Thanks a lot for your reply. It has the default value of 15000 (15 seconds?) Should I reduce it? In my code I always do a UserTransaction.commit() and a UserTransaction.setRollBackOnly in case of an exception inside the transaction. Do I have to take any other actions to be sure that transactions are commited or rolledback? thanks again, Ignacio View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4108908#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...