@RequestMapping(value = "adduser.htm", method = RequestMethod.POST)
 public String registerUser(@ModelAttribute("RegisterUser") User user, Model model) {
   regdao.addUser(
       regdao.maxKey("User", "user_id") + 1,
       user.getUsername(),
       user.getFirst_name(),
       user.getLast_name(),
       user.getProfile_pic(),
       user.getEmail(),
       user.getPassword());
   return "Register";
 }