Abhishek Chavan [http://community.jboss.org/people/bezudar] created the discussion "jBPM issue using Persistence and fireUntilHalt" To view the discussion, visit: http://community.jboss.org/message/625191#625191 -------------------------------------------------------------- Hi, I am trying to use the jBPM example for persisting the data and trying to use another thread for rule processing using ksession.fireUntilHalt(); but I am encountering the following exception. Exception in thread "Thread-4" org.drools.RuntimeDroolsException: Unexpected exception executing action org.jbpm.process.instance.event.DefaultSignalManager$SignalAction@1be20c     at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:996)     at org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1037)     at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:777)     at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:753)     at org.drools.command.runtime.rule.FireUntilHaltCommand$1.run(FireUntilHaltCommand.java:50)     at java.lang.Thread.run(Unknown Source) Caused by: java.lang.NullPointerException     at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:43)     at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:106)     at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)     at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:186)     at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:150)     at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:47)     at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:162)     at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:143)     at org.jbpm.workflow.instance.node.RuleSetNodeInstance.signalEvent(RuleSetNodeInstance.java:73)     at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:339)     at org.jbpm.process.instance.event.DefaultSignalManager.internalSignalEvent(DefaultSignalManager.java:80)     at org.jbpm.process.instance.event.DefaultSignalManager$SignalAction.execute(DefaultSignalManager.java:175)     at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:994)     ... 5 more The same is working fine without persistence and another test is running fine with persistence but there i am calling kession.fireAllRules(); explicitly. I have made my model classes serializable. The code used is : public void reactiveProcessAndRulesTest() throws InterruptedException {         KnowledgeBuilder kbuilder = KnowledgeBuilderFactory                 .newKnowledgeBuilder();         kbuilder.add(new ClassPathResource("EmergencyServiceSimple.bpmn"),                 ResourceType.BPMN2);         kbuilder.add(new ClassPathResource("SelectEmergencyVehicleSimple.drl"),                 ResourceType.DRL);         KnowledgeBuilderErrors errors = kbuilder.getErrors();         if (errors.size() > 0) {             for (KnowledgeBuilderError error : errors) {                 System.out.println(error.getMessage());               }             return;         }           KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();         kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());           EntityManagerFactory emf = Persistence                 .createEntityManagerFactory("org.jbpm.task");         Environment env = KnowledgeBaseFactory.newEnvironment();         env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);           final StatefulKnowledgeSession ksession = JPAKnowledgeService                 .newStatefulKnowledgeSession(kbase, null, env); //         ksession = kbase.newStatefulKnowledgeSession();           // Setting the process engine and the rule engine in reactive mode         // This will cause that if a rule is activated, the rule will fire         // without waiting         // the user to call the fireAllRules() method.                   MyHumanChangingValuesSimulatorWorkItemHandler humanActivitiesSimHandler = new MyHumanChangingValuesSimulatorWorkItemHandler();         ksession.getWorkItemManager().registerWorkItemHandler("Human Task",                 humanActivitiesSimHandler);           KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);           Emergency emergency = new Emergency("555-1234");         // Run with Heart Attack and check the output. An Ambulance must appear         // in the report         // emergency.setType("Heart Attack");         // Run with Fire and check the output. A FireTruck must appear in the         // report         emergency.setType("Fire");         Map<String, Object> parameters = new HashMap<String, Object>();         parameters.put("emergency", emergency);           WorkflowProcessInstance process = (WorkflowProcessInstance) ksession                 .startProcess(                         "com.wordpress.salaboy.bpmn2.SimpleEmergencyService",                         parameters);         // My Emergency and My Process are both inserted as Facts / Truths in my         // Knowledge Session         // Now Emergency and the Process Instance can be used by the inference         // engine         ksession.insert(emergency);         ksession.insert(process);                 new Thread(new Runnable() {               public void run() {                                 ksession.fireUntilHalt();             }         }).start();           // Is the Process still Active?         Assert.assertEquals(ProcessInstance.STATE_ACTIVE, process.getState());         // Is there a running node instance?         Assert.assertEquals(1, process.getNodeInstances().size());         // Is the process stopped in the "Ask for Emergency Information"         // activity?         Assert.assertEquals("Ask for Emergency Information", process                 .getNodeInstances().iterator().next().getNodeName());         // Lets check the value of the emergency.getRevision(), it should be 1         Assert.assertEquals(1,                 ((Emergency) process.getVariable("emergency")).getRevision());           System.out.println("Completing the first Activity");         // Complete the first human activity         humanActivitiesSimHandler.completeWorkItem();           // I need to sleep for a little while, because the other thread can be         // executing some activated rules         Thread.sleep(1000);           // Lets check the value of the vehicle variable it should be a Fire         // Truck => Fire         Assert.assertTrue(((Vehicle) process.getVariable("vehicle")) instanceof FireTruck);           // Is the Process still Active?         Assert.assertEquals(ProcessInstance.STATE_ACTIVE, process.getState());         // Is there a running node instance?         Assert.assertEquals(1, process.getNodeInstances().size());         // Is the process stopped in the "Dispatch Vehicle" activity?         Assert.assertEquals("Dispatch Vehicle", process.getNodeInstances()                 .iterator().next().getNodeName());         // Lets check the value of the emergency.getRevision(), it should be 2         Assert.assertEquals(2,                 ((Emergency) process.getVariable("emergency")).getRevision());           System.out.println("Completing the second Activity");         // Complete the second human activity         humanActivitiesSimHandler.completeWorkItem();           // Is the process completed?         Assert.assertEquals(ProcessInstance.STATE_COMPLETED, process.getState());     }     My Full code is in this thread : http://community.jboss.org/message/625081#625081 http://community.jboss.org/message/625081 Any help would be appreciated. I also see very wierd behaviour happening when running the program in Debug mode in eclipse and run mode. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/625191#625191] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]