EdwardLee03 commented on issue #427: message can not send, because channel is closed and com.alibaba.dubbo.rpc.RpcException: Failed to invoke the method URL: https://github.com/apache/incubator-dubbo/issues/427#issuecomment-378135895 我们遇到给问题的场景是 测试同学通过异步调用的方式测试Dubbo同步调用的服务，单测跑完了，但测试的异步回调还在尝试获取结果，就触发了这个问题。 ``` Caused by: com.alibaba.dubbo.remoting.RemotingException: message can not send, because channel is closed. ``` 问题原因是**调用通道已关闭引起服务方法调用失败**。
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