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Hibernate/jpa: do I have to "re-attach"

 
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Hi,
I'm using JPA with Hibernate implementation (but a solution on classic Hibernate would also be appreciated).
It's a Many-to-Many unidirectional relation, say between "Course" and "Student" (code below).
My problem is saving a Student when his Courses list is detached. I'm sure each such course is already saved in the database and has proper ID... so I wanted to just update the JoinTable without wasting performance on checking the existence of each course. I could do it easily with raw JDBC. But if I use Hibernate, it forces me to check and "re-attach" the courses (re-attaching is either through CASCADE, or re-selecting the courses).


Is there a way to tell Hibernate to "just trust me &update the JoinTable (linking this studentID to those courseIDs), without reattaching/validating each course?

Thanks
 
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