TheNeuralBit opened a new pull request #13345: URL: https://github.com/apache/beam/pull/13345
I haven't found evidence that this is the cause but I strongly suspect the cause of the NPE on this line: https://github.com/apache/beam/blob/43e8b990b19d9ad3031b06e3c3dea508d0916d93/sdks/java/harness/src/test/java/org/apache/beam/fn/harness/logging/BeamFnLoggingClientTest.java#L162 is that the `Logger` corresponding to `"ConfiguredLogger"` has been GC'd. The javadoc for `Logger.getLogger` notes: > Note: The LogManager may only retain a weak reference to the newly created Logger. It is important to understand that a previously created Logger with the given name may be garbage collected at any time if there is no strong reference to the Logger. Once the client is closed the only reference to the logger is removed and there's the possibility it's been GC'd. This PR also removes warning suppression in BeamFnLoggingClient. 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