hello! thank you very much for your advice. Unfortunately I cannot follow your approach because the number of fields are built at runtime - in other words the user creates at runtime a View of the table. I should add all possible constructors (they're about 20 fields :-( ) maybe I should create a Native Query..if I don't have other options... thanks anyway marco View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4217318#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...