Cyril Sochor created JBRULES-3528: ------------------------------------- Summary: Deadlock when using pseudo session clock Key: JBRULES-3528 URL: https://issues.jboss.org/browse/JBRULES-3528 Project: Drools Issue Type: Bug Security Level: Public (Everyone can see) Components: drools-core (fusion) Affects Versions: 5.4.0.Final, 5.3.0.Final Reporter: Cyril Sochor Assignee: Mark Proctor Deadlock when using fireUntilHalt in one thread and PseudoClockScheduler.advanceTime() in second thread. Surroundings: I read many events from JMS queue, each event has timestamp. I need temporal operations measured by time in timestamps. E.g. SomeEvent() over window:time(10s) means events with timestamps in interval 10s, not events inserted in interval 10s. So, I must use pseudo session clock and advance time before event insert into statefull session. Sometimes deadlock occured or NullPointerException is thrown. I created test case. Deadlock stacktraces: Name: Thread-1 State: BLOCKED on org.drools.time.impl.PseudoClockScheduler@4599d5b owned by: Thread-0 Total blocked: 6 Total waited: 3 Stack trace: org.drools.time.impl.PseudoClockScheduler.getCurrentTime(PseudoClockScheduler.java:104) org.drools.common.AbstractWorkingMemory.endOperation(AbstractWorkingMemory.java:1345) org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1240) - locked org.drools.common.DefaultAgenda@57e2793d org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1126) org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1327) org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:754) - locked org.drools.reteoo.ReteooStatefulSession@31d8d237 org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:730) org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:245) org.drools.integrationtests.StreamsTest$1.run(StreamsTest.java:526) java.lang.Thread.run(Thread.java:662) Name: Thread-0 State: BLOCKED on org.drools.common.DefaultAgenda@57e2793d owned by: Thread-1 Total blocked: 2 Total waited: 0 Stack trace: org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1168) org.drools.common.Scheduler$ActivationTimerJob.execute(Scheduler.java:86) org.drools.time.impl.DefaultTimerJobInstance.call(DefaultTimerJobInstance.java:47) org.drools.time.impl.DefaultTimerJobInstance.call(DefaultTimerJobInstance.java:1) org.drools.time.impl.PseudoClockScheduler.runCallBacks(PseudoClockScheduler.java:203) org.drools.time.impl.PseudoClockScheduler.advanceTime(PseudoClockScheduler.java:156) - locked org.drools.time.impl.PseudoClockScheduler@4599d5b org.drools.integrationtests.StreamsTest.processStocks(StreamsTest.java:533) org.drools.integrationtests.StreamsTest.testEvenFirePseudoClockRulesAB(StreamsTest.java:500) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) org.junit.internal.runners.statements.FailOnTimeout$1.run(FailOnTimeout.java:28) -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.jboss.org/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira