@PostMapping("/sign-up")
  public void signUpOwner(@RequestBody MultiValueMap <String , String > json ) throws ApplicationException, Exception {
        String username = json.get("username").toString();
        String password =json.get("password").toString();
        String email = json.get("email").toString();

@PostMapping("/sign-up")

  public void signUpOwner(@RequestBody ApplicationUser user) throws ApplicationException, Exception {

        String username = user.getUsername();
        String password = user.getPassword();
        String email = user.getEmail();