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Hibernate持久化实体意外行为

[英]Hibernate persisting entity unexpected behavior

我有亲子关系:

public class Parent{
    private int id;
    @OneToMany(cascade = CascadeType.ALL, mappedBy="parent", orphanRemoval=true)
    private List<Child> childs = new ArrayList<>();
}

public class Child{
    private int id;
    @ManyToOne
    private Parent parent;
}

我创建了一个函数来保留父级的子级:

public void persist(Parent obj) {
        Session session = HibernateUtil.sessionFactory.openSession();
        Transaction tx = null;
        try {
            tx = session.beginTransaction();
            session.saveOrUpdate(obj);
            tx.commit();
        } catch (HibernateException e) {
            if (tx != null)
                tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
    }

由于父实体beign保留在一项事务中,因此Hibernate的预期行为是:如果在插入子代时出错,则也不会插入父代,但是我得到了一些不同的东西!
Hibernate插入了父级,而当未插入子级时,回滚没有发生! 所以我发现自己只和父母在数据库中!
那是正常的还是我做错了什么?

尝试这样:

public class Parent{
    @Id
    @Column(name = "id", unique = true, nullable = false)
    private int id;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL,mappedBy="parent", orphanRemoval=true)
    private List<Child> childs = new ArrayList<>();
}

public class Child{
    @Id
    @Column(name = "id", unique = true, nullable = false)
    private int id;

    @Column(name = "parent_id", nullable = false)
    private int parent_id;

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name = "parent_id", insertable = false, updatable = false)
    private Parent parent;
}

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