问题总结：
1. 客户端访问超时
com.alibaba.dubbo.remoting.TimeoutException: Waiting server-side response timeout.
start time: 2019-07-01 23:12:02.396, end time: 2019-07-01 23:12:03.398, client elapsed: 1 ms, server elapsed: 1001 ms, timeout: 1000 ms,
解决，在客户端的配置文件中增加超时配置
<dubbo:consumer timeout="180000" retries="3" />
2. 启动客户端时报错，8080端口被占用
*************************** APPLICATION FAILED TO START *************************** Description: The Tomcat connector configured to listen on port 8080 failed to start. The port may already be in use or the connector may be misconfigured. Action: Verify the connector's configuration, identify and stop any process that's listening on port 8080, or configure this application to listen on another port.
解决，修改配置文件application.properties中默认的Tomcat端口为8081
server.port=8081