Prepopulate a DynaForm

[Alexander Czernay]

I'm trying to prepopulate a DynaForm with some values - right now just 
hard-coded, later should be taken from a DB. For that I'm using a 
SetupAction, that is called to prepopulate the form, insert it into the 
request and after that forward to the actual action for presenting the 
form to the user.

Looks like this:
public class MediaArchiveSetupAction extends Action {
     public ActionForward execute(ActionMapping mapping,
           ActionForm form,
           HttpServletRequest request,
           HttpServletResponse response){
        
         ActionServlet servlet = this.getServlet();
         MediaArchiveForm mediaArchiveForm = new MediaArchiveForm();
         mediaArchiveForm.setServlet(this.getServlet());

         MessageResources messageResources = servlet.getInternal();
         mediaArchiveForm.set("author", "test");
        
       // TODO: check why this doesn't work
       request.setAttribute("mediaArchiveForm", mediaArchiveForm);
       // this does actually work
       request.setAttribute("test", "dummy");

         return (mapping.findForward("success"));
     }
}
Using this approach I always get a null pointer exception, leading me to 
the presumption that the actual form-object isn't built.

Any ideas why?
Thanks for any help,
Alexander
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