I have a situation in which I think I need to mix the <join> and <joined-subclass. elements, but of course this is prohibited by the DTD. I wouldlike any help or suggestions...

I have a simple class heirarchy as follows:



Actor has the following properties:
#Name
#Description
#StartDate

Organization and Individual have a couple properties of their own.

What complicates this is that the name and description are internationalized strings and therefore stored in a separate joined table in the database. The database schema for these is a follows (i cannot change the schema).

Actor
Actor_Id integer
StartDate date
...

ActorMessage
Actor_Id
Name
Description
Locale

Organization
Actor_Id
Industry
Region
...

Individual
Address
...

Basically, I would like to join the Actor and ActorMessages using a <join> element to persits and retrieve the internationalized actor strings from two tables (into one actor object) whil also using the <joined-subclass> elements to define my table-per-subclass inheritance structure using the table schema i have. The mapping would look something like this...



This seems like the ideal/most elegant way to describe my class model given the database schema, the problem is that the DTD doesn't allow the coexistence of the <join> and <joined-subclass> elements. I can't figure out another mapping strategy that will acheive exactly what my business model describes give the db schema. And the DB schema seems appropriate for the problem.

Any help is appreciated.

Regards,
Eric

One possibility is to map ActorMessage directly as a class associated with Actor.



Your hibernate mapping is then a straightforward <one-to-one> association instead of a <join> element.

You can keep all the same methods on Actor in your java code, but make get/setName and get/setDescription delegate to the associated ActorMessage object.