1 Reply Latest reply on Jul 25, 2007 6:26 PM by genman

Could not synchronize database state with session

genman Jul 25, 2007 2:47 PM

JBoss 4.2.0

Appears to be a classloader issue, and maybe more a question for Hibernate people. But it happens during commit. The class in question is located and scoped in a .ear file.

I'm using an MDB that's operating on some EJB3 entities and doing a store. Haven't had this problem before in other scenarios, I'm not sure why Hibernate can't find the class. Could it be because the Arjuna isn't setting the right classloader?

2007-07-25 11:31:34,056 ERROR [AbstractFlushingEventListener] Could not synchronize database state with session
org.hibernate.type.SerializationException: could not deserialize
 at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:214)
 at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:240)
 at org.hibernate.type.SerializableType.fromBytes(SerializableType.java:82)
 at org.hibernate.type.SerializableType.deepCopyNotNull(SerializableType.java:74)
 at org.hibernate.type.MutableType.deepCopy(MutableType.java:25)
 at org.hibernate.type.SerializableToBlobType.deepCopy(SerializableToBlobType.java:102)
 at org.hibernate.type.TypeFactory.deepCopy(TypeFactory.java:353)
 at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:114)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
 at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:515)
 at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:114)
 at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:249)
 at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:88)
 at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)
 at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1256)
 at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:135)
 at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87)
 at org.jboss.resource.adapter.jms.inflow.JmsServerSession$XATransactionDemarcationStrategy.end(JmsServerSession.java:494)
 at org.jboss.resource.adapter.jms.inflow.JmsServerSession.run(JmsServerSession.java:248)
 at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:204)
 at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:275)
 at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
 at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: com.example.msg.Message
 at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:306)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:514)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:408)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:242)
 at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:574)
 at org.hibernate.util.SerializationHelper$CustomObjectInputStream.resolveClass(SerializationHelper.java:268)
 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1538)
 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
 at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:210)
 ... 28 more

followed by:

2007-07-25 11:31:34,058 WARN [arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_2] TwoPhaseCoordinator.beforeCompletion - failed for com.arjuna.ats.inte
rnal.jta.resources.arjunacore.SynchronizationImple@169e486
javax.persistence.PersistenceException: org.hibernate.type.SerializationException: could not deserialize
 at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:629)
 at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:524)
 at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:114)
 at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:249)
 at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:88)
 at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)
 at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1256)
 at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:135)
 at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87)
 at org.jboss.resource.adapter.jms.inflow.JmsServerSession$XATransactionDemarcationStrategy.end(JmsServerSession.java:494)
 at org.jboss.resource.adapter.jms.inflow.JmsServerSession.run(JmsServerSession.java:248)
 at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:204)
 at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:275)
 at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
 at java.lang.Thread.run(Thread.java:595)
Caused by: org.hibernate.type.SerializationException: could not deserialize
 at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:214)
 at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:240)
 at org.hibernate.type.SerializableType.fromBytes(SerializableType.java:82)
 at org.hibernate.type.SerializableType.deepCopyNotNull(SerializableType.java:74)
 at org.hibernate.type.MutableType.deepCopy(MutableType.java:25)
 at org.hibernate.type.SerializableToBlobType.deepCopy(SerializableToBlobType.java:102)
 at org.hibernate.type.TypeFactory.deepCopy(TypeFactory.java:353)
 at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:114)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
 at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:515)
 ... 13 more
Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: com.example.msg.Message
 at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:306)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:514)
 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:408)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:242)
 at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:574)
 at org.hibernate.util.SerializationHelper$CustomObjectInputStream.resolveClass(SerializationHelper.java:268)
 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1538)
 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)
 at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
 at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:210)
 ... 28 more

The transaction gets processed about 10 times, then the MDB gives up.

I checked the release notes for 4.2.1, didn't see any JIRA issue addressing this one.

1. Re: Could not synchronize database state with session

genman Jul 25, 2007 6:26 PM (in response to genman)

I figured out how this problem can be reproduced...

If you create an EJB3 entity with a Object stored as a BLOB, then modify the fields of this BLOB, during the container EntityManager.flush(), it can't locate the class to load. That is, if the class is scoped.

I'm guessing this is a Hibernate issue, unless the TX man isn't passing the right classloader to it.
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