} else { throw new UnknownEntityException("Unknown user '" + user + "'"); }
    public void saveUser(User user) throws DataBackendException, UnknownEntityException {        boolean userExists = false;        userExists = checkExists(user);        if (userExists) {            getPersistenceHelper().updateEntity(user);        } else {            throw new UnknownEntityException("Unknown user '" + user + "'");        }    }