public User getUser(String username) {
   return userDao.getUserByUsername(username);
 }
 public boolean exists(String username) {
   return userDao.exists(username);
 }
 @Secured("ROLE_ADMIN")
 public List<User> getAllUsers() {
   return userDao.getAllUsers();
 }
 public void create(User user) {
   userDao.create(user);
 }