I have 4 tables A, B, C, and D. D contains PK values of A, B, and C. D does not have its own PK.

My POJO's are: A, B, C, and BC. BC is a composite element of B and C. A contains a bag of BC's.

I need to find a list of BC's that belongs to a particular A and with a particular B value.

Tried the following HQL queries:

select elements(a.BC) from A a, B b where a.id=1 and b.id=1 and b=all elements(a.BC).B -- Oracle error

select elements(a.BC) from A a, B b where a.id=1 and b.id=1 and b=all elements(a.BC.B)-- Hibernate error

Any suggestions?

When asking questions, give at least:
the Hibernate version
your mapping documents
the Java code between sessionFactory.openSession() and session.close()
the full stack trace of any exception that occurs
the name and version of the database you are using
a debug level Hibernate log excerpt is also appreciated

Well, I am not exactly asking a debugging question. It is more about whether my strategy is right or wrong.

suggestions :)
http://forum.hibernate.org/viewtopic.php?t=928990
http://forum.hibernate.org/viewtopic.php?t=930781
Example of ternary relation mapping http://opensource.atlassian.com/projects/hibernate/secure/attachment/10500/IntVersionTest-src.zip

Thanks very much for the links. Your sample code provide an excellent example of a many-to-many relationship. However, it does not solve my problem. Any other suggestions?

I completely changed my mapping strategy. Now I have 4 POJO classes: AClass, BClass, CClass, and DClass, each maps to table A, B, C, and D respectively. DClass has 3 many-to-one associations to AClass, BClass, and CClass. Now to get a List of DClass'es, given an AClazz and BClazz, I just do

from DClass d where d.AClass=AClazz and d.BClass=bClazz

If anyone has a better solution, please let me know. Thanks.