jbpm 5.4.0 - NullPointerException completing workItem when using Spring local transactions and shared entity manager.

[xmithj]

I decided to give it a try to Spring local transactions and shared entity manager, so I changed my configuration as per user guide v5.4.

I tested with a fairly simple business process with an asynchronous workItem that get completed after certain amount of time by a different thread.

Everything went well until the scheduled timer tried to complete the workItem by calling:

     ksession.getWorkItemManager().completeWorkItem(workItemId, resultMap);

By executing this line, I am getting this exception:

2013-01-10 15:13:46,234 ERROR  [Timer-0] SingleSessionCommandService M[rollbackTransaction] --> Could not commit session

java.lang.NullPointerException

    at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:306)

    at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:285)

    at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:342)

    at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:121)

    at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:69)

    at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:32)

    at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)

    at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:373)

    at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150)

The passed workItemId is correct (the expected one).

The same test runs successfully when configuring for JTA transaction management. Should I create a Jira issue for this?

Regards,

John

[swiderski.maciej]

could you provide your spring configuration? Or even better a test case

it looks like the work item cannot be found in the data base...

Cheers

[xmithj]

Thanks Maciej,

I think you will agree that if the workItem cannot be found in DB one would expect a different error rather than a misleading NullPointerException.

I believe this itself should be considered a bug. What's your view on this?

Regards,

J

[swiderski.maciej]

if it is not a result of misconfiguration I would completely agree. Anyway, if you have a reproducible test for it please file a jira issue so we could work on it.

Cheers

[dakshesh.patel]

Hi Maciej

I am getting same issue mentioned above when using jbpm 5.4 with JPA-2 using jpa transaction management while completing work item.

Logger :

select workitemin0_.workItemId as workItemId2_0_, workitemin0_.creationDate as creation2_2_0_, workitemin0_.name as name2_0_, workitemin0_.processInstanceId as processI4_2_0_, workitemin0_.state as state2_0_, workitemin0_.OPTLOCK as OPTLOCK2_0_, workitemin0_.workItemByteArray as workItem7_2_0_ from WorkItemInfo workitemin0_ where workitemin0_.workItemId=?

binding parameter [1] as [BIGINT] - 154

Found [2013-11-27 19:16:22.867] as column [creation2_2_0_]

Found [Human Task] as column [name2_0_]

Found [7] as column [processI4_2_0_]

Found [0] as column [state2_0_]

Found [1] as column [OPTLOCK2_0_]

Found [[B@1f937c1] as column [workItem7_2_0_]

SingleSessionCommandService -Could not commit session

java.lang.NullPointerException

    at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:306)[jbpm-flow-5.4.0.Final.jar:5.4.0.Final]

    at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:285)[jbpm-flow-5.4.0.Final.jar:5.4.0.Final]

    at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:342)[jbpm-flow-5.4.0.Final.jar:5.4.0.Final]

    at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:121)[drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]

    at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:69)[drools-core-5.5.0.Final.jar:5.5.0.Final]

    at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:32)[drools-core-5.5.0.Final.jar:5.5.0.Final]

    at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)[drools-core-5.5.0.Final.jar:5.5.0.Final]

    at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:373)[drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]

    at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150)[drools-core-5.5.0.Final.jar:5.5.0.Final]

    at com.tcs.city.service.impl.JBPMServiceImpl.finishJBPMEvent(JBPMServiceImpl.java:513)[JBPMServiceImpl.class:]

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.7.0_25]

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[:1.7.0_25]

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.7.0_25]

    at java.lang.reflect.Method.invoke(Method.java:606)[:1.7.0_25]

You can see workitem id is there in the database.

Kindly provide your inputs on this.

Should i move to JTA instead of JPA to resolve this issue as mentioned by j Xmith?

[lijiangt]

I use Spring local transactions and shared entity manager. I have the same problem. When single user operates everythings ok, but multiple user operates occasionally throws exception like below:

java.lang.NullPointerException

  at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:306)

  at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:285)

  at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:342)

  at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:121)

  at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:69)

  at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:32)

  at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)

  at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:373)

  at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150)

java.lang.NullPointerException

  at org.jbpm.process.instance.impl.ProcessInstanceImpl.getProcess(ProcessInstanceImpl.java:68)

  at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.getWorkflowProcess(WorkflowProcessInstanceImpl.java:181)

  at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.getNodeContainer(WorkflowProcessInstanceImpl.java:69)

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.getNode(NodeInstanceImpl.java:103)

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.getNodeName(NodeInstanceImpl.java:79)

  at org.jbpm.workflow.instance.WorkflowRuntimeException.<init>(WorkflowRuntimeException.java:33)

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:132)

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:279)

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:238)

  at org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:47)

  at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:216)

  at org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:196)

  at org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:247)

  at org.jbpm.workflow.instance.node.HumanTaskNodeInstance.triggerCompleted(HumanTaskNodeInstance.java:90)

  at org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:309)

  at org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:285)

  at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:342)