Esteban thanks for your reply. No we're not using timers at all. Thanks for the advice on the correct list :) Darren From: rules-dev-bounces(a)lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Esteban Aliverti Sent: 24 November 2010 11:55 To: Rules Dev List Subject: Re: [rules-dev] Cannot synchronize database state with session Just wondering, does your process has timers? By the way you should post this kind of emails in rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org> Best Regards, XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Esteban Aliverti - Developer @ http://www.plugtree.com - Blog @ http://ilesteban.wordpress.com On Tue, Nov 23, 2010 at 2:13 PM, <darren.kay@bt.com<mailto:darren.kay@bt.com>> wrote: Drools Version: 5.1.0 JBoss Version: 5.1.0 GA (Clustered) We're using a clustered JBoss setup (with 2 nodes) with Drools and getting an intermitten stale ksession exception - stack trace attached below. We use 'org.drools.persistence.jpa.JPAKnowledgeService' to persist KnowledgeSession to a MySQL database and use Hibernate to manage the transactions. In case of a new request, we create a new Drools Knowledge Session and persist it and store the knowledge session id to our database. StatefulKnowledgeSession session = JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, null, environment); return session; For all subsequent requests we load the Knowledge session from the database using the knowledge session id. StatefulKnowledgeSession session = JPAKnowledgeService.loadStatefulKnowledgeSession(sessionId, knowledgeBase, null, environment); return session; We receive request from the front-end validate the information and update the knowledge session facts using; public void insertOrUpdateSessionFacts(StatefulKnowledgeSession session, Object...objects) { boolean factMatched = false; for (Object obj: objects) { //get all session facts Collection<Object> facts = session.getObjects(); for (Object fact: facts) { if (fact.getClass().toString().equals(obj.getClass().toString())) { //update fact in session session.update(session.getFactHandle(fact), obj); factMatched = true; break; } } if (factMatched) { factMatched = false; } else { //fact not found, so insert new fact session.insert(obj); } } } After the facts are updated we use find the response variable populated from the Drools flow and pass it back to the front-end; //get variable scope context VariableScopeInstance vi = (VariableScopeInstance) processInstance.getContextInstance(VariableScope.VARIABLE_SCOPE); return vi.getVariable(variableName); Any pointers would be much appreciated. Stack Trace is below Darren 2010-11-23 04:40:26,838 INFO [STDOUT] (pool-47-thread-1) Hibernate: select workitemin0_.workItemId as workItemId92_0_, workitemin0_.creationDate as creation2_92_0_, workitemin0_.externalVariables as external3_92_0_, workitemin0_.name as name92_0_, workitemin0_.processInstanceId as processI5_92_0_, workitemin0_.state as state92_0_, workitemin0_.OPTLOCK as OPTLOCK92_0_, workitemin0_.workItemByteArray as workItem8_92_0_ from WorkItemInfo workitemin0_ where workitemin0_.workItemId=? 2010-11-23 04:40:26,841 INFO [STDOUT] (pool-47-thread-1) Hibernate: select variables0_.workItemId as workItemId1_, variables0_.id as id1_, variables0_.name as formula1_1_, variables0_.id as id94_0_, variables0_.name as name94_0_, variables0_.persister as persister94_0_, variables0_.processInstanceId as processI5_94_0_, variables0_.workItemId as workItemId94_0_ from VariableInstanceInfo variables0_ where variables0_.workItemId=? 2010-11-23 04:40:26,857 INFO [STDOUT] (pool-47-thread-1) Hibernate: update ProcessInstanceInfo set externalVariables=?, lastModificationDate=?, lastReadDate=?, processId=?, processInstanceByteArray=?, startDate=?, state=?, OPTLOCK=? where InstanceId=? and OPTLOCK=? 2010-11-23 04:40:26,864 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] (pool-47-thread-1) Could not synchronize database state with session org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.drools.persistence.processinstance.ProcessInstanceInfo#14] at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:1792) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2435) at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635) at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365) at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504) at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:101) at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:269) at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:89) at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177) at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1423) at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:137) at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75) at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:170) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87) at org.jboss.aspects.tx.TxInterceptor$RequiresNew.invoke(TxInterceptor.java:261) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:421) at org.jboss.ejb3.remoting.IsLocalInterceptor.invokeLocal(IsLocalInterceptor.java:85) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:72) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62) at $Proxy608.invoke(Unknown Source) at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207) at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164) at $Proxy607.processKbdRequest(Unknown Source) at net.plus.kbd.faults.gateway.actions.DroolsFlowSender.process(DroolsFlowSender.java:84) at sun.reflect.GeneratedMethodAccessor807.