smipo opened a new issue #2239:
URL: https://github.com/apache/rocketmq/issues/2239
第一次运行Producer，过了几秒 提示 java.lang.IllegalStateException:
org.apache.rocketmq.remoting.exception.RemotingConnectException: connect to
null failed的错误，很懵逼，百度了下才发现需要设置
producer.setNamesrvAddr("127.0.0.1:9876")，这个参数是必须的，但是又不是构造函数强制构造的，且运行几秒后才给提示connect
to null failed，对于新手非常懵逼。
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