acceptor.setHandler(new IoHandlerAdapter());
InetSocketAddress addr = new InetSocketAddress("localhost",
AvailablePortFinder.getNextAvailable(20000));
acceptor.bind(addr);
ConnectFuture future = connector.connect(addr);
future.awaitUninterruptibly();
IoSession session = future.getSession();
WriteFuture wf = session.write(IoBuffer.allocate(1)).awaitUninterruptibly();
assertNotNull(wf.getException());