NPE in stateful session ------------------------ Key: DROOLS-1472 URL: https://issues.jboss.org/browse/DROOLS-1472 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.5.0.Final Environment: RedHat 6.2, Java 8.102 Reporter: Michael Neifeld Assignee: Mario Fusco Priority: Critical Found NPE in a log that probably leads to session destroying. CEP works in multithreaded environment and there are almost always 16 drools-workers thread. 2017-03-05 16:30:58 com.mot.ssol.cep.workflow.CEPSession [ERROR] Session execution error occurred java.lang.NullPointerException: null at org.drools.core.phreak.RuleNetworkEvaluator.deleteChildLeftTuple(RuleNetworkEvaluator.java:729) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.RuleNetworkEvaluator.unlinkAndDeleteChildLeftTuple(RuleNetworkEvaluator.java:721) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.PhreakNotNode.doRightUpdates(PhreakNotNode.java:343) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.PhreakNotNode.doNode(PhreakNotNode.java:74) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:524) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:505) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:341) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:301) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:136) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.AddRemoveRule.forceFlushLeftTuple(AddRemoveRule.java:686) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.AddRemoveRule.flushLeftTupleIfNecessary(AddRemoveRule.java:629) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.LeftInputAdapterNode.doInsertSegmentMemory(LeftInputAdapterNode.java:225) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.LeftInputAdapterNode.doInsertObject(LeftInputAdapterNode.java:210) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:169) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:63) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:134) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:134) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.AlphaNode.assertObject(AlphaNode.java:134) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:494) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:384) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.reteoo.ObjectTypeNode.propagateAssert(ObjectTypeNode.java:304) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.PropagationEntry$Insert.execute(PropagationEntry.java:134) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:86) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:81) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2105) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1296) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1232) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:1398) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:1377) ~[drools-core-6.5.0.Final.jar:6.5.0.Final] at com.mot.ssol.cep.workflow.CEPSession.run(CEPSession.java:121) ~[mimonitor-cepm-3.0.jar:3.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_102] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_102] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_102]