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Hibernate version:2.1.3

Mapping documents:

Code between sessionFactory.openSession() and session.close():

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in the "hibernate in acton" 's application caveatemptor,
i create 2 catalog ,one is parent of another , and they
belong to my new class 's property catalogs :
Class myclass {
Set catalogs=new HashSet();
}
i use myclass.catalogs.add(catalogs) to add them , i want to know
which one was first sent to database ??