Having looked at this I've come to the conclusion that trying to support non-primitive, non-primitive-wrapped or non-String Ids in a generic fashion isn't sensible. So in the new design of SeamSelectItems http://wiki.jboss.org/wiki/Wiki.jsp?page=SeamSelectItemsNewDesign I've made the Entity Converter really easy (I think) to extend to support complex id's - essentially you provide a conversion strategy from complex id object to string and back. AFAIK @EmbeddedID is only used for 'complex' id's so there is no need to check for it... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3984942#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...