Has anyone gotten JTA transactions to successfully work with Websphere 5.1?

I'm using Hibernate 3.0.5, with WebSphere 5.1.1.3. In my hibernate.cfg.xml file, I have the following:

<property name="connection.datasource">jdbc/DS</property>
<property name="transaction.factory_class">
<property name="transaction.manager_lookup_class">org.hibernate.transaction.WebSphereExtendedJTATransactionLookup</property>

When I try to do something that involves a transaction, I get the following error:

javax.naming.NameNotFoundException: Name comp/websphere not found in context "java:".

Based on the JIRA issue, I'd think this should work (http://opensource.atlassian.com/project ... se/HHH-198) --

I got this error when i specified java:comp/ in connection.datasource, but i did not get it when i specificed the value as jdbc/DS.

Did u specify the following tag ?

<property name="hibernate.transaction.factory_class">org.hibernate.transaction.CMTTransactionFactory</property>

Did u try to handle transaction anywhere in your code??
Moreover you should use session.getCurrentSession in case of a CMT.

Paste the piece of code from which the error is thrown.