GitHub user cpupg added a comment to the discussion: 发送消息报错No topic route info
namesrv在哪里配？监控台创建topic时没有相关表单，启动broker时已经给了namserv参数。
刚才试了下，监控台启动后日志里一直刷异常：
```
java.lang.NullPointerException: Cannot invoke
"com.alibaba.fastjson.JSONObject.entrySet()" because "json" is null
at
org.apache.rocketmq.dashboard.service.impl.DashboardCollectServiceImpl.jsonDataFile2map(DashboardCollectServiceImpl.java:118)
at
org.apache.rocketmq.dashboard.task.DashboardCollectTask.saveData(DashboardCollectTask.java:179)
at
java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at
org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84)
at
org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at
org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:95)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at
java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
```
不过使用工具类创建的topic还是可以正常使用：
```shell
sh bin/tools.sh org.apache.rocketmq.example.quickstart.Consumer
sh bin/tools.sh org.apache.rocketmq.example.quickstart.Produce
```
GitHub link:
https://github.com/apache/rocketmq/discussions/8008#discussioncomment-9119463
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