JPAKnowledgeService stops to work suddenly ------------------------------------------ Key: DROOLS-264 URL: https://issues.jboss.org/browse/DROOLS-264 Project: Drools Issue Type: Bug Affects Versions: 5.5.0.Final Environment: PostgreSQL 8.4 Linux Ubuntu JBoss 5.1.0 Reporter: Nedo Nedic Assignee: Mario Fusco From time to time, while facts are being inserted into session and persisted in database, the following exception occurs. The session is no more updated because SQL sentences can't be executed anymore. Sometimes, when session is restored from marshalled snapshot the same error happens. 2013-09-17 11:17:03,959 ERROR [org.drools.persistence.jpa.JpaTimerJobInstance] Unable to execute timer job! java.lang.RuntimeException: Unable to load session snapshot at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:96) at org.drools.persistence.SingleSessionCommandService.initKsession(SingleSessionCommandService.java:269) at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:369) at org.drools.persistence.jpa.JpaTimerJobInstance.call(JpaTimerJobInstance.java:34) at org.drools.time.impl.DefaultTimerJobInstance.call(DefaultTimerJobInstance.java:1) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.NullPointerException at org.drools.time.impl.JDKTimerService.removeJob(JDKTimerService.java:133) at org.drools.common.Scheduler.removeAgendaItem(Scheduler.java:75) at org.drools.common.DefaultAgenda.removeScheduleItem(DefaultAgenda.java:474) at org.drools.common.DefaultAgenda.removeActivation(DefaultAgenda.java:349) at org.drools.common.DefaultAgenda.cancelActivation(DefaultAgenda.java:687) at org.drools.reteoo.RuleTerminalNode.retractLeftTuple(RuleTerminalNode.java:320) at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:224) at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:98) at org.drools.reteoo.NotNode.propagateRetractLeftTuple(NotNode.java:444) at org.drools.reteoo.NotNode.assertObject(NotNode.java:142) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:364) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235) at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240) at org.drools.marshalling.impl.ProtobufInputMarshaller.assertHandleIntoOTN(ProtobufInputMarshaller.java:483) at org.drools.marshalling.impl.ProtobufInputMarshaller.readFactHandles(ProtobufInputMarshaller.java:459) at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:259) at org.drools.marshalling.impl.ProtobufInputMarshaller.readSession(ProtobufInputMarshaller.java:116) at org.drools.marshalling.impl.ProtobufMarshaller.unmarshall(ProtobufMarshaller.java:143) at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:88) ... 11 more