[jboss-user] [jBPM] - Re: A question about rule task in jBPM5

[Jing Zhang]

Jing Zhang [http://community.jboss.org/people/zhangjing2000] created the discussion

"Re: A question about rule task in jBPM5"

To view the discussion, visit: http://community.jboss.org/message/592273#592273

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Thanks Mauricio,
I found in your example, you used a new thread to call fireUntilHalt, but it caused a NPE in my code during call to internalExecuteWorkItem method in JPAWorkItemManager. I wonder if the new thread won't able to leverage the JPA context from main thread. 



Exception in thread "Thread-12" org.drools.RuntimeDroolsException: Unexpected exception executing action org.jbpm.process.instance.event.DefaultSignalManager$SignalAction at 1b9da92
          at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1000)
          at org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1044)
          at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:780)
          at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:756)
          at org.drools.command.runtime.rule.FireUntilHaltCommand$1.run(FireUntilHaltCommand.java:50)
          at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
 at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:43)
          at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:101)
          at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
          at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:185)
          at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:150)
          at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:47)
          at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:162)
          at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:143)
          at org.jbpm.workflow.instance.node.RuleSetNodeInstance.signalEvent(RuleSetNodeInstance.java:73)
          at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:339)
          at org.jbpm.process.instance.event.DefaultSignalManager.internalSignalEvent(DefaultSignalManager.java:80)
          at org.jbpm.process.instance.event.DefaultSignalManager$SignalAction.execute(DefaultSignalManager.java:175)
          at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:998)
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