hah1346798520 opened a new issue #3715:
URL: https://github.com/apache/rocketmq/issues/3715
**BUG REPORT**
1.start Namesrv
2.start broker
3.sendmsg and it work
```
DefaultMQProducer producer = new
DefaultMQProducer("ProducerGroupName");
producer.setNamesrvAddr("127.0.0.1:9876");
producer.start();
Message msg = new Message("RMQ_SYS_TRACE_TOPIC",
"TagA",
"OrderID188",
"Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));
SendResult sendResult = producer.send(msg);
```
4.environment:
autoCreateTopicEnable = true
traceTopicEnable = false
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