I've splved the problem !! I had to change my tables tefinition to inodb to have mysql support transactions. Bye View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4244535#4244535 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4244535