[ovirt-devel] Line of death for tests

Hi! I've found yesterday a very strange bug, most likely in Mockito. Hard to believe it really happens, but I've reproduced it in different environmentы and several revisions of oVirt master. I've added the following line into MigrateVmCommand: private Integer actualDowntime; + private Object actualDowntimeLock; This line causes ALL tests to fail with NullPointerException. Some tests print such a stack trace: java.lang.NullPointerException at org.mockito.internal.junit.util.TestName.getTestName(TestName.java:11) at org.mockito.internal.junit.MismatchReportingTestListener.testFinished(MismatchReportingTestListener.java:29) at org.mockito.internal.runners.DefaultInternalRunner$1$1.testFinished(DefaultInternalRunner.java:56) at org.junit.runner.notification.SynchronizedRunListener.testFinished(SynchronizedRunListener.java:56) at org.junit.runner.notification.RunNotifier$7.notifyListener(RunNotifier.java:190) ... Name of the field doesn't matter, but type matters - changing the type to Integer solved the problem. Does anybody has an idea why this happens and how to fix it? Shmuel