title: How to catch all exception in netty
body: <p>As far as I know netty handle exceptions by override method exceptionCaught(). But what I want is a Handler that can handler all exceptions in or out. So, the pipeline should be like :</p>
  
  <p>InboundExceptionHandler - inboundHandler1 - inboundHandler2 - outboundHandler1 - outboundHandler2 - OutboundExceptionHandler</p>
  
  <p>That means I should place 2 exception Handler in my pipeline separated in head and tail. But I think it looks ugly. any better idea?</p>