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Unable to get Session Snapshot
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created by <a href="https://community.jboss.org/people/abadr">abadr</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/828386#828386">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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):</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>0    17/07 12:42:06,152[main] ERROR drools.persistence.SingleSessionCommandService.rollbackTransaction  - Could not commit session</p><p>java.lang.RuntimeException: Unable to commit transaction</p><p>     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:182)</p><p>     at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:376)</p><p>     at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcessInstance(CommandBasedStatefulKnowledgeSession.java:237)</p><p>     at com.sample.UploadDocumentWorkflowProcessMain.main(UploadDocumentWorkflowProcessMain.java:79)</p><p>Caused by: javax.persistence.PersistenceException: java.lang.RuntimeException: Unable to get session snapshot</p><p>     at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:516)</p><p>     at bitronix.tm.BitronixTransaction.fireBeforeCompletionEvent(BitronixTransaction.java:478)</p><p>     at bitronix.tm.BitronixTransaction.commit(BitronixTransaction.java:193)</p><p>     at bitronix.tm.BitronixTransactionManager.commit(BitronixTransactionManager.java:120)</p><p>     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179)</p><p>     ... 3 more</p><p>Caused by: java.lang.RuntimeException: Unable to get session snapshot</p><p>     at org.drools.persistence.SessionMarshallingHelper.getSnapshot(SessionMarshallingHelper.java:75)</p><p>     at org.drools.persistence.info.SessionInfo.update(SessionInfo.java:85)</p><p>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)</p><p>     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)</p><p>     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)</p><p>     at java.lang.reflect.Method.invoke(Method.java:606)</p><p>     at org.hibernate.ejb.event.BeanCallback.invoke(BeanCallback.java:23)</p><p>     at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:80)</p><p>     at org.hibernate.ejb.event.EntityCallbackHandler.preUpdate(EntityCallbackHandler.java:65)</p><p>     at org.hibernate.ejb.event.EJB3FlushEntityEventListener.invokeInterceptor(EJB3FlushEntityEventListener.java:41)</p><p>     at org.hibernate.event.def.DefaultFlushEntityEventListener.handleInterception(DefaultFlushEntityEventListener.java:330)</p><p>     at org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:270)</p><p>     at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:151)</p><p>     at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)</p><p>     at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)</p><p>     at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:49)</p><p>     at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)</p><p>     at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)</p><p>     at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504)</p><p>     ... 7 more</p><p>Caused by: java.io.NotSerializableException: org.drools.impl.StatefulKnowledgeSessionImpl</p><p>     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181)</p><p>     at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1541)</p><p>     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1506)</p><p>     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)</p><p>     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)</p><p>     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)</p><p>     at java.util.ArrayList.writeObject(ArrayList.java:710)</p><p>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)</p><p>     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)</p><p>     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)</p><p>     at java.lang.reflect.Method.invoke(Method.java:606)</p><p>     at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)</p><p>     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)</p><p>     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)</p><p>     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)</p><p>     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)</p><p>     at org.drools.marshalling.impl.SerializablePlaceholderResolverStrategy$SerializablePlaceholderStrategyContext.write(SerializablePlaceholderResolverStrategy.java:97)</p><p>     at org.drools.marshalling.impl.PersisterHelper.writeStrategiesIndex(PersisterHelper.java:209)</p><p>     at org.drools.marshalling.impl.PersisterHelper.writeToStreamWithHeader(PersisterHelper.java:189)</p><p>     at org.drools.marshalling.impl.ProtobufOutputMarshaller.writeSession(ProtobufOutputMarshaller.java:101)</p><p>     at org.drools.marshalling.impl.ProtobufMarshaller.marshall(ProtobufMarshaller.java:169)</p><p>     at org.drools.marshalling.impl.ProtobufMarshaller.marshall(ProtobufMarshaller.java:151)</p><p>     at org.drools.persistence.SessionMarshallingHelper.getSnapshot(SessionMarshallingHelper.java:72)</p><p>     ... 25 more</p><p>java.lang.RuntimeException: Unable to commit transaction</p><p>     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:182)</p><p>     at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:376)</p><p>     at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcessInstance(CommandBasedStatefulKnowledgeSession.java:237)</p><p>     at com.sample.UploadDocumentWorkflowProcessMain.main(UploadDocumentWorkflowProcessMain.java:79)</p><p>Caused by: javax.persistence.PersistenceException: java.lang.RuntimeException: Unable to get session snapshot</p><p>     at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:516)</p><p>     at bitronix.tm.BitronixTransaction.fireBeforeCompletionEvent(BitronixTransaction.java:478)</p><p>     at bitronix.tm.BitronixTransaction.commit(BitronixTransaction.java:193)</p><p>     at bitronix.tm.BitronixTransactionManager.commit(BitronixTransactionManager.java:120)</p><p>     at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179)</p><p>     ... 3 more</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My Persistence.xml is as follows:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p></div>
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