It seems that the problem is related with the fact that JBoss is not exposing the UserTransaction under java:comp/UserTransaction (that I think it's the standard or at least recommended place to expose it), it's exposed under the global JNDI namespace as 'UserTransaction'. So, I've made changes as shown in this patch: ### Eclipse Workspace Patch 1.0 | #P jbpm | Index: jpdl/jar/src/main/config/hibernate.cfg.xml | =================================================================== | RCS file: /cvsroot/jbpm/jbpm.3/jpdl/jar/src/main/config/hibernate.cfg.xml,v | retrieving revision 1.11 | diff -u -r1.11 hibernate.cfg.xml | --- jpdl/jar/src/main/config/hibernate.cfg.xml 22 Sep 2006 14:23:25 -0000 1.11 | +++ jpdl/jar/src/main/config/hibernate.cfg.xml 11 Oct 2006 10:20:58 -0000 | @@ -26,7 +26,7 @@ | | <!-- JTA transaction properties (begin) === | <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property> | - <property name="jta.UserTransaction">java:comp/UserTransaction</property> | + <property name="jta.UserTransaction">UserTransaction</property> | ==== JTA transaction properties (end) --> | | <!-- CMT transaction properties (begin) === Regards. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977483#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...