Carlo Carrara [https://community.jboss.org/people/carlo.carrara] created the discussion "Drools - unable to commit after fireRules with retract" To view the discussion, visit: https://community.jboss.org/message/736997#736997 -------------------------------------------------------------- I’m using drools 5.4.0.Final & JPA on JBossAS 7.1.1 and MySQL 5 with attached rules file. All things go fine if I add facts in entry points "startVM" or "destroyVM" (related rules has “retract” instruction commented), but things go wrong when I add facts in entry points "createVM" or "stopVM" (related rules has “retract” instruction active). The events sequence is this: 1. Startup application with clean db 2. Execute fireRules 3. Add some facts in entry points "startVM" or "destroyVM" (related rules has “retract” instruction commented) 4. Execute fireRules 5. Stop application 6. Restart application, reloading some facts from db 7. Add a fact in entry point "createVM" or "stopVM" (related rules has “retract” instruction active) 8. Execute fireRules 9. Stop application 10. Restart application, reloading some facts from db 11. Execute fireRules: error thrown! I can do anything before step 7 in any combination, and everything goes fine. The problem is created by step 7. Here the exception  thrown: Every “add a fact” step and “execute fireRules” step is under transaction. 2012-05-21 19:46:06.441 | fireRules1 |  |  |  | ERROR | com.abc.eventprocessor.rule.drools.DroolsRuleEngine | fireRules | error firing rules         javax.transaction.RollbackException: ARJUNA016053: Could not commit transaction.         at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1177) ~[na:na]         at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:117) ~[na:na]         at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75) ~[na:na]         at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:167) ~[na:na]         at com.abc.eventprocessor.rule.drools.DroolsRuleEngine.fireRules(DroolsRuleEngine.java:169) ~[classes:1.0.0-SNAPSHOT]         at com.abc.eventprocessor.scheduler.FireRulesJobDetail.executeInternal(FireRulesJobDetail.java:35) [classes:1.0.0-SNAPSHOT]         at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:113) [spring-context-support-3.1.1.RELEASE.jar:3.1.1.RELEASE]         at com.abc.commons.quartz.ClusterizableJobMap.executeInternal(ClusterizableJobMap.java:28) [commons-1.0.3-SNAPSHOT.jar:1.0.3-SNAPSHOT]         at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:113) [spring-context-support-3.1.1.RELEASE.jar:3.1.1.RELEASE]         at org.quartz.core.JobRunShell.run(JobRunShell.java:216) [quartz-1.8.4.jar:na]         at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549) [quartz-1.8.4.jar:na] Caused by: javax.persistence.PersistenceException: error during managed flush         at org.hibernate.ejb.AbstractEntityManagerImpl$CallbackExceptionMapperImpl.mapManagedFlushFailure(AbstractEntityManagerImpl.java:1486) ~[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) ~[na:na]         at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:273) ~[na:na]         at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:93) ~[na:na]         at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:164) ~[na:na]         at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1165) ~[na:na]         ... 10 common frames omitted Caused by: java.lang.NullPointerException: null         at org.drools.reteoo.ObjectTypeNode$ExpireJobContextTimerOutputMarshaller.serialize(ObjectTypeNode.java:668) ~[drools-core-5.4.0.Final.jar:5.4.0.Final]         at org.drools.marshalling.impl.ProtobufOutputMarshaller.writeTimers(ProtobufOutputMarshaller.java:691) ~[drools-core-5.4.0.Final.jar:5.4.0.Final]         at org.drools.marshalling.impl.ProtobufOutputMarshaller.serializeSession(ProtobufOutputMarshaller.java:176) ~[drools-core-5.4.0.Final.jar:5.4.0.Final]         at org.drools.marshalling.impl.ProtobufOutputMarshaller.writeSession(ProtobufOutputMarshaller.java:100) ~[drools-core-5.4.0.Final.jar:5.4.0.Final]         at org.drools.marshalling.impl.ProtobufMarshaller.marshall(ProtobufMarshaller.java:169) ~[drools-core-5.4.0.Final.jar:5.4.0.Final]         at org.drools.marshalling.impl.ProtobufMarshaller.marshall(ProtobufMarshaller.java:151) ~[drools-core-5.4.0.Final.jar:5.4.0.Final]         at org.drools.persistence.SessionMarshallingHelper.getSnapshot(SessionMarshallingHelper.java:72) ~[drools-persistence-jpa-5.4.0.Final.jar:5.4.0.Final]         at org.drools.persistence.info.SessionInfo.update(SessionInfo.java:85) ~[drools-persistence-jpa-5.4.0.Final.jar:5.4.0.Final]         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0]         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[na:1.6.0]         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0]         at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0]         at org.hibernate.ejb.event.BeanCallback.invoke(BeanCallback.java:39) ~[hibernate-entitymanager-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.ejb.event.EntityCallbackHandler.callback(EntityCallbackHandler.java:110) ~[hibernate-entitymanager-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.ejb.event.EntityCallbackHandler.preUpdate(EntityCallbackHandler.java:95) ~[hibernate-entitymanager-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.ejb.event.EJB3FlushEntityEventListener.invokeInterceptor(EJB3FlushEntityEventListener.java:65) ~[hibernate-entitymanager-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.event.internal.DefaultFlushEntityEventListener.handleInterception(DefaultFlushEntityEventListener.java:315) ~[hibernate-core-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.event.internal.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:266) ~[hibernate-core-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:149) ~[hibernate-core-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:225) ~[hibernate-core-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99) ~[hibernate-core-4.0.1.Final.jar!/:4.0.1.Final]         at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51) ~[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]         ... 16 common frames omitted After this error I need to clean the db and loose session data. 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