yswwpp opened a new issue #2046: 使用Qos的一些问题 URL: https://github.com/apache/incubator-dubbo/issues/2046 在使用qos的时候发现22222端口始终没有被监听，调试才知道是启动qos服务的时候报错了，缺少netty相关的包，但是从日志中没有任何迹象。分析代码，类org.apache.dubbo.qos.protocol.QosProtocolWrapper中方法 ```java private void startQosServer(URL url) { if (!hasStarted.compareAndSet(false, true)) { return; } try { boolean qosEnable = Boolean.parseBoolean(url.getParameter(QOS_ENABLE,"true")); if (!qosEnable) { return; } int port = Integer.parseInt(url.getParameter(QOS_PORT,"22222")); boolean acceptForeignIp = Boolean.parseBoolean(url.getParameter(ACCEPT_FOREIGN_IP,"true")); Server server = Server.getInstance(); server.setPort(port); server.setAcceptForeignIp(acceptForeignIp); server.start(); } catch (Throwable throwable) { //throw new RpcException("fail to start qos server", throwable); } } ``` 其中 ```java Server server = Server.getInstance(); ```报错之后，到catch中，结果日志也没有、异常也没上抛！！！ 报错的那段代码虽然简单，但是有netty的依赖关系，所以还是存在报错的可能，建议此处catch之后打印一个警告级别的日志，用户可以清晰的看到为什么qos服务没有启动。
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