polymorphic query

[totoliso]

Hi, i'm traying to run a polymorpich query but


Expediente ------> Iniciador
^
|
----------------
| |
Alumno (name) Otro (denominacion)

I' need to make a query to fetch all expediente where iniciador is of kind Alumno and name='xxxx', or where iniciador is of kind Otro and denominacion='xxx'.

How can i implement this query with Criteria Query, or QBE???

I've tried with HQL and queryString typing the class of iniciador but i have a mysql error.

I wonder if it could be possible to implement this query with Criteria Query, or QBE???

Thanks for any idea.
Bye!

[totoliso]

I mean Expediente "has an" Iniciador and Alumno and Otro "extends" Iniciador.