@Transactional 不能从预定的方法工作

Question

I have two classess as below.

@Component
@RequiredArgsConstructor
public class SomeScheduler {
    
    private final SomeService someService;

    @Scheduled( ... )
    void doScheduledJob() {
         someService.doJob();
    }
}

@Service
@RequiredArgsConstructor
@Transactional
public class SomeService {
    
    private final SomeRepository someRepository;

    public void doJob() {
        someRepository.findByCustomized();
        
        ...
    }
}

The problem is that SomeService is working without @Transactional .

With configuration in application.yml logging.level.org.springframework.transactional.interceptor: DEBUG , I found that there are some logs like No need to create transaction for [org.springframework.data.jpa.repository.support.SimpleJpaRepository.findByCustomized]: This method is not transactional.

What I wanna know is:

1. There is no transctional on service method. Why? (If I change with MANDATORY propagation, it throws exception)
2. my repository method which has @Query annotation works. I've thought that 'JPA requires transaction' but it wasn't. Why?

I've searched this for a while, but couldn't understand. Can any one explain this or show me any article about?

Thank you.

Answer 1

looks like "findByCustomized" is a non-modifiable query method (aka select), there is no need in transaction thus