title: Netty - An exceptionCaught() event was fired, and it reached at the tail of the pipeline
body: <p>I got this warning in my log:</p>
  
  <pre><code>Nov 02, 2016 12:07:20 AM io.netty.channel.DefaultChannelPipeline onUnhandledInboundException
  WARNUNG: An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
  java.util.concurrent.TimeoutException
  </code></pre>
  
  <p>That are my ChannelHandlers:</p>
  
  <pre><code>@Override
  public void initChannel(SocketChannel ch) throws Exception {
      ch.pipeline().addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
      ch.pipeline().addLast(new TimeoutHandler(TIME_OUT_SECONDS));
      ch.pipeline().addLast(new ServerCommunicationHandler(messageHandler));
  }
  </code></pre>
  
  <p>My TimeoutHandler throws a TimeoutException if there was no read for the last 15 seconds.
  And in my last handler, the ServerCommunicationHandler, i have overridden the exeptionCaught function:</p>
  
  <pre><code>@Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
      ctx.close();
  }
  </code></pre>
  
  <p>So if i understand right, i do not rethrow the exception to the end of the pipeline, because my last handler processes the exception correctly, doesn't it?</p>
  
  <p>Why do i get this warning?</p>
  
  <p>I use Netty 4.1.6.Final</p>