When I tred to return in method newly created object, It's works, but if it is get from database there become such error. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4248083#4248083 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4248083