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.soa.esb.listeners.message.ActionProcessorMethodInfo.processMethods(ActionProcessorMethodInfo.java:102) at org.jboss.soa.esb.listeners.message.OverriddenActionLifecycleProcessor.process(OverriddenActionLifecycleProcessor.java:74) at org.jboss.soa.esb.listeners.message.ActionProcessingPipeline.processPipeline(ActionProcessingPipeline.java:649) at org.jboss.soa.esb.listeners.message.ActionProcessingPipeline.processPipeline(ActionProcessingPipeline.java:603) at org.jboss.soa.esb.listeners.message.ActionProcessingPipeline.process(ActionProcessingPipeline.java:433) at org.jboss.soa.esb.listeners.message.MessageAwareListener$TransactionalRunner.run(MessageAwareListener.java:540) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) 2010-11-23 04:40:26,871 WARN [com.arjuna.ats.arjuna.logging.arjLoggerI18N] (pool-47-thread-1) [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_2] TwoPhaseCoordinator.beforeCompletion - failed for com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple@c9c803 javax.persistence.OptimisticLockException: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.drools.persistence.processinstance.ProcessInstanceInfo#14] at org.hibernate.ejb.AbstractEntityManagerImpl.wrapStaleStateException(AbstractEntityManagerImpl.java:630) at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:588) at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:513) at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:101) at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:269) at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:89) at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177) at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1423) at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:137) at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75) at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:170) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87) at org.jboss.aspects.tx.TxInterceptor$RequiresNew.invoke(TxInterceptor.java:261) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.security.Ejb3AuthenticationInterceptorv2.invoke(Ejb3AuthenticationInterceptorv2.java:186) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:41) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.BlockContainerShutdownInterceptor.invoke(BlockContainerShutdownInterceptor.java:67) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.currentinvocation.CurrentInvocationInterceptor.invoke(CurrentInvocationInterceptor.java:67) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:421) at org.jboss.ejb3.remoting.IsLocalInterceptor.invokeLocal(IsLocalInterceptor.java:85) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:72) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102) at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62) at $Proxy608.invoke(Unknown Source) at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207) at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164) at $Proxy607.processKbdRequest(Unknown Source) at net.plus.kbd.faults.gateway.actions.DroolsFlowSender.process(DroolsFlowSender.java:84) at sun.reflect.GeneratedMethodAccessor807.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.soa.esb.listeners.message.ActionProcessorMethodInfo.processMethods(ActionProcessorMethodInfo.java:102) at org.jboss.soa.esb.listeners.message.OverriddenActionLifecycleProcessor.process(OverriddenActionLifecycleProcessor.java:74) at org.jboss.soa.esb.listeners.message.ActionProcessingPipeline.processPipeline(ActionProcessingPipeline.java:649) at org.jboss.soa.esb.listeners.message.ActionProcessingPipeline.processPipeline(ActionProcessingPipeline.java:603) at org.jboss.soa.esb.listeners.message.ActionProcessingPipeline.process(ActionProcessingPipeline.java:433) at org.jboss.soa.esb.listeners.message.MessageAwareListener$TransactionalRunner.run(MessageAwareListener.java:540) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [org.drools.persistence.processinstance.ProcessInstanceInfo#14] at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:1792) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2435) at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635) at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365) at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504) ... 45 more _______________________________________________ rules-dev mailing list rules-dev@lists.jboss.org<mailto:rules-dev@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-dev