Most TMs have some kind of transaction timeout if a tx lasts too long. That might be a problem here. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4051968#4051968 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4051968