我正在嘗試進行插入，并使用生成的實體更新同一事務中的 N 條記錄。出現錯誤“FK 不存在”，觀察查詢的日志跟蹤以觸發指令的相反順序執行。服務：@Transactionalpublic Entity1 createEntity(Entity1 newEntity){    Entity1 inserted = dao.createEntity(newEntity);    Integer numUpdated = dao.updateEntity2(newEntity)    return inserted;}Dao:public Entity1 createEntity(Entity1 newEntity){    this.em.persist(newEntity);    //now newEntity has PK    return newEntity;}public Integer updateEntity2(Entity1 newEntity){    CriteriaBuilder cb = em.getCriteriaBuilder();    CriteriaUpdate<Entity2> uq = cb.createCriteriaUpdate(Entity2.class);    Root<Entity2> rootEntity2 = uq.from(Entity2.class);    uq.set(rootEntity2 .get(Entity2_.entity1), newEntity);    return em.createQuery(uq).executeUpdate();  }實體：@Entitypublic class Entity1 implements Serializable {    [...]    @OneToMany(mappedBy="entity1",fetch=FetchType.LAZY)    private List<Entity2 > entity2s;    [...]}@Entitypublic class Entity2 implements Serializable {    [...]    @ManyToOne(fetch = FetchType.LAZY)    @JoinColumn(name="E1_ID")    private Entity1 entity1;    [...]}這個想法是不必用刷新來關閉事務，因為我知道寫下事務性的方法應該允許這樣做