Forms should be request based unless they are carried across more than one page, e.g. as in a wizard. Most of the time, you should be able to stuff biz objects directly into a form (and not flatten them out; i.e. create fields in the form for each field in the biz object). Struts should be able to deal with populating and returning nested objects.
A form's job is data input. It should not be used for data output unless some of that data is used as input too (this does not mean dropdowns, etc). Output data should be stuffed into the request by using request.setAttribute. You can then access the data in the jsp using the c taglib. Any data that is required for more than one screen, e.g. dropdown data that doesn't change, etc, can be stored in the session.
