为什么AccessDeniedHandler不能与请求调度程序一起使用？

Question

public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException accessDeniedException) throws IOException, ServletException {
            //To change body of implemented methods use File | Settings | File Templates.
            logger.debug("   ++++++++++++++++++++++++ handler handling handling things :D        +++++++++++++++++++++ ");
             String love = (String) request.getAttribute("love");
         RequestDispatcher requestDispatcher = request.getRequestDispatcher("/error/403");
            logger.debug("   ++++++++++++++++++++++++ doing request forward     +++++++++++++++++++++ "+request.getAttribute("pain"));

            requestDispatcher.forward(request,response);
            request.setAttribute("love","love");

    //        response.sendRedirect(accessDeniedUrl);
    //
    //       request.getSession().setAttribute("message","You do not have permission to access this page!");


        }

这是我实现Spring安全的AccessDeniedHandler之后的句柄方法，它适用于sendRedirect但是因为我需要在另一个地方请求我必须使用请求调度程序，但它不起作用并给出404.我已经把所有日志记录级别在调试甚至跟踪，但没有打印错误，除了转到404页面。有什么想法吗？