org.apache.mina.core.session.UnknownMessageTypeException: No handler found for message type:

根据打印的错误信息：at org.apache.mina.handler.demux.DemuxingIoHandler.messageSent(DemuxingIoHandler.java:253)

找不到handler  ,因为有类ServerHandler extends DemuxingIoHandler 而在addSentMessageHandler这个方法没有添加对应的类型和handler,所以报错

public ServerHandle(){
MessageObjectInnerHandler handler = new MessageObjectInnerHandler();
addReceivedMessageHandler(MessageObject.class, handler);

}

重写方法messageSent  ，注释掉super.messageSent(session, message)，这样发送的时候就不会调用messageSent，验证消息类型了。

@Override
public void messageSent(IoSession session, Object message) throws Exception {
// TODO Auto-generated method stub
//super.messageSent(session, message);
}