关于hibernate中使用all-delete-orphan的用法

比如onetomany
hibernate设置cascade="all"的话，那么在进行联机操作的时候，如果把一端设置成inverse="false"，比如one的一方，那么many一方的与one一方失去关联关系的数据不会被删除掉，而是将关联外键设置为null，出现了孤立的数据！解决办法就是设置cascade="all-delete-orphan"
然而这种简单的设置，会出现问题
org.springframework.orm.hibernate3.HibernateSystemException: Acollection with cascade="all-delete-orphan" was no longer referenced bythe owning entity instance: xxx.Aaa.bbbList; nested exception isorg.hibernate.HibernateException: A collection withcascade="all-delete-orphan" was no longer referenced by the owningentity instance: xxx.Aaa.bbbList
Caused by: org.hibernate.HibernateException: A collection withcascade="all-delete-orphan" was no longer referenced by the owningentity instance: xxx.Aaa.bbbList

参考了http://hi.baidu.com/ekou/blog/item/aa89e80e8df9ece436d122b4.html帖子，知道如下办法可以解决
1 在实体中把setBbbList方法设置成私有private
2 在实体中增加如下方法

public void addBbbList(Bbb b) { getBbbList().add(b); b.setAaa(this);}

3 设置cascade="all-delete-orphan"
4 在dao中

DAO dao= (DAO) BeanFactory.getBean("dao");Aaa a = dao.getAaaById(id);a.getBbbList().clear();a.addBbbList(b1);a.addBbbList(b2);a.addBbbList(b3);dao.update(a);