UPDATE: MySQl does support XA now You have to use mysql-connector-java-5.1.5 or newer for successful XA integration. I have copied the example script from docs\examples\jca\oracle-xa-ds.xml and adapted it to my needs. Now XA is running perfectly. Besides mysql we are using Oracle XE in our developing environment. This db does not support XA. For production and Testing we can use a full orace server which does support XA. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135209#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...