Can one ON DELETE CASCADE with a @CollectionOfElements?

Jonathan Feinberg · **Joined:** Sun Feb 13, 2005 5:00 pm **Posts:** 5

In an Entity containing

Code:

private Set<String> witticisms = new HashSet<String>();

@CollectionOfElements
public Set<String> getWitticisms()
{
    return witticisms;
}

is there any way to ask Hibernate to emit DDL that causes the foreign key declaration in the collection table to include ON CASCADE DELETE, as one can with an association between entities, as in

Code:

@OneToMany(mappedBy = "parent")
@OnDelete(action = OnDeleteAction.CASCADE)
public Set<Child> getKid()
{
    return kid;
}

emmanuel · **Posted:** Tue Feb 20, 2007 8:22 pm

did you try? Does it work?

Jonathan Feinberg · **Joined:** Sun Feb 13, 2005 5:00 pm **Posts:** 5

emmanuel wrote:

did you try? Does it work?

Yes, I tried before posting. The result is

Code:

org.hibernate.MappingException: only inverse one-to-many associations may use on-delete="cascade": my.org.Raconteur.witticisms
   at org.hibernate.mapping.Collection.validate(Collection.java:265)
   at org.hibernate.mapping.Set.validate(Set.java:19)
   at org.hibernate.cfg.Configuration.validate(Configuration.java:1106)
   at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1287)
   at my.org.MyHibernateUtil.<clinit>(MyHibernateUtil.java:39)
   ... 23 more

The point of my question was to determine whether there's any way to get Hibernate to emit ON DELETE CASCADE for a @CollectionOfElements, just as it will do so for an inverse association.

If it is impossible to do so, then I will create an entity to contain the String, and associate them. I would consider it a kluge to have to do so, hence my question. The question was asked in good faith.

emmanuel · **Posted:** Tue Feb 27, 2007 6:57 pm

open a JIRA issue, but it won't be high priority. I think it has to do with messing up with hibernate's entity lifecycle