@RequestMapping(value = "/add", method = RequestMethod.POST)
  public String addUser(
      @ModelAttribute("user") User user,
      BindingResult result,
      final RedirectAttributes redirectAttr) {
    if (result.hasErrors()) {
      redirectAttr.addFlashAttribute("error", true);
      redirectAttr.addFlashAttribute("message", result.getFieldError().getDefaultMessage());
      return "redirect:/user/add";
    }
    service.create(user);
    redirectAttr.addFlashAttribute("success", true);
    redirectAttr.addFlashAttribute("message", "Success add user!");

    return "redirect:/user";
  }