[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-527) reference a target entity (in a collection) by entity name

[Börcsök József (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-527?page=comments#action_26226 ] 

Börcsök József commented on ANN-527:
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I have a similar usecase: my domain model contains events and members. Events can be Camp or Conference (so event is an abstract entity, Camp and Conference contains specific properties too)

Members have attributes like name, email, ... and CampMember and ConferenceMember also have specific properties.

So my entity classes should be (using generics):

event entities:
   Event, Camp extends Event, Conference extends Event

member entities
   Member<T extends Event>                (0..*) ---------<> (1..1)             T
   CampMember extends Member<Camp>
   ConferenceMember extends Member<Conference>

on deploy I've got  the following exception:
Property Member.event has an unbound type and no explicit target entity. Resolve this Generic usage issue or set an explicit target attribute (eg @OneToMany(target=) or use an explicit @Type


@OneToMany annotation has no target but targetEntity property. I've tried the targetEntity property and the @Type annotation but neither has worked :(

> reference a target entity (in a collection) by entity name
> ----------------------------------------------------------
>
>          Key: ANN-527
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-527
>      Project: Hibernate Annotations
>         Type: New Feature

>   Components: binder
>     Reporter: Armin Haaf

>
>
> It is only possible to reference a targetEntity by class.
> @ManyToMany(targetEntity = TestImpl.class)
> List<Test> myList;
> This makes it impossible to exchange TestImpl.class implemention by another implemention by the mappings definition.
> It would be helpful to reference a targetEntity by name.
> @ManyToMany(targetEntityName = "Test")
> This would help a lot to implement moduls and frameworks.
> Another way to support this would be to search for a implementation of the collection elements (which are typically Interfaces) in the mapped entities 

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