Ok - thanks, you helped a lot - perhaps I don't understand everything, but I'm on the way now - and I got an idea about understanding all that. Now there's the next problem I've got. If I understood right after googling the RAD generates non-JBoss-conform EJBQL - and so the Error tolds me I saw in the log-File. So I made a jbosscmp-jdbc.xml beside the jboss.xml with code for each query: | <enterprise-beans> | <entity> | <ejb-name>Data</ejb-name> | <query> | <query-method> | <method-name>ejbSelectLastId</method-name> | <method-params> | </method-params> | </query-method> | <ejb-ql><![CDATA[select max(o.data_id) from Data o]]></ejb-ql> | </query> | </ejb-name>Data</ejb-name> | <!--[... donefor each EJB and query...]--> | </entity> | </enterprise-beans> | | But RAD now gives syntax error - and I'm also not sure, if my file is correct - and will solve the EJB-problems. For 2.: I also use direct SQL. The lookup for this - I'm not sure, if it will work - what lookup I have to put there? The same as for the EJB's? Hope for another great answer ;-) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4123562#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...