Servlet value passing JSP

servlet：
        if (result == 1){      
            request.setAttribute("mess", userName);
            request.getRequestDispatcher("login_ok.jsp").forward(request, response);

        }else {
            response.sendRedirect("./login_error.jsp");        // Redirect to ./login_error.html
        }

jsp：

<label style="align-content: center">${mess} Login account succeeded , please 
    <a href="login.jsp" style="color:blue;"> continue </a></label>