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 JoinTablewithout 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?