[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-747) @CollectionOfElements does not cascade on delete

[Richard Bowers (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30513 ] 

Richard Bowers commented on ANN-747:
------------------------------------

I've hit exactly the same with a collection of enums. (I would hazard a guess that primitives are also affected.)

Interestingly, adding the @OnDelete annotation to the collection does work for running hbm2ddl, with the on delete cascade added to the tables produced. But as Nicole says, Hibernate is not happy with this when the SessionFactory is created.


> @CollectionOfElements does not cascade on delete
> ------------------------------------------------
>
>                 Key: ANN-747
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-747
>             Project: Hibernate Annotations
>          Issue Type: Bug
>    Affects Versions: 3.3.1.GA
>         Environment: Hibernate 3.2.6 GA
> Database: H2 1.0.72
>            Reporter: Nicole Rauch
>
> Consider the following constellation:
> @Embeddable
> public class Foo {
>    // ...
> }
> @Entity
> public class Bar {
>    @CollectionOfElements
>     private Set<Foo> myFoos;
>     // ...
> }
> When I persist a Bar object that contains some Foos, and when I later decide to delete the Bar object, I get a foreign key constraint violation error message because the Foo objects, which contain a reference to the Bar object that owns them, are not deleted automatically. I would expect the default behaviour to be "on delete cascade" because the Foo objects are embeddables, thus they cannot exist on their own without the Bar object that owns them. But there is no way to tell Hibernate to cascade:
> - the @OnDelete annotation is only allowed for OneToMany relations
> - the @Cascade annotation is being ignored
> - there is no "cascade" property for the CollectionOfElements
> So my question is: Why does the cascading not occur automatically, and how do I tell Hibernate to cascade anyways?
> Thanks a lot in advance,
> Nicole

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