* @throws UserAlreadyExistsException
*/
public User createNewUser(String username, String password, String fullName) throws SQLException, UserAlreadyExistsException {
User oldUser = getUser(username);
if (oldUser != null) {
throw new UserAlreadyExistsException("User already Exists");
} else {
PreparedStatement s;
String sql = "INSERT INTO `user` (`user_id` ,`username` ,`password` ,`fullname` )VALUES (NULL , ?, ?, ?)";