拥有的实体实例不再引用具有 cascade="all-delete-orphan" 的集合如何处理？答案

【问题标题】：A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance how to deal with it?拥有的实体实例不再引用具有 cascade="all-delete-orphan" 的集合如何处理？
【发布时间】：2023-03-17 22:38:01
【问题描述】：

这可能是什么问题？

Caused by: org.hibernate.HibernateException: A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance: com.en.test.father.Father.listSons
    at org.hibernate.engine.internal.Collections.processDereferencedCollection(Collections.java:99)
    at org.hibernate.engine.internal.Collections.processUnreachableCollection(Collections.java:50)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushCollections(AbstractFlushingEventListener.java:243)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:86)
    at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:44)
    at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1251)
    at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:1962)
    at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:322)
    at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:125)
    at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
    at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483)

我的 getter 和 setter 方法

@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @org.hibernate.annotations.Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
    @JoinColumn(name = "FATHERID", nullable = false)
    @OrderBy("id ASC")
    public List<Sons> getListSons() {
        return listSons;
    }

    public void setListSons(List<Sons> listSons) {
            this.listSons.clear();
            this.listSons.addAll(listSons);
    }

我认为该列表不应该初始化而是清除然后添加元素，但即使这样我也得到了这个错误

【问题讨论】：

标签： java hibernate

【解决方案1】：

您尚未显示您的域模型，但可能旧的儿子列表仍然引用父亲实体。将每个 Son 对象的父亲字段设置为 null。它看起来像这样：

    public void setListSons(List<Sons> listSons) {
            this.listSons.stream().forEach(oldSon -> oldSon.setFather(null));
            this.listSons.clear();
            this.listSons.addAll(listSons);
    }

【讨论】：