3:48 p.m.
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();
|
|
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