public ActionForward execute(ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response) throws Exception 
{
        // Create a RequestDispatcher the corresponding resource
        String path = mapping.getParameter();
        if (path == null) {
            throw new ServletException(messages.getMessage("include.path"));
        }
        RequestDispatcher rd =
            servlet.getServletContext().getRequestDispatcher(path);
        if (rd == null) {
            throw new ServletException(messages.getMessage("include.rd", path));
        }
        // Unwrap the multipart request, if there is one.
        if (request instanceof MultipartRequestWrapper) {
            request = ((MultipartRequestWrapper) request).getRequest();
        }
        // Forward control to the specified resource
        rd.include(request, response);
        // Tell the controller servlet that the response has been created
        return (null);
}

Process the specified HTTP request, and create the corresponding HTTP response (or forward to another web component that will create it). Return an ActionForward instance describing where and how control should be forwarded, or null if the response has already been completed.