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com.alibaba.dubbo.rpc.RpcException: No provider available from registry 127.0.0.1:2181 for service com.alibaba.dubbo.monitor.MonitorService on consumer 192.168.56.1 use dubbo version 2.5.6, may be providers disabled or not registered ?
原因：
没有启动 dubbo Simple Monitor，或dubbo Simple Monitor没有连上Zookeeper注册中心。
启动dubbo simple monitor后则不会再出现上述提示，而是出现 连通了monitor的相关提示信息。
[DUBBO] Send statistics to monitor zookeeper://127.0.0.1:2181/com.alibaba.dubbo.monitor.MonitorService?anyhost=true&application=simple-monitor&check=false&delay=-1&dubbo=2.5.6&interface=com.alibaba.dub