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org.hibernate.NonUniqueObjectException

 
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Hi all, when I started to use relationships, it ends up with different types of exceptions.. please give tell me what is key element and why index as the element in list ?

am using 3 tables..
student (studID primary key),courses(courseID primary key) and student-course(studID and courseID as columns )..

the student can select different courses.

so one student with


mapping file..

when I call session.save(obj).. then
 
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