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Hibernate version:3.1.2

Mapping documents:

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

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Read this: http://hibernate.org/42.html
I get a exception when develop a application with hibernate3.1.2 -- A collection with cascade="all-delete-orphan" was no longer referenced by the owning entity instance: com.spotlight.model.Subject.childSubjects ;

this case only happen where unit test class in the package [com.spotlight.dao.]
the natural unit test for other package

can you talk me why?
thanks
xyh

Have a look at:

http://www.hibernate.org/117.html#A2