked")
+    private static Constructor<? extends DefinedPacket>[] consructors = new Constructor[ 256 ];
 
     public static DefinedPacket packet(ByteBuf buf)
     {
@@ -100,7 +95,13 @@ public abstract class DefinedPacket implements ByteBuf
         {
             try
             {
-                Constructor<? extends DefinedPacket> constructor = clazz.getDeclaredConstructor( byte[].class );
+                Constructor<? extends DefinedPacket> constructor = consructors[id];
+                if ( constructor == null )
+                {
+                    constructor = clazz.getDeclaredConstructor( ByteBuf.class );
+                    consructors[id] = constructor;
+                }
+
                 if ( constructor != null )
                 {
                     ret = constructor.newInstance( buf );
@@ -108,12 +109,8 @@ public abstract class DefinedPacket implements ByteBuf
             } catch ( IllegalAccessException | InstantiationException | InvocationTargetException | NoSuchMethodException ex )
             {
             }
-        } else
-        {
-            return null;
         }
 
-        Preconditions.checkState( ret != null, "Don't know how to deal with packet ID %s", Util.hex( id ) );
         return ret;
     }
 

proxy/src/main/java/net/md_5/bungee/packet/Packet0KeepAlive.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -10,9 +11,9 @@ public class Packet0KeepAlive extends DefinedPacket
 
     public int id;
 
-    public Packet0KeepAlive(byte[] buffer)
+    public Packet0KeepAlive(ByteBuf buf)
     {
-        super( 0x00, buffer );
+        super( 0x00, buf );
         id = readInt();
     }
 

proxy/src/main/java/net/md_5/bungee/packet/Packet1Login.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -28,7 +29,7 @@ public class Packet1Login extends DefinedPacket
         writeByte( maxPlayers );
     }
 
-    public Packet1Login(byte[] buf)
+    public Packet1Login(ByteBuf buf)
     {
         super( 0x01, buf );
         this.entityId = readInt();

proxy/src/main/java/net/md_5/bungee/packet/Packet2Handshake.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -22,7 +23,7 @@ public class Packet2Handshake extends DefinedPacket
         writeInt( port );
     }
 
-    public Packet2Handshake(byte[] buf)
+    public Packet2Handshake(ByteBuf buf)
     {
         super( 0x02, buf );
         this.procolVersion = readByte();

proxy/src/main/java/net/md_5/bungee/packet/Packet3Chat.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -16,7 +17,7 @@ public class Packet3Chat extends DefinedPacket
         writeString( message );
     }
 
-    public Packet3Chat(byte[] buf)
+    public Packet3Chat(ByteBuf buf)
     {
         super( 0x03, buf );
         this.message = readString();

proxy/src/main/java/net/md_5/bungee/packet/Packet9Respawn.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -26,7 +27,7 @@ public class Packet9Respawn extends DefinedPacket
         writeString( levelType );
     }
 
-    public Packet9Respawn(byte[] buf)
+    public Packet9Respawn(ByteBuf buf)
     {
         super( 0x09, buf );
         this.dimension = readInt();

proxy/src/main/java/net/md_5/bungee/packet/PacketC9PlayerListItem.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -12,9 +13,9 @@ public class PacketC9PlayerListItem extends DefinedPacket
     public boolean online;
     public int ping;
 
-    public PacketC9PlayerListItem(byte[] packet)
+    public PacketC9PlayerListItem(ByteBuf buf)
     {
-        super( 0xC9, packet );
+        super( 0xC9, buf );
         username = readString();
         online = readBoolean();
         ping = readShort();

proxy/src/main/java/net/md_5/bungee/packet/PacketCDClientStatus.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -21,7 +22,7 @@ public class PacketCDClientStatus extends DefinedPacket
         writeByte( payload );
     }
 
-    public PacketCDClientStatus(byte[] buf)
+    public PacketCDClientStatus(ByteBuf buf)
     {
         super( 0xCD, buf );
     }

proxy/src/main/java/net/md_5/bungee/packet/PacketFAPluginMessage.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -20,7 +21,7 @@ public class PacketFAPluginMessage extends DefinedPacket
         this.data = data;
     }
 
-    public PacketFAPluginMessage(byte[] buf)
+    public PacketFAPluginMessage(ByteBuf buf)
     {
         super( 0xFA, buf );
         this.tag = readString();

proxy/src/main/java/net/md_5/bungee/packet/PacketFCEncryptionResponse.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -25,7 +26,7 @@ public class PacketFCEncryptionResponse extends DefinedPacket
         writeArray( verifyToken );
     }
 
-    public PacketFCEncryptionResponse(byte[] buf)
+    public PacketFCEncryptionResponse(ByteBuf buf)
     {
         super( 0xFC, buf );
         this.sharedSecret = readArray();

proxy/src/main/java/net/md_5/bungee/packet/PacketFDEncryptionRequest.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -23,7 +24,7 @@ public class PacketFDEncryptionRequest extends DefinedPacket
         this.verifyToken = verifyToken;
     }
 
-    public PacketFDEncryptionRequest(byte[] buf)
+    public PacketFDEncryptionRequest(ByteBuf buf)
     {
         super( 0xFD, buf );
         serverId = readString();

proxy/src/main/java/net/md_5/bungee/packet/PacketFEPing.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -8,9 +9,12 @@ import lombok.ToString;
 public class PacketFEPing extends DefinedPacket
 {
 
-    public PacketFEPing(byte[] buffer)
+    public byte version;
+
+    public PacketFEPing(ByteBuf buffer)
     {
         super( 0xFE, buffer );
+        version = readByte();
     }
 
     @Override

proxy/src/main/java/net/md_5/bungee/packet/PacketFFKick.java

@@ -1,5 +1,6 @@
 package net.md_5.bungee.packet;
 
+import io.netty.buffer.ByteBuf;
 import lombok.EqualsAndHashCode;
 import lombok.ToString;
 
@@ -16,7 +17,7 @@ public class PacketFFKick extends DefinedPacket
         writeString( message );
     }
 
-    public PacketFFKick(byte[] buf)
+    public PacketFFKick(ByteBuf buf)
     {
         super( 0xFF, buf );
         this.message = readString();