runzhiwang opened a new pull request #222: [LIVY-647]Fix travis failed on batch session should not be gc-ed until application is finished URL: https://github.com/apache/incubator-livy/pull/222 ## What changes were proposed in this pull request? Fix travis failed on "batch session should not be gc-ed until application is finished" The cause of failed is as follows: 1. When create BatchSessionManager, the GarbageCollector thread will be created, which collect garbage according to session.state. However the session was mocked, and the test thread execute doReturn(s).when(session).state several times, if the test thread do half of the statement doReturn(s).when(session).state, and GarbageCollector thread check session.state at this time, the exception will threw by GarbageCollector thread. 2. So the fix avoid collecting garbage of mocked session. 3. Modify the test can also fix this bug, but it cannot avoid the similar bug happening in the future. ## How was this patch tested? Existed UT and IT.
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