Gareth Edwards [https://community.jboss.org/people/garethed] created the discussion "JTA Problem with multiple sessions" To view the discussion, visit: https://community.jboss.org/message/795428#795428 -------------------------------------------------------------- Hello. I am writing a system which will allow my to start instances of work-flows using a rest api as well as managing all the human tasks. For now I am using one instance of a KnowlegeBase which uses an EntityManagerFactory like this: if (emf == null){ emf = Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" );                               Environment env = KnowledgeBaseFactory.newEnvironment();                               env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );                     } I am using a Stateful knowledge session per work-flow instance. JPAWorkingMemoryDbLogger logger = new JPAWorkingMemoryDbLogger(ksession);                   String connectorName = "Hornet" + UUID.randomUUID().toString();                   AsyncHornetQHTWorkItemHandler workItemHandler = new AsyncHornetQHTWorkItemHandler(new AsyncHornetQTaskClient(connectorName), ksession, OnErrorAction.LOG);                   workItemHandler.setIpAddress("192.168.1.90"); ksession.getWorkItemManager().registerWorkItemHandler("Human Task", workItemHandler); ksession.startProcess(workflowSession.getWorkflowName(),workflowSession.getWorkFlowData()); try {                                         Thread.sleep(2000);                               } catch (InterruptedException e) {   // TODO Auto-generated catch block                                         e.printStackTrace();                               } With a clean postgres database the first completion of the human task (and end of the work-flow) I get no problems: 15:12:54,302 INFO  [stdout] (workflowExecutor-1) Workflow Instance Variables 15:12:54,303 INFO  [stdout] (workflowExecutor-1) agent:krisv 15:12:54,305 INFO  [stdout] (workflowExecutor-1) test_id:TZ001A0001 15:13:56,128 INFO  [stdout] (Thread-76) test_id is correct 15:13:56,128 INFO  [stdout] (Thread-76) test_id:TZ001A0001 15:13:56,128 INFO  [stdout] (Thread-76) submitted_test_id:TZ001A0001 But then running the work-flow again (new session) I almost always get problems: 15:14:33,869 INFO  [stdout] (workflowExecutor-2) Workflow Instance Variables 15:14:33,870 INFO  [stdout] (workflowExecutor-2) agent:krisv 15:14:33,870 INFO  [stdout] (workflowExecutor-2) test_id:TZ001A0001 15:14:54,675 INFO  [stdout] (Thread-76) test_id is correct 15:14:54,675 INFO  [stdout] (Thread-76) test_id:TZ001A0001 15:14:54,675 INFO  [stdout] (Thread-76) submitted_test_id:TZ001A0001 15:14:54,692 INFO  [stdout] (Thread-77) test_id is correct 15:14:54,692 INFO  [stdout] (Thread-77) test_id:TZ001A0001 15:14:54,693 INFO  [stdout] (Thread-77) submitted_test_id:TZ001A0001 15:14:54,719 WARN  [com.arjuna.ats.arjuna] (Thread-77) ARJUNA012125: TwoPhaseCoordinator.beforeCompletion - failed for SynchronizationImple< 0:ffff7f000101:-62cc4985:510a8991:60, org.hibernate.engine.transaction.synchronization.internal.RegisteredSynchronization@339ec220 >: javax.persistence.OptimisticLockException: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.jbpm.persistence.processinstance.ProcessInstanceInfo#11]           at org.hibernate.ejb.AbstractEntityManagerImpl.wrapStaleStateException(AbstractEntityManagerImpl.java:1394) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1308) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl$CallbackExceptionMapperImpl.mapManagedFlushFailure(AbstractEntityManagerImpl.java:1481) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.beforeCompletion(SynchronizationCallbackCoordinatorImpl.java:109) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.RegisteredSynchronization.beforeCompletion(RegisteredSynchronization.java:53) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:76)           at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:273)           at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:93)           at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:164)           at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1165)           at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:117)           at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75)           at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:167)           at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:376) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150) [drools-core-5.5.0.Final.jar:5.5.0.Final]           at org.jbpm.process.workitem.wsht.AsyncGenericHTWorkItemHandler$GetResultContentResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:302) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:153) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientHandler.messageReceived(HornetQTaskClientHandler.java:56) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:122) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at java.lang.Thread.run(Thread.java:636) [rt.jar:1.6.0_18] Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.jbpm.persistence.processinstance.ProcessInstanceInfo#11]           at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2359) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3127) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3327) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.action.internal.EntityDeleteAction.execute(EntityDeleteAction.java:91) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:272) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:264) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:191) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1081) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:315) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.beforeCompletion(SynchronizationCallbackCoordinatorImpl.java:104) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           ... 17 more 15:14:54,732 WARN  [org.drools.persistence.jta.JtaTransactionManager] (Thread-77) Unable to commit transaction: javax.transaction.RollbackException: ARJUNA016053: Could not commit transaction.           