Spring Data、JPA @OneToMany Lazy fetch 在 Spring Boot 中不起作用

I have @OneToMany之间的关系FabricRoll and FabricDefect.

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(name = "fabric_roll_id", referencedColumnName = "fabric_roll_id")
private Set<FabricDefect> fabricDefects = new HashSet<>();

问题是当我得到FabricRoll by JpaRepository功能

找到所有（）

同事FabricDefect也已加载。

我只想加载FabricRoll and FabricDefect应该在调用函数时加载getFabricDefect()

Fabric Roll ServiceImpl 类

@Component
public class FabricRollServiceImpl implements IFabricRollService{
    @Autowired
    FabricRollRepository fabricRollRepository;

    @Transactional(propagation = Propagation.REQUIRED)
    @Override
    public List<FabricRoll> getAllFabricRoll() {
        FabricRoll fabricRoll1 = new FabricRoll();
        fabricRoll1.setBatchNo("34344");
        fabricRoll1.setLotNo("425");
        fabricRoll1.setPoNo("42");
        fabricRoll1.setRollLength(2343);
        fabricRoll1.setRollNo("356");
        fabricRoll1.setRollWidth(60);
        fabricRoll1.setStyleNo("354");

        FabricDefect fabricDefect = new FabricDefect();
        fabricDefect.setDefectNote("note");
        fabricDefect.setDefectPoint(3);
        fabricDefect.setSegment(3);
        fabricDefect.setYard(42);


        Set<FabricDefect> fabricDefects = new HashSet<>();
        fabricDefects.add(fabricDefect);


        fabricRoll1.setFabricDefects(fabricDefects);

        addFabricRoll(fabricRoll1);

        FabricRoll fabricRoll = null;


        return fabricRollRepository.findAll();
    }

@Override
public void addFabricRoll(FabricRoll fabricRoll) {
    fabricRollRepository.save(fabricRoll);
}

}

Break point:

Console:

看来是一个调试神器。

在调试时，由于事务仍处于打开状态，因此将在断点评估时加载监视的延迟加载实体属性。

要检查“生产”行为，您应该插入em.detach在断点之前声明或使用日志记录（按照 Manza 的建议）并检查em.getEntityManagerFactory().getPersistenceUnitUtil().isLoaded(fabricRoll1.fabricDefects())对分离的实体返回 false。

（记住注入 EntityManager 例如通过声明@PersistenceContext private EntityManager em;)