I'm using EJB3 persistence under JBoss 5.0.5. (But I think this is a hibernate question) With the table structure below, I want to create a UserPreference class with a relationship to User and Preference, and a collection of String values. Note that (user_id,preference_id) is not unique in the value table, as users can have multiple values for some preferences. I want the User to have a collection of UserPreference objects, one for each preference_id, rather than one for each unique record in the user_pref_value table. That is, I'd like to map the UserPreference class to the user_pref_value table where user_id and preference_id are unique and it contains a String collection of values. Any ideas? Tables: user id (pk) preference id (pk) user_pref_value user_id (pk) preference_id (pk) value (pk) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4043335#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...