Ok now I got it. Thanks a lot ! In fact it's very useful but in a small number of cases :) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4077659#4077659 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4077659