I know it's possible in Hibernate to have a collection of Strings, for example, and map that. Reading the EJB3.0 book that I have, it only mentions collections of Entities. Is this true? Can EJB3 only handle collections of Entities? If so it's no big deal; the object that I want to represent (IP addresses) are probably better represented as entities, but I'm just wondering. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996228#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...