I will try to describe the problem more in detail!! Query code: | <query> | <description></description> | <query-method> | <method-name>findMaxId</method-name> | <method-params></method-params> | </query-method> | <ejb-ql>select object(o) from User_statistic o where o.id = (select max(u.id) from User_statistic u)</ejb-ql> | </query> | Whether the query is correctly written? If there is no that as it to correct? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4174274#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...