at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1177)           at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:117)           at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75)           at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:167)           at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:376) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150) [drools-core-5.5.0.Final.jar:5.5.0.Final]           at org.jbpm.process.workitem.wsht.AsyncGenericHTWorkItemHandler$GetResultContentResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:302) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:153) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientHandler.messageReceived(HornetQTaskClientHandler.java:56) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:122) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at java.lang.Thread.run(Thread.java:636) [rt.jar:1.6.0_18] Caused by: javax.persistence.OptimisticLockException: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.jbpm.persistence.processinstance.ProcessInstanceInfo#11]           at org.hibernate.ejb.AbstractEntityManagerImpl.wrapStaleStateException(AbstractEntityManagerImpl.java:1394) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1308) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl$CallbackExceptionMapperImpl.mapManagedFlushFailure(AbstractEntityManagerImpl.java:1481) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.beforeCompletion(SynchronizationCallbackCoordinatorImpl.java:109) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.RegisteredSynchronization.beforeCompletion(RegisteredSynchronization.java:53) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:76)           at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:273)           at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:93)           at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:164)           at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1165)           ... 11 more Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.jbpm.persistence.processinstance.ProcessInstanceInfo#11]           at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2359) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3127) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3327) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.action.internal.EntityDeleteAction.execute(EntityDeleteAction.java:91) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:272) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:264) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:191) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1081) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:315) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.beforeCompletion(SynchronizationCallbackCoordinatorImpl.java:104) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           ... 17 more 15:14:54,737 ERROR [org.drools.persistence.SingleSessionCommandService] (Thread-77) Could not commit session: java.lang.RuntimeException: Unable to commit transaction           at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:182) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:376) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150) [drools-core-5.5.0.Final.jar:5.5.0.Final]           at org.jbpm.process.workitem.wsht.AsyncGenericHTWorkItemHandler$GetResultContentResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:302) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:153) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientHandler.messageReceived(HornetQTaskClientHandler.java:56) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:122) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at java.lang.Thread.run(Thread.java:636) [rt.jar:1.6.0_18] Caused by: javax.transaction.RollbackException: ARJUNA016053: Could not commit transaction.           at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1177)           at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:117)           at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75)           at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:167)           at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           ... 7 more Caused by: javax.persistence.OptimisticLockException: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.jbpm.persistence.processinstance.ProcessInstanceInfo#11]           at org.hibernate.ejb.AbstractEntityManagerImpl.wrapStaleStateException(AbstractEntityManagerImpl.java:1394) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1308) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.ejb.AbstractEntityManagerImpl$CallbackExceptionMapperImpl.mapManagedFlushFailure(AbstractEntityManagerImpl.java:1481) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.beforeCompletion(SynchronizationCallbackCoordinatorImpl.java:109) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.RegisteredSynchronization.beforeCompletion(RegisteredSynchronization.java:53) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:76)           at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:273)           at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:93)           at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:164)           at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1165)           ... 11 more Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.jbpm.persistence.processinstance.ProcessInstanceInfo#11]           at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:2359) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3127) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3327) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.action.internal.EntityDeleteAction.execute(EntityDeleteAction.java:91) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:272) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:264) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:191) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1081) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:315) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           at org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorImpl.beforeCompletion(SynchronizationCallbackCoordinatorImpl.java:104) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]           ... 17 more 15:14:54,748 WARN  [org.drools.persistence.jta.JtaTransactionManager] (Thread-77) Unable to rollback transaction: java.lang.IllegalStateException: BaseTransaction.rollback - ARJUNA016074: no transaction!           