OneToOne双向映射外键自动填充

我在两个表之间有一对一的关系,但外键在我不需要映射的表上,DBA这样做是为了支持未来的更改。

让我们假设我们有User和Address,现在每个用户只有一个地址,它将以这种方式映射,但DBA相信未来可能是一对多映射,因此用户的外键位于地址上,但应用程序有用户实例,这对自动获取地址很重要。

我们做得很好,如下所示:

@Entity
@Table(name = "user")
class User {
    @Id
    @Column(name = "user_id")
    private Long id;

    //...

    @OneToOne(cascade = CascadeType.MERGE, mappedBy = "user")
    private Address address; // this attribute is crucial
}

@Entity
@Table(name = "address")
class Address {
    @Id
    @Column(name = "address_id")
    private Long id;

    @OneToOne
    @JoinColumn(name = "user_id")
    private User user; // this attribute is not needed for the business at all, but mappedBy requires it

    //...

}

数据库:

-- SQL:
CREATE TABLE user
(
    user_id INT NOT NULL,
    -- ...
    CONSTRAINT user_pk PRIMARY KEY (user_id)
);

CREATE TABLE address
(
    address_id INT NOT NULL,
    user_id INT NOT NULL,
    -- ...
    CONSTRAINT address_pk PRIMARY KEY (address_id),
    CONSTRAINT address_user_id_fk FOREIGN KEY (user_id) REFERENCES user (user_id),
    CONSTRAINT address_user_id_uk UNIQUE (user_id) -- it says it's a one to one relation for now, if in the future it won't be anymore, just remove this constraint
);

问题是当用新的地址实例保存用户实例时,用户的地址属性为 null ,所以我希望Hibernate足够聪明,能够从用户的实例中为其设置值。

我已经寻找了几天的解决方案,但仍然没有找到解决方法,同时我正在手动设置值,但我希望我不需要这样做。