Error-page URL in web.xml keep being called

Question

I'm trying to set up common "Error page" in my spring mvc app.

It is working fine when happened 404 error with the following setup but the "/app/404.do" is keep being called when the other normal URL link is clicked..

I used tiles framework but the error pages is a just JSP file.

Can you please advise on this?

web.xml

 <error-page>
     <error-code>404</error-code>
     <location>/app/404.do</location>           
 </error-page>

spring

    @RequestMapping(value = "/app/404.do")
    public ModelAndView pageError404(HttpServletRequest request, Model   model) {

    logger.info("page error code 404");
    pageErrorLog(request);
    model.addAttribute("errorMsg", "There is no page you requested.");

    return new ModelAndView("error/error", "model", model);
   }

JSP

    <div align="center">
        <c:out value='${errorMsg}' />
    </div>