相关疑难解决方法(0)

我正在尝试在Hibernate 4.3.5/JPA2对象中使用orphanRemoval,但它似乎没有像我预期的那样工作.但是,如果我做错了什么,或者这仍然是Hibernate中的错误,我不确定.

鉴于以下关系(为了简洁省略了@Version,getters和setter):

@Entity
public class Provider implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    private String name;

    @OneToMany(orphanRemoval=true,cascade=CascadeType.REMOVE)
    @JoinColumn(name="provider_id", referencedColumnName="id")
    private List<Contract> contracts;
}


@Entity
public class Contract implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    private String volume;

    @OneToMany(orphanRemoval=true,cascade=CascadeType.REMOVE) // delete any attachments that were previously uploaded with this contract
    @JoinTable(name="contract_attachment", joinColumns = @JoinColumn(name = "contract_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "attachment_id", referencedColumnName = "id"))
    private …

我有一堂课叫News. 任何新闻都可以有很多Photo。这些是我的桌子

   news                   news_photo             photo
--------------      ----------------------     ------------
| id | title |      | id_news | id_photo |     | id | url |
--------------      ----------------------     ------------
  |                      |         |              |
  |----------------------|         |--------------|

这是我的班级News

@Entity    
@Table(name = "news")
public class News extends ElementoPersistente implements Serializable{  
    ...
    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, orphanRemoval = true)
    @JoinTable(name = "news_photo",
               joinColumns = { @JoinColumn(name = "id_news")},
               inverseJoinColumns = { @JoinColumn(name = "id_photo") }) 
    private List<photo> photos;
    ...
} …