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https://issues.apache.org/jira/browse/OPENJPA-593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Linskey updated OPENJPA-593:
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Fix Version/s: (was: 1.1.0)
1.2.0
> Embedded element/key/value types should not be limited to simple fields and
> direct relations to other persistent types, but allow embedded Collections
> ------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: OPENJPA-593
> URL: https://issues.apache.org/jira/browse/OPENJPA-593
> Project: OpenJPA
> Issue Type: Improvement
> Components: jdbc
> Affects Versions: 1.1.0
> Reporter: Michael Vorburger
> Fix For: 1.2.0
>
>
> It's a pitty that @PersistentCollection(elementEmbedded = true) only works to
> to "depth 1", that is you can apparently not have an @Entity class A {
> @PersistentCollection(elementEmbedded=true) private Set<B> bs = new
> HashSet<B>(); ... } with @Entity class B again a {
> @PersistentCollection(elementEmbedded=true) private Set<C> bs = new
> HashSet<C>(); ... }.
> On OpenJPA 1.1, this leads to the error:
> "org.apache.openjpa.util.MetaDataException: "X.y<element:class Y>" is mapped
> as embedded, but embedded field "..." is not embeddable. Embedded
> element/key/value types are limited to simple fields and direct relations to
> other persistent types."
> The expected outcome would to have a schema with an SQL table A, an A_B (that
> works already!), and an A_B_C table (that doesn't work).
> JPA 2.0 JSR 317 <http://jcp.org/en/jsr/detail?id=317> says "... support for
> collections of embedded objects, multiple levels of embedded objects ..." so
> may this will be supported 'soon-ish' (that one liner may not refer to this
> exact use case)?
> PS: This limitation has unfortunately turned into a show stopper for our use
> of OpenJPA, and made us look at another ORM which seems to support this kind
> of mapping.
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