实体更新导致错误：所属实体不再引用级联=“所有删除的孤儿”

Question

我具有以下表实体，因为我正在尝试更新现有记录，但同时出现以下错误。我知道我在实体定义中犯了一些错误，但无法弄清楚。感谢您的帮助。

                **A
        -------------------
        |                 |
        B                 C
                      ---------
                      |       |
                      D       E**

@Entity
@Table()
public class A {
    @Id
    Long id;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="id",  nullable = false)
    private Set<B> b;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="ID",  nullable = false)  
    private Set<C> c;
}

@Entity
@Table()
public class B{
    @Id
    Long id;
}

@Entity
@Table()
public class C{
    @Id
    Long id;
    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="id",  nullable = false)
    private Set<D> D;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval=true)
    @JoinColumn(name = "id", referencedColumnName="ID",  nullable = false)  
    private Set<E> E;
}

@Entity
@Table()
public class D{
    @Id
    Long id;
}

@Entity
@Table()
public class E{
    @Id
    Long id;
}

错误：

org.hibernate.HibernateException：拥有实体实例不再引用具有cascade =“ all-delete-orphan”的集合：com.entity.C.D

at org.hibernate.engine.internal.Collections.processDereferencedCollection(Collections.java:100) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]
at org.hibernate.engine.internal.Collections.processUnreachableCollection(Collections.java:51) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.flushCollections(AbstractFlushingEventListener.java:262) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:95) ~[hibernate-core-5.3.12.Final.jar:5.3.12.Final]

Answer 1

映射取决于关联的所有权，考虑您的示例，很难指出，但是您可以选中post以更好地理解使用一种或另一种方法时的后果以及数据库中的后果。我不知道这种情况是否发生在您的更新中，但是在更新子项时，您需要清除过去的集合并使用addAll方法来避免这种错误。还要检查此post。