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https://issues.apache.org/jira/browse/OPENJPA-782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655734#action_12655734
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Fay Wang commented on OPENJPA-782:
----------------------------------
ElementCollection/CollectionTable annotation and orm support for embeddables
and basic types are committed to trunk r-724437 and r-725770. Test case for orm
will be checked in later when the orm xml schema is finalized.
> Support for collections of embeddables and basic types
> ------------------------------------------------------
>
> Key: OPENJPA-782
> URL: https://issues.apache.org/jira/browse/OPENJPA-782
> Project: OpenJPA
> Issue Type: Sub-task
> Reporter: Fay Wang
> Assignee: Fay Wang
> Attachments: openjpa-782-testcase.patch, openjpa-782.patch
>
>
> Regarding jpa 2.0 embeddable, suppose Entity A contains a collection of
> embeddables.
> The collection of embeddable is stored in a separate table. @CollectionTable
> can be used to specify the table name, etc. If the @CollectionTable is not
> used, a default table name is used (see spec, p 272 ).
> The embeddable may contain the relation to EntityB in the following scenarios:
> (1) If in the embeddable, there is:
> @ManyToOne
> private EnittyB entityB;
>
> then the relation from EntityA to EntityB is OneToMany,
> and the relation from EntityB to EntityA is ManyToOne (Spec 2.5):
> @ManyToOne
> private EntityA entityA;
> (2) If in the embeddable, there is:
> @OneToOne
> private EntityB;
> then the relation from EntityA to EntityB is OneToMany,
> and the relation from EntityB to EntityA is ManyToOne (Spec 2.5):
> @ManyToOne
> private EntityA entityA;
> (3) If in the embeddable, there is:
> @OneToOne(mappedBy = "entityB")
> private EntityB
> The relation from EntityA to EnityB is OneToMany,
> and the relation from EntityB to EntityA is ManyToOne:
> @ManyToOne
> private EntityA entityA;
> The relation to EntityB will be stored in the third table (the
> CollectionTable) so that it can be associated with the embeddable. However,
> we can not use "mappedBy" in the ManyToOne relation in EntityB. How to have
> bi-directional relation between EntityA and EntityB in these situations? Is
> it possible to have a bi-directional relation between these two entities when
> embeddable is involved as described above?
> In scenario (3), an explicit "mappedBy" is specified in the embeddable, so
> that the bi-directional relation between EntityA and EntityB will be stored
> in the EntityB table, but then how can we associate EntityB with the
> embeddable when EntityA is retrieved back as embeddable itself does not have
> identity?
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