I have a series of POJO classes that are mapped with Hibernate Annotations to my database.

For testing, I wanted to create default classes that extend my POJO classes, providing minimal data to meet the various check constraints on the database.

Is there any way to extend a Hibernate annotated class without mapping the subclass?

I could map them, define the inheritance as a table per subclass and insert dummy tables with the primary key, but I'd prefer not adding annotations to the original POJO for the test classes, nor adding to my schema when testing.

The only alternative I've come up with is to define static construction methods, but this wont let me add fields or override methods.

Can you not just create a subclass, but without a @Entity annotation?

I think I don't understand the problem :-)

If you don't add entity mappings, when saving the class the EntityManager will throw an exception since the test class is unmapped.

I wanted it to use the extended mappings; without having to map this class to a table.

See Hibernate documentation for @MappedSuperclass. That's what you want...

Tried that as well. The "Test" class is not an entity, and so cannot be saved.

Generally your superclass is extended by actual entities, which can be saved.

Really is don't clear why you need to extend the pojos to do that.

I does not sounds reasonable, I would create a factory with
all the necessary data for my entities something like this:


public class PojoTestFactory {

public static EntityOne getEntityOne()...
public static EntityTwo getEntityTwo()...
}

In each of this methods I will add the requires fields, and that's so.

Hope it helps
tonio

The factory approach works; but it does stop me from some polymorphic flexibility. I could add a boolean to add trace logging to see when data is changed. But since I can't add variables or extend any mapped class, that wont work.

I guess I'll settle for the factory. It works, I just can't add/override methods as I might have liked.