... thanking you so muche. That is work good now and my screen show this datas in droplist. Next Q from here ... We have class Atom and class Molecule. Molecule "has a" Atom (in our codes this in real mean Molecule has atomId property). Molecule has also the another property, atom_quantity. We want builder 1 screen with just droplist for show all atoms like original "challenge" in the an other email (the descriptives name is in a property which ptSymbol) and this the screen have also the text input field of atom_quantity. But we have teh an other problem wit to convert Atom from droplist user-selection to a atom_id which is need must be a '"java long' in the Exception I am see now because ofcourse, table need must just id *not* all object the Atom. Do we need convertEntity somewere to make Atom of list to being a long "id" ? I think this must simple, or ...? Is it an example on web we cannot find it ? I hope you can know the answer because we take time for the small each step forward each day :-)) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4033366#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...