oups, don't care about READ_UNCOMMITTED in conf file, it is SERIALIZABLE I use. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4157736#4157736 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4157736