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3.2. Obtaining a SessionFactory

When all mappings have been parsed by the org.hibernate.cfg.Configuration, the application must obtain a factory for org.hibernate.Session instances. This factory is intended to be shared by all application threads: 
SessionFactory sessions = cfg.buildSessionFactory();
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Hibernate does allow your application to instantiate more than one org.hibernate.SessionFactory. This is useful if you are using more than one database.
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