[jboss-user] [jBPM] - jBPM 4.3, multiple threads handled sub-process caused its parent process throwing exceptions

[Tun Mang]

Tun Mang [http://community.jboss.org/people/tunmang] created the discussion

"jBPM 4.3, multiple threads handled sub-process caused its parent process throwing exceptions"

To view the discussion, visit: http://community.jboss.org/message/617763#617763

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Hi :

I have a jpdl with fork as shown below :

  -->(fork-node)-->(sub-process-node-A)-->(join-node)
                -->(sub-process-node-B)-->

The sub-process-node-A and sub-process-node-B refer a same and very simple sub-process jpdl (which has only 3 nodes: start, state and end). But there is one thread to call the signal process function per sub-process (i.e. there are totally 2 threads running to handle the externl jobs).

When the thread calls the signal process function to end its corresponding sub-process, it's all OK:

....          
21:50:36 DEBUG [....EndHandler]: (AP) parent process: (PVODDelivery.2660001)
21:50:36 DEBUG [....EndHandler]: (AP)   execution id: (ConformAsset.2660164)
....
21:50:36 DEBUG [....EndHandler]: (AP) parent process: (PVODDelivery.2660001)
21:50:36 DEBUG [....EndHandler]: (AP)   execution id: (ConformAsset.2660078)
....

But right after the ending of the sub-process, jbpm always throws the following exceptions:

21:50:37,164 INF | [DefaultCommandService] exception while executing command org.jbpm.pvm.internal.cmd.SignalCmd at 64f06ab7
org.hibernate.StaleObjectStateException: 
Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.jbpm.pvm.internal.model.ExecutionImpl#2660001]
          at org.hibernate.dialect.lock.SelectLockingStrategy.lock(SelectLockingStrategy.java:102)
          at org.hibernate.persister.entity.AbstractEntityPersister.lock(AbstractEntityPersister.java:1361)
          at org.hibernate.event.def.AbstractLockUpgradeEventListener.upgradeLock(AbstractLockUpgradeEventListener.java:108)
          at org.hibernate.event.def.DefaultLockEventListener.onLock(DefaultLockEventListener.java:87)
          at org.hibernate.impl.SessionImpl.fireLock(SessionImpl.java:611)
          at org.hibernate.impl.SessionImpl.lock(SessionImpl.java:603)
          at org.jbpm.jpdl.internal.activity.JoinActivity.execute(JoinActivity.java:68)
          at org.jbpm.jpdl.internal.activity.JoinActivity.execute(JoinActivity.java:49)
          at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60)
          at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:678)
          at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:638)
          at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:439)
          at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:421)
    ....

Is there a way to fix this issue via "jbpm.default.cfg.xml" or "jbpm.hibernate.cfg.xml" ?

Thanks a lot for you time and help in advance.
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