Use our own promise to work around @netty pipeline issues

proxy/src/main/java/net/md_5/bungee/netty/ChannelWrapper.java

@@ -9,17 +9,19 @@ public class ChannelWrapper
     private final Channel ch;
     @Getter
     private volatile boolean closed;
+    private final ReusableChannelPromise promise;
 
     public ChannelWrapper(Channel ch)
     {
         this.ch = ch;
+        this.promise = new ReusableChannelPromise( ch );
     }
 
     public synchronized void write(Object packet)
     {
         if ( !closed )
         {
-            ch.write( packet, ch.voidPromise() );
+            ch.write( packet, promise );
         }
     }
 

proxy/src/main/java/net/md_5/bungee/netty/ReusableChannelPromise.java

@@ -0,0 +1,179 @@
+package net.md_5.bungee.netty;
+
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelPromise;
+import io.netty.util.concurrent.Future;
+import io.netty.util.concurrent.GenericFutureListener;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public class ReusableChannelPromise implements ChannelPromise
+{
+
+    private final Channel ch;
+
+    @Override
+    public Channel channel()
+    {
+        return ch;
+    }
+
+    @Override
+    public ChannelPromise setSuccess(Void result)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise setSuccess()
+    {
+        return this;
+    }
+
+    @Override
+    public boolean trySuccess()
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise setFailure(Throwable cause)
+    {
+        return this;
+    }
+
+    @Override
+    public ChannelPromise addListener(GenericFutureListener<? extends Future<Void>> listener)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise addListeners(GenericFutureListener<? extends Future<Void>>... listeners)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise removeListener(GenericFutureListener<? extends Future<Void>> listener)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise removeListeners(GenericFutureListener<? extends Future<Void>>... listeners)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise sync() throws InterruptedException
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise syncUninterruptibly()
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise await() throws InterruptedException
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public ChannelPromise awaitUninterruptibly()
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean isSuccess()
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public Throwable cause()
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean await(long timeout, TimeUnit unit) throws InterruptedException
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean await(long timeoutMillis) throws InterruptedException
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean awaitUninterruptibly(long timeout, TimeUnit unit)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean awaitUninterruptibly(long timeoutMillis)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public Void getNow()
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean cancel(boolean mayInterruptIfRunning)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean isCancelled()
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean isDone()
+    {
+        return false;
+    }
+
+    @Override
+    public Void get() throws InterruptedException, ExecutionException
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public Void get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean trySuccess(Void result)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+
+    @Override
+    public boolean tryFailure(Throwable cause)
+    {
+        throw new UnsupportedOperationException( "Not supported yet." );
+    }
+}