Thanks a lot! It was a database problem. I use the MySQL DB and forgot to switch to the InnoDB which supports transactions. Greetings Markus View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3975436#3975436 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3975436