[java-pubsub] PublisherImplTest.testResumePublish hangs
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@michaelpri10 is already working on this.
Since Jun 9, 2026.
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Description
In the release PR run https://github.com/googleapis/google-cloud-java/actions/runs/27152757144/job/80148008212?pr=13373, the unit test PublisherImplTest in google-cloud-pubsub module got stuck and caused the GHA run to timeout after 6 hours.
Analyzing the job logs of previous timed-out release runs (e.g. https://github.com/googleapis/google-cloud-java/actions/runs/27024407145), the hang consistently occurs inside com.google.cloud.pubsub.v1.PublisherImplTest when running on Java 8 runtime.
Specifically, the testResumePublish test case invokes sendTestMessageWithOrderingKey which triggers a publish call to the mock server FakePublisherServiceImpl. Inside FakePublisherServiceImpl.publish(), it calls publishResponses.take(), which is a blocking queue call. In Java 8 runtime, this blocks the main thread, resulting in a deadlock before testPublisherServiceImpl.addPublishResponse(...) can be called.
This test was previously disabled due to similar timeout issues (Issue #13051) but was recently re-enabled. We need to investigate why it deadlocks under Java 8 and prevent it from hanging.
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