[hibernate-issues] [Hibernate-JIRA] Assigned: (ANN-494) Determine Referenced Entity For Embeddable types from the parameterised type

Determine Referenced Entity For Embeddable types from the parameterised type ---------------------------------------------------------------------------- Key: ANN-494 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-494 Project: Hibernate Annotations Type: Improvement

Components: binder Versions: 3.2.0.cr1 Reporter: Edward Costello Assignee: Paolo "Nusco" Perrotta

When a collection is mapped using @ManyToOne or @CollectionOfElements, the entity in the collection is derived from the parametrised type of the collection. e.g. there is no need to explicitly indicate the elements of the following collection are books. @ManyToOne Set<Book> books; It would be nice if the same kind of discovery could be applied to Embeddable types when contained in a CollectionOfElements. E.g. it would be nice if Hibernate could derive that the embedded Versioned references a Book in the example below @CollectionOfElements Set<Versioned<Book>>; @Embeddable class Versioned<T> { T rightSide; Date date; } Even if it wasn't derived, it would be good to be able to specify it. Currently the only way to make the above work is to create a subclass of Versioned that explicitly binds the type parameter to Book. Without this the below exception is thrown while building the session factory Exception in thread "main" java.lang.IllegalStateException: Property rightSide has an unbound type and no explicit target entity. at org.hibernate.cfg.AnnotationBinder.addElementsOfAClass(AnnotationBinder.java:946) at org.hibernate.cfg.AnnotationBinder.fillComponent(AnnotationBinder.java:1655) at org.hibernate.cfg.annotations.CollectionBinder.bindManyToManySecondPass(CollectionBinder.java:1054) at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:543) at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:484) at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43) at org.hibernate.cfg.annotations.CollectionBinder.bind(CollectionBinder.java:377) at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1476) at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:706) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:452) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:268) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1210)