123123213weqw opened a new pull request, #748:
URL: https://github.com/apache/rocketmq-dashboard/pull/748
### Problem
`DashboardServiceImpl.queryTopicCurrentData` iterated the topic cache and,
for every entry, called:
```java
result.add(entry.getKey() + "," + value.get(value.size() - 1).split(",")[4]);
```
A topic that has **no collected data points yet** maps to an empty list, so
`value.size() - 1` is `-1` and `value.get(-1)` throws
`IndexOutOfBoundsException`. Because there is no try/catch, the entire
`queryTopicCurrentData` endpoint fails as soon as one topic has an empty data
list.
### Fix
Skip entries whose value list is `null` or empty before indexing the last
element.
### Verification
`mvn compiler:compile` passes (`BUILD SUCCESS`).
### Diff
1 file changed, +4.
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