HHH-16627 Duplicate records being created for many-to-many relation implemented as two one-to-many relations with cascading + HHH-16628 Two transactions within the same session cause unsaved transient instance error

[dreab8]

https://hibernate.atlassian.net/browse/HHH-16627

https://hibernate.atlassian.net/browse/HHH-16628

[dreab8]

Hi@sebersole, I found a problem that my solution does not fix, given:

Student s1 = session.createQuery( "from Student where name = :name", Student.class )
							.setParameter( "name", STUDENT_NAME ).uniqueResult();

Course c1 = session.createQuery( "from Course where name = :name", Course.class )
							.setParameter( "name", COURSE_1_NAME ).uniqueResult();

Enrollment e1 = new Enrollment( 10 );

s1.addEnrollment( e1 );

c1.addEnrollment( e1 );

Student mergedStudent = session.merge( s1 );
Course mergedCourse = session.merge( c1 );

the second merge trigger the persist of a second Enrollment , working on this and I'll check also if we can clear the mergedEntities after flush().

Thanks for looking at it!