the JtaDbPersistenceServiceFactory was developed rather specifically for 2 use cases. It should support the enterprise beans CMT transactions and it should also support the web application with the same configuration. The web application uses hibernate transactions. Took me quite a while to get that combination to work. So I'm not sure of wether this is a problem due to the specific nature of this persistence service factory and hence that the nested transactions are just is out of scope. Or wether this can be easiliy fixed in the context sketched above. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4046983#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...