[jboss-user] [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 -------------------------------------------------------------- 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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