for the limitation of only one or zero relation can set fetchtype as eager.so in some case, fetch=FetchType.EAGER is useful. but I have try to invoke getXXXXX() within the session, it still throw the same exception. At it happens, I want use system out to see the result just like System.out.println(getXXXX()), and run my test case again,oh my god ,it passed. what happen? I then try to call getXXXX().toString(), it still work. Would anybody tell me what it is going on. thank you? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4229612#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...