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Hibernate version: 3.2

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

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Connection is provided by c3p0 connection pool version 0.9.

i create a SessionFactory, and create many Session objects,and close all of them except one, When i create the SessionFactory second time because of java entity class changed,i find that the un-close session create used the first SessionFactory with the SessionFactory not gc,
the SessionFactoryImpl is not gc because the un-closed Session references it ,but which object reference the Session?

can some one tell me the reason

no one knows?