Spring-data-jpa具有相同标识符值的不同对象已与会话关联

Question

我已经搜索了相当的解决方案，但仍然没有解决方案

@Entity
@Table(name = "documents")
public class Documents {

    @Id
    @Column(name = "doc_id", unique = true, nullable = false)
    private String id;

    @Column(name = "type")
    private String type;

    @Column(name = "url")
    private String url;

}

public class Address {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "address_id", unique = true, nullable = false)
    private Integer addressId

    @OneToMany(cascade = { CascadeType.ALL })
    @JoinTable(name = "address_docs", joinColumns = @JoinColumn(name = "address_id"), inverseJoinColumns = @JoinColumn(name = "doc_id"))
    private List<Documents> doc;

}

public class Grd {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "grd_id", unique = true, nullable = false)
    private Integer grdId

    @OneToMany(cascade = { CascadeType.ALL })
    @JoinTable(name = "grd_docs", joinColumns = @JoinColumn(name = "grd_id"), inverseJoinColumns = @JoinColumn(name = "doc_id"))
    private List<Documents> doc;

}

public class Person {

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "grd_id", referencedColumnName = "grd_id")
    private Grd grd;

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "address_id", referencedColumnName = "address_id")
    private Address address;

}

当我将所有数据放入Person对象并保存对象时，它会给我错误

org.springframework.dao.DataIntegrityViolationException: A different object with the same identifier value was already associated with the session

根据我的解决方案，我发现我已经将CascadeType改为MERGE，用于类Address和Grd。但现在我收到了错误

org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [fk_address_doc_2]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement

我该如何做到这一点？