at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.rollback(BaseTransaction.java:130)           at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.rollback(BaseTransactionManagerDelegate.java:114)           at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.rollback(ServerVMClientUserTransaction.java:175)           at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:191) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.persistence.SingleSessionCommandService.rollbackTransaction(SingleSessionCommandService.java:402) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:381) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150) [drools-core-5.5.0.Final.jar:5.5.0.Final]           at org.jbpm.process.workitem.wsht.AsyncGenericHTWorkItemHandler$GetResultContentResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:302) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:153) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientHandler.messageReceived(HornetQTaskClientHandler.java:56) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:122) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at java.lang.Thread.run(Thread.java:636) [rt.jar:1.6.0_18] 15:14:54,751 ERROR [org.drools.persistence.SingleSessionCommandService] (Thread-77) Could not rollback: java.lang.RuntimeException: Unable to rollback transaction           at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:197) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.persistence.SingleSessionCommandService.rollbackTransaction(SingleSessionCommandService.java:402) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:381) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]           at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150) [drools-core-5.5.0.Final.jar:5.5.0.Final]           at org.jbpm.process.workitem.wsht.AsyncGenericHTWorkItemHandler$GetResultContentResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:302) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:153) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientHandler.messageReceived(HornetQTaskClientHandler.java:56) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:122) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final]           at java.lang.Thread.run(Thread.java:636) [rt.jar:1.6.0_18] Caused by: java.lang.IllegalStateException: BaseTransaction.rollback - ARJUNA016074: no transaction!           at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.rollback(BaseTransaction.java:130) | | at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.rollback(BaseTransactionManagerDelegate.java:114) | | | at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.rollback(ServerVMClientUserTransaction.java:175) | | | at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:191) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final] | | | ... 8 more | 15:14:54,754 ERROR [org.jbpm.task.service.hornetq.HornetQTaskClientConnector] (Thread-77) Client Exception with class class org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1 using port 5153: java.lang.RuntimeException: Could not commit session or rollback | | at org.drools.persistence.SingleSessionCommandService.rollbackTransaction(SingleSessionCommandService.java:406) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final] | | | at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:381) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final] | | | at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150) [drools-core-5.5.0.Final.jar:5.5.0.Final] | | | at org.jbpm.process.workitem.wsht.AsyncGenericHTWorkItemHandler$GetResultContentResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:302) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final] | | | at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:153) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final] | | | at org.jbpm.task.service.hornetq.HornetQTaskClientHandler.messageReceived(HornetQTaskClientHandler.java:56) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final] | | | at org.jbpm.task.service.hornetq.HornetQTaskClientConnector$1.run(HornetQTaskClientConnector.java:122) [jbpm-human-task-hornetq-5.4.0.Final.jar:5.4.0.Final] | | | at java.lang.Thread.run(Thread.java:636) [rt.jar:1.6.0_18] | Caused by: java.lang.RuntimeException: Unable to rollback transaction | | at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:197) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final] | | | at org.drools.persistence.SingleSessionCommandService.rollbackTransaction(SingleSessionCommandService.java:402) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final] | | | ... 7 more | Caused by: java.lang.IllegalStateException: BaseTransaction.rollback - ARJUNA016074: no transaction! | | at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.rollback(BaseTransaction.java:130) | | | at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.rollback(BaseTransactionManagerDelegate.java:114) | | | at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.rollback(ServerVMClientUserTransaction.java:175) | | | at org.drools.persistence.jta.JtaTransactionManager.rollback(JtaTransactionManager.java:191) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final] | | | ... 8 more | I'm using the bundled human-task-war.war application to handle human tasks. The persistence for my EntityManagerFactory is configured using the following persistence.xml <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <persistence version="2.0"   xmlns=" http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="         http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence         http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">   <persistence-unit name="org.jbpm.persistence.jpa"   transaction-type="JTA"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <jta-data-source>java:jboss/datasources/jbpmDS</jta-data-source> <mapping-file>META-INF/JBPMorm-JPA2.xml</mapping-file> <mapping-file>META-INF/ProcessInstanceInfoMapping-JPA2.xml</mapping-file> <class>org.drools.persistence.info.SessionInfo</class> <class>org.drools.persistence.info.WorkItemInfo</class> <class>org.jbpm.process.audit.ProcessInstanceLog</class> <class>org.jbpm.process.audit.NodeInstanceLog</class> <class>org.jbpm.process.audit.VariableInstanceLog</class>   <properties>   <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />   <property name="hibernate.max_fetch_depth" value="3" />   <!-- property name="hibernate.hbm2ddl.auto" value="update" /-->   <property name="hibernate.show_sql" value="false" />   <!--property name="hibernate.transaction.manager_lookup_class"                                         value="org.hibernate.transaction.JBossTransactionManagerLookup" /-->   <property name="hibernate.transaction.jta.platform"   value="org.hibernate.service.jta.platform.internal.JBossAppServerJtaPlatform" />   <!-- BZ 841786: AS7/EAP 6/Hib 4 uses new (sequence) generators which seem                                         to cause problems -->   <property name="hibernate.id.new_generator_mappings" value="false" />   </properties>   </persistence-unit> </persistence> I tried the change below as it was suggested by another user with similar problems with Postgres   <!--property name="hibernate.transaction.manager_lookup_class"   value="org.hibernate.transaction.JBossTransactionManagerLookup" /-->   <property name="hibernate.transaction.jta.platform"   value="org.hibernate.service.jta.platform.internal.JBossAppServerJtaPlatform" /> But that didn't seem to help. I hope somebody can help Thanks in advance, Gareth. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/795428#795428] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]