SessionUtils.validSessionVerification(request, mapping);
  public ActionForward execute(ActionMapping mapping, ActionForm form,                                HttpServletRequest request,                                HttpServletResponse response)      throws Exception {        HttpSession sessao = request.getSession(false);    if (sessao != null) {         /* Obtem o parametro do submit que indica a operacao a realizar */        String parameter = request.getParameter(new String("operation"));        		return mapping.findForward(parameter);		    } else      throw new Exception();  // nao ocorre... pedido passa pelo filtro Autorizacao   }