@RequestMapping(value = "/validate", method = RequestMethod.POST)
@ResponseBody
public ModelAndView(HttpServletRequest request, HttpServletResponse response, Model model) {
    String userName = request.getParameter("userName");
    String password = request.getParameter("password");
    boolean validuser=employeeService.checkLogin(userName,password);
    if(validuser == true)
    {
        model.setViewName("success");
        return model;
    }
    model.setViewName("login");
    return model;
}

$(document).ready(function() {
      $("form").submit(function() {
         var userName=$("#inputEmail").val();
         var password=$("#inputPassword").val();
            $.ajax({
                type : "post",
                url : "${pageContext.request.contextPath}/validate",
                data : {userName:userName, password:password},
                success:function(data){
                    alert(data);
                },
                error:function()
                {
                    alert("Error ");
                }
                });
      });
    });