Apoorv-R98 opened a new pull request, #521:
URL: https://github.com/apache/felix-dev/pull/521
## Summary
`Log.serviceChanged()` throws a `NullPointerException` when
`ServiceReference.getBundle()` returns `null` during service event processing.
Per the OSGi spec, `ServiceReference.getBundle()` returns `null` when the
registering bundle has already been unregistered. This is a known race
condition during service unregistration, but the Felix log layer does not guard
against it, resulting in a misleading ERROR-level NPE in logs.
## Fix
Extract the bundle reference and return early if null in
`Log.serviceChanged()`:
```java
final Bundle bundle = event.getServiceReference().getBundle();
if (bundle == null)
{
return;
}
```
Note: `event.getServiceReference()` itself is guaranteed non-null by
`EventObject`'s constructor, so only the bundle needs to be null-checked.
## Related
- https://issues.apache.org/jira/browse/FELIX-6845
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