Duansg opened a new pull request, #3448:
URL: https://github.com/apache/hertzbeat/pull/3448
## What's changed?
In the `Bulletin` list, if there is a deleted `Monitor`, the page and system
will throw an exception. Although I can manually delete it, I expect the page
to function normally
```
2025-06-10 09:42:39.952 [http-nio-1157-exec-1] ERROR
org.apache.hertzbeat.manager.support.GlobalExceptionHandler Line:252 -
[monitor]-[unknown error happen]-Cannot invoke
"org.apache.hertzbeat.common.entity.manager.Monitor.getName()" because
"monitor" is null
java.lang.NullPointerException: Cannot invoke
"org.apache.hertzbeat.common.entity.manager.Monitor.getName()" because
"monitor" is null
at
org.apache.hertzbeat.manager.service.impl.BulletinServiceImpl.buildBulletinMetricsData(BulletinServiceImpl.java:125)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method) at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568) at
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:359)
```
<img width="1511" alt="iShot_2025-06-10_09 43 35"
src="https://github.com/user-attachments/assets/53a969cd-fee6-432a-b1b3-7910c32a5fe3";
/>
Added a null check validation; if `Monitor` is null, subsequent logic will
not be executed
## Checklist
- [x] I have read the [Contributing
Guide](https://hertzbeat.apache.org/docs/community/code_style_and_quality_guide)
- [x] I have written the necessary doc or comment.
- [x] I have added the necessary unit tests and all cases have passed.
## Add or update API
- [ ] I have added the necessary [e2e
tests](https://github.com/apache/hertzbeat/tree/master/e2e) and all cases have
passed.
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