[ https://issues.jboss.org/browse/DROOLS-987?page=com.atlassian.jira.plugin... ] Mario Fusco commented on DROOLS-987: ------------------------------------ I believe that this problem is caused by drools/jbpm interaction and in particular by the fact that jbpm is triggering a reentrant flushing of the propagation queue as demonstrated by the following stack trace. We need to figure out if we can avoid this reentrant flushing or even better if we can make it safer. {code} org.jbpm.workflow.instance.WorkflowRuntimeException: [droolsTest.RFGAB:47 - :4] -- null at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:179) at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:366) at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:325) at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:44) at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:341) at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:318) at org.jbpm.workflow.instance.node.RuleSetNodeInstance.signalEvent(RuleSetNodeInstance.java:124) at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:490) at org.jbpm.process.instance.event.DefaultSignalManager.internalSignalEvent(DefaultSignalManager.java:82) at org.jbpm.process.instance.event.DefaultSignalManager$SignalAction.execute(DefaultSignalManager.java:181) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:68) at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2003) at org.drools.core.impl.StatefulKnowledgeSessionImpl.executeQueuedActions(StatefulKnowledgeSessionImpl.java:1548) at org.jbpm.process.instance.event.DefaultSignalManager.signalEvent(DefaultSignalManager.java:74) at org.jbpm.process.instance.ProcessRuntimeImpl$3.afterRuleFlowGroupDeactivated(ProcessRuntimeImpl.java:458) at org.drools.core.event.AgendaEventSupport.fireAfterRuleFlowGroupDeactivated(AgendaEventSupport.java:180) at org.drools.core.common.DefaultAgenda.getNextFocus(DefaultAgenda.java:552) at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1341) at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1284) at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1303) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1293) at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1274) at org.drools.test.RulesJUnitTest$1.afterRuleFlowGroupActivated(RulesJUnitTest.java:87) at org.drools.core.event.AgendaEventSupport.fireAfterRuleFlowGroupActivated(AgendaEventSupport.java:152) at org.drools.core.common.DefaultAgenda.activateRuleFlowGroup(DefaultAgenda.java:707) at org.drools.core.common.DefaultAgenda.activateRuleFlowGroup(DefaultAgenda.java:695) at org.jbpm.workflow.instance.node.RuleSetNodeInstance.internalTrigger(RuleSetNodeInstance.java:88) at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:173) at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:366) at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:325) at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:73) at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:44) at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:173) at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35) at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:236) at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:439) at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:208) at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:191) at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:183) at org.drools.core.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:1797) at org.drools.test.RulesJUnitTest$ThreadAB.run(RulesJUnitTest.java:174) Caused by: java.lang.NullPointerException at org.drools.core.common.TupleSetsImpl.setNextTuple(TupleSetsImpl.java:343) at org.drools.core.common.TupleSetsImpl.removeInsert(TupleSetsImpl.java:158) at org.drools.core.common.TupleSetsImpl.addDelete(TupleSetsImpl.java:97) at org.drools.core.reteoo.LeftInputAdapterNode.doDeleteSegmentMemory(LeftInputAdapterNode.java:285) at org.drools.core.reteoo.LeftInputAdapterNode.doDeleteObject(LeftInputAdapterNode.java:256) at org.drools.core.reteoo.LeftInputAdapterNode.retractLeftTuple(LeftInputAdapterNode.java:351) at org.drools.core.reteoo.ObjectTypeNode.doRetractObject(ObjectTypeNode.java:333) at org.drools.core.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:317) at org.drools.core.reteoo.EntryPointNode.propagateRetract(EntryPointNode.java:357) at org.drools.core.phreak.PropagationEntry$Delete.execute(PropagationEntry.java:173) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:78) at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:68) at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2003) at org.drools.core.impl.StatefulKnowledgeSessionImpl.executeQueuedActions(StatefulKnowledgeSessionImpl.java:1548) at org.jbpm.process.instance.event.DefaultSignalManager.signalEvent(DefaultSignalManager.java:74) at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.setState(WorkflowProcessInstanceImpl.java:377) at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.setState(WorkflowProcessInstanceImpl.java:384) at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.nodeInstanceCompleted(WorkflowProcessInstanceImpl.java:592) at org.jbpm.workflow.instance.node.EndNodeInstance.internalTrigger(EndNodeInstance.java:72) at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:173) ... 41 more {code} -- This message was sent by Atlassian JIRA (v6.4.11#64026)