sgp>public class TestService {
sgp>    @Autowired
sgp>    private JpaRepository<User, String> userRepository;

sgp>    @Transactional
sgp>    void testTransaction(){
sgp>        User user = new User("Tom");
sgp>        userRepository.save(user);
sgp>        throw new RuntimeException("Test exception");
sgp>    }
sgp>}
sgp>