Classloading issue either with JMS inflow, TM, or Hibernate
Issue with JBoss 4.2.0
Hibernate can't seem to find my class when it does a commit from a MDB. It seems Hibernate doesn't know the classloader, and
The way to reproduce this is to create an EJB3 entity with a Serializable field, modify that field in an MDB, and you get this:
2007-07-25 11:14:41,313 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
Looks like serialization expects the context classloader to be set correctly for the calling thread:
public final class SerializationHelper {
...
/**
* Custom ObjectInputStream implementation to more appropriately handle classloading
* within app servers (mainly jboss - hence this class inspired by jboss's class of
* the same purpose).
*/
private static final class CustomObjectInputStream extends ObjectInputStream {
ClassLoader loader = Thread.currentThread().getContextClassLoader();