Can anybody tell why we need to cast the ActionForm in Action Class
for eg:

If this CustomActionForm extends ActionForm

public class CustomActionClass extends Action
{

ActionForward excute(ActionMapping mapping,ActionForm,HttpServletRequest request,HttpServletResponse response)
{
// (Why we need to do this for getting a value since it is submitted in the CustomActionForm)
CustomActionForm caf = (CustomActionForm)form;

}

}

Arun

Since the form is of type ActionForm you need to narrow its type down to the type you want to use. THus you will typically cast it to the form bean you have for your page