@RequestMapping(value = "/produk/form", method = RequestMethod.POST)
  public String prosesFormProduk(
      @ModelAttribute @Valid Produk p, BindingResult hasilValidasi, SessionStatus status)
      throws Exception {

    p.setTerakhirUpdate(new Date());

    if (hasilValidasi.hasErrors()) {
      return "/produk/form";
    }

    produkDao.simpan(p);
    status.setComplete();
    return "redirect:list";
  }