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Re: A question about rule task in jBPM5
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created by <a href="http://community.jboss.org/people/zhangjing2000">Jing Zhang</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/592273#592273">View the full discussion</a>
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<div class="jive-rendered-content"><p>Thanks Mauricio,</p><p>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. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Exception in thread "Thread-12" org.drools.RuntimeDroolsException: Unexpected exception executing action org.jbpm.process.instance.event.DefaultSignalManager$SignalAction@1b9da92</p><p>          at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1000)</p><p>          at org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1044)</p><p>          at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:780)</p><p>          at org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:756)</p><p>          at org.drools.command.runtime.rule.FireUntilHaltCommand$1.run(FireUntilHaltCommand.java:50)</p><p>          at java.lang.Thread.run(Unknown Source)</p><p>Caused by: java.lang.NullPointerException</p><p> at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:43)</p><p>          at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:101)</p><p>          at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)</p><p>          at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:185)</p><p>          at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:150)</p><p>          at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:47)</p><p>          at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:162)</p><p>          at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:143)</p><p>          at org.jbpm.workflow.instance.node.RuleSetNodeInstance.signalEvent(RuleSetNodeInstance.java:73)</p><p>          at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:339)</p><p>          at org.jbpm.process.instance.event.DefaultSignalManager.internalSignalEvent(DefaultSignalManager.java:80)</p><p>          at org.jbpm.process.instance.event.DefaultSignalManager$SignalAction.execute(DefaultSignalManager.java:175)</p><p>          at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:998)</p></div>
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