Aias00 opened a new issue, #905:
URL: https://github.com/apache/rocketmq-dashboard/issues/905
### What happened?
`RocketMQClientProvider.findProducerConnections` handles a null `TopicList`
response, but not a non-null response whose `topicList` field is null:
```java
topics = topicList == null ? Set.of() : topicList.getTopicList();
...
for (String topic : topics) { ... }
```
If the RocketMQ admin API returns an incomplete `TopicList` body, the
producer connection scan throws `NullPointerException` before it can return an
empty result. That can break the Studio client connection list instead of
degrading cleanly.
### Location
-
`server/src/main/java/org/apache/rocketmq/studio/rocketmq/RocketMQClientProvider.java`
### Expected behavior
The provider should treat a null topic set the same as an empty topic set
and return an empty producer connection list.
### Scope
This is in the RocketMQ Studio CLIENT-01 path for Remoting client connection
discovery.
### Suggested fix
Guard `topicList.getTopicList()` before iterating and add a provider unit
test for the null body case.
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