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 -------------------------------------------------------------- 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@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. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/617763#617763] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]