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Hibernate Session Problemi: Illegal attempt to associate a collection with two open sessions

BTSoru.com projesini modellerken aşağıdaki hata ile karşılaştım:

org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions
at bt.btsoru.application.manager.question.facade.QuestionManagerImpl.addQuestion(QuestionManagerImpl.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

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