TransactionTest.java

TransactionService.java

public AService {
  @Autowired private ARepository repository;
  
  @Transactional
  public void save(A a) {
   repository.save(a);
   // update(a); // update 트랜잭션 적용안됨 XXX
  }
  
  @Trnasaction(propagation = Propagation.REQURIES_NEW)
  public void update(A a) {
    return repository.save(a);
  }
  
}

public class BService {
  @Autowired private BRepository repository;
  
  public void save(B b) {
   repository.save(b);
  }
  
  public void update(A a) {
    return repository.save(a);
  }
}

public class FrontService { // 컨트롤러에서 사용하는 서비스
  @Autowired AService aService;
  @Autowired BService bService;
  
 @Transactional  // OK
 public void saveAB(ADto adto, BDto bdto) {
  // dto -> A, B로 컨버팅 됐다고 가정
   
   save(b);
   save(a);
 }
  
 public void saveOnlyA(ADto adto) {
  // dto -> A로 컨버팅 됐다고 가정
   save(a); // ok
 }
}