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Hibernate version:
3.1.3

Hi, I mapped a legacy table with table-per-class-hierarchy strategy. All the subclasses only differs from eeach other by the discriminator, which means all the properties are the same as the super class. To match it this way is because all the required queries are all directly to subclasses, use inheritance mapping saves me a lot of restriction passing from higher layer in the application, and it did improve some performance. Now my trouble is I have to physically create the Java class for each subclass, even it only just extends the super class with empty body. Is there a way to save this Java class creation? I tried to use the same name attribute for each subclass with superclass name, and use entity-name to distinguish each subclass, but I got a WrongClassException at runtime, Hibernate complains that when populating ids for the subclasses.

Any help? Thanks a lot!

If you're using union-subclass to map this, then I don't think that you can avoid having a separate class for each mapping. If you use <subclass> with a discriminator and a nested <join>, then you are only specifying one class (the one in the <class> element), so that should work for you. The downside to this is that you need a table for the superclass, so that you can join from it to the "real" tables. The superclass' table would probably contain only the IDs and discriminators, but seeing as they're unique anyway (assuming that you're currently using union-subclass) that would probably be a good thing.

the key is in the 'entity-name' property in the mapping files.
Hibernate reference: 5.3. Mapping a class more than once

also you will need the session functions with entity-name parameter:
save(String entityName, Object object) instead of save(Object object)
get(String entityName, Serializable id) instead of get(Class clazz, Serializable id)
etc...

also too, you will need to use entity-name in HQL queries

pepelnm, tenwit:

Thanks for both of your replies! It turns out using entity-name version of CreateCriteria() solved my problem. My code looks so cool now! Thanks a lot!!