Hi,

I've configured Hibernate service for one of my J2EE application on JBOSS. My jboss-service.xml in the sar file looks like following:

<server>
<mbean code="net.sf.hibernate.jmx.HibernateService" name="jboss.jca:service=Hibernate">
<depends>jboss.jca:service=RARDeployer</depends>
<attribute name="MapResources">com/edhand/example1/Order.hbm.xml,com/edhand/example1/Item.hbm.xml</attribute>
<attribute name="JndiName">java:/hibertest</attribute>
<attribute name="Datasource">java:/example1DS</attribute>
<attribute name="Dialect">net.sf.hibernate.dialect.HSQLDialect</attribute>
<attribute name="UseOuterJoin">true</attribute>
<attribute name="ShowSql">false</attribute>
<attribute name="UserTransactionName">UserTransaction</attribute>
<attribute name="TransactionStrategy">net.sf.hibernate.transaction.JTATransactionFactory</attribute>
<attribute name="TransactionManagerLookupStrategy">net.sf.hibernate.transaction.JBossTransactionManagerLookup</attribute>
</mbean>

</server>

Hibernate is configured to use default UserTransaction of jboss. I'm getting the following exception at JTATransaction.begin() method:
java.lang.ClassCastException: org.jboss.tm.usertx.client.ServerVMClientUserTransaction
at net.sf.hibernate.transaction.JTATransaction.begin(JTATransaction.java:132)
at net.sf.hibernate.transaction.JTATransactionFactory.beginTransaction(JTATransactionFactory.java:58)
at net.sf.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:2195)
at com.edhand.example1.ItemService.addItem(Unknown Source)
at com.edhand.example1.ItemServicesEJB.addItem(ItemServicesEJB.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:683)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:185)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:297)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)

The return type of the begin() method is javax.transaction.UserTransaction

I've checked that the returned class org.jboss.tm.usertx.client.ServerVMClientUserTransaction implements javax.transaction.UserTransaction, hence is fully compatible with it. I'm at a loss to understand the reason for the ClassCastException. The class javax.transaction.UserTransaction is present in jboss-j2ee.jar and is loaded by the server.

Please help!!

Thanks,
Joydeep

Sorry, there was one mistake. javax.transaction.Transaction is the return type cast of initialcontext.lookup("UserTransaction") in the JTATransaction.begin() method. Ant the class returned is org.jboss.tm.usertx.client.ServerVMClientUserTransaction

Do you still have a problem then? It is not clear from your last post.


Sherman

Ya, I still have the problem. The exact problem is that the method JTATransaction.begin() internally invokes the following method:

initialcontext.lookup("UserTransaction");

This method expects a return type of javax.transaction.UserTransaction

and the lookup returns the following class:

org.jboss.tm.usertx.client.ServerVMClientUserTransaction

I'm getting the ClassCastException at this point.

But I've checked that both the above mentioned classes are compatible.

I really don't understand the reason for this exception. Can it be because the class javax.transaction.UserTransaction is not loaded by the server?
But this class is present in jboss-j2ee.jar which in turn is present at the lib directory of my server.

Please Help!!!

What versions of JBoss, operating systems and JVM are you using?


Sherman

It got fixed now. It was actually a classloading issue. I had the jta.jar in my war file. So the required class was getting loaded in a different context, causing the ClassCasfException/NoClassDefFoundException.

Thanks,
Joydeep

I hope someone still reads topics this old, but the thing is i had the same problem, and I don't know how to change that classLoad, since the jta.jar is already included from the Hibernate Core Library.
Could anyone help about this?