@Override
	public void createNewUser(String username, String password) throws MyEmptyUserNameException, MyEmptyPasswordException, MyUserAlreadyExistException {
        if(username == null || username.isEmpty()) throw new MyEmptyUserNameException();
        if(password == null || password.isEmpty()) throw new MyEmptyPasswordException();
        if(userDao.isUserExist(username)) throw new MyUserAlreadyExistException();
			userDao.createNewUser(username, password);
	}