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Unable to complete a task when running the task in a separate thread
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created by <a href="http://community.jboss.org/people/connie.yang">Connie Yang</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/612824#612824">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a WorkItemHandler that can run the service task either in the main thread or in a separate thread.  This is my way of handling for-each parallel (aka fanout).  When the service task is run in a separate thread, I have been experiencing a NullPointerException with the following stack trace upon marking the task completed (via NodeInstanceImpl.triggerCompleted).  What am I missing?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><ol style="font-size: 12px; list-style-type: lower-alpha; list-style-position: initial; list-style-image: initial; padding-left: 2.25em;"><li><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">java.lang.NullPointerException</span></li></ol><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.process.instance.impl.ProcessInstanceImpl.getProcess(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">ProcessInstanceImpl.java:67</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.getWorkflowProcess(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">WorkflowProcessInstanceImpl.java:180</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.getNodeContainer(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">WorkflowProcessInstanceImpl.java:68</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.getNode(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">NodeInstanceImpl.java:100</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.node.ActionNodeInstance.getActionNode(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">ActionNodeInstance.java:35</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.node.ActionNodeInstance.internalTrigger(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">ActionNodeInstance.java:43</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">NodeInstanceImpl.java:122</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">NodeInstanceImpl.java:185</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">NodeInstanceImpl.java:150</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">ExtendedNodeInstanceImpl.java:47</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">StateBasedNodeInstance.java:162</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">StateBasedNodeInstance.java:143</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">WorkItemNodeInstance.java:239</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">WorkItemNodeInstance.java:301</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">WorkItemNodeInstance.java:277</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">WorkflowProcessInstanceImpl.java:333</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">JPAWorkItemManager.java:117</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at com.ebay.cloud.orchest.jbpm.LcmPojoWorkItemHandler$1.run(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">LcmPojoWorkItemHandler.java:95</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">      at com.ebay.kernel.executor.TaskExecutor$Adapter.call(</span><span style="font-size: 10pt; color: navy; text-decoration: underline; font-family: 'Courier New';">TaskExecutor.java:587</span><span style="font-size: 10pt; font-family: 'Courier New'; color: red;">)</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks in advance!</p><p>Connie</p></div>
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