User can select a multiple number of roles that are valid for some customer (role ids are stored in String selectedRoles). For each of the selected role the user can enter the expiry date. This I have solved by having a HashMap expiryDates where key is the roleId and the value is the expiry date.
I have fixed the jsp, but now I'm trying to fix the validation by using struts validation. What I need to do is to use the selectedRoles as keys for retrieving the expiryDates. I have tried following (and many other combinations) with no luck: