Spring JPA存储库:如果条件不匹配，如何向参数发送默认值

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    List<User> findByAge(@Param("age") int age);
}

@Repository
public class UserRepositoryImpl implements UserRepositoryCustom {
    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public List<User> findByAgeWithDefault(int age) {
        String query = "SELECT u FROM User u WHERE u.age = COALESCE(:age, u.age)";
        TypedQuery<User> typedQuery = entityManager.createQuery(query, User.class);
        typedQuery.setParameter("age", age);
        return typedQuery.getResultList();
    }
}

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;

    public List<User> getUsersByAge(int age) {
        return userRepository.findByAgeWithDefault(age);
    }
}