[jBPM] - Unable to get Session Snapshot

abadr [https://community.jboss.org/people/abadr] created the discussion

"Unable to get Session Snapshot"

To view the discussion, visit: https://community.jboss.org/message/828386#828386

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Hi,

I am new to JBPM and I am trying to build a stateful workflow process (stateless is working just fine) with two Email Tasks and one signal event (see attached file that includes the Java file and the bpmn file. When I try to start the process and when it reaches the wait state and try to save the current session, I get the following exceptions thrown (I tried to google this problem but with no success so far):

0    17/07 12:42:06,152[main] ERROR drools.persistence.SingleSessionCommandService.rollbackTransaction  - Could not commit session
java.lang.RuntimeException: Unable to commit transaction
     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:182)
     at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:376)
     at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcessInstance(CommandBasedStatefulKnowledgeSession.java:237)
     at com.sample.UploadDocumentWorkflowProcessMain.main(UploadDocumentWorkflowProcessMain.java:79)
Caused by: javax.persistence.PersistenceException: java.lang.RuntimeException: Unable to get session snapshot
     at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:516)
     at bitronix.tm.BitronixTransaction.fireBeforeCompletionEvent(BitronixTransaction.java:478)
     at bitronix.tm.BitronixTransaction.commit(BitronixTransaction.java:193)
     at bitronix.tm.BitronixTransactionManager.commit(BitronixTransactionManager.java:120)
     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179)
     ... 3 more
Caused by: java.lang.RuntimeException: Unable to get session snapshot
     at org.drools.persistence.SessionMarshallingHelper.getSnapshot(SessionMarshallingHelper.java:75)
     at org.drools.persistence.info.SessionInfo.update(SessionInfo.java:85)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:606)
     at org.hibernate.ejb.event.BeanCallback.invoke(BeanCallback.java:23)
     at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:80)
     at org.hibernate.ejb.event.EntityCallbackHandler.preUpdate(EntityCallbackHandler.java:65)
     at org.hibernate.ejb.event.EJB3FlushEntityEventListener.invokeInterceptor(EJB3FlushEntityEventListener.java:41)
     at org.hibernate.event.def.DefaultFlushEntityEventListener.handleInterception(DefaultFlushEntityEventListener.java:330)
     at org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:270)
     at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:151)
     at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
     at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
     at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:49)
     at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
     at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)
     at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504)
     ... 7 more
Caused by: java.io.NotSerializableException: org.drools.impl.StatefulKnowledgeSessionImpl
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181)
     at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1541)
     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1506)
     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
     at java.util.ArrayList.writeObject(ArrayList.java:710)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:606)
     at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
     at org.drools.marshalling.impl.SerializablePlaceholderResolverStrategy$SerializablePlaceholderStrategyContext.write(SerializablePlaceholderResolverStrategy.java:97)
     at org.drools.marshalling.impl.PersisterHelper.writeStrategiesIndex(PersisterHelper.java:209)
     at org.drools.marshalling.impl.PersisterHelper.writeToStreamWithHeader(PersisterHelper.java:189)
     at org.drools.marshalling.impl.ProtobufOutputMarshaller.writeSession(ProtobufOutputMarshaller.java:101)
     at org.drools.marshalling.impl.ProtobufMarshaller.marshall(ProtobufMarshaller.java:169)
     at org.drools.marshalling.impl.ProtobufMarshaller.marshall(ProtobufMarshaller.java:151)
     at org.drools.persistence.SessionMarshallingHelper.getSnapshot(SessionMarshallingHelper.java:72)
     ... 25 more
java.lang.RuntimeException: Unable to commit transaction
     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:182)
     at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:376)
     at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcessInstance(CommandBasedStatefulKnowledgeSession.java:237)
     at com.sample.UploadDocumentWorkflowProcessMain.main(UploadDocumentWorkflowProcessMain.java:79)
Caused by: javax.persistence.PersistenceException: java.lang.RuntimeException: Unable to get session snapshot
     at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:516)
     at bitronix.tm.BitronixTransaction.fireBeforeCompletionEvent(BitronixTransaction.java:478)
     at bitronix.tm.BitronixTransaction.commit(BitronixTransaction.java:193)
     at bitronix.tm.BitronixTransactionManager.commit(BitronixTransactionManager.java:120)
     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179)
     ... 3 more

My Persistence.xml is as follows:
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