MultithreadTest.testSlidingTimeWindows() uses unreliable Thread.sleep(1). ------------------------------------------------------------------------- Key: DROOLS-748 URL: https://issues.jboss.org/browse/DROOLS-748 Project: Drools Issue Type: Bug Reporter: Tibor Zimányi Assignee: Mark Proctor Priority: Minor In MultithreadTest classes (there are two of them) method testSlidingTimeWindows() uses unreliable Thread.sleep(1) call for waiting for fact insertion. Thread.sleep(1) doesn't wait for exactly 1 millisecond, because there is overhead from thread scheduler. This overhead can be pretty large in contrast to expected 1ms sleep.