Message Title

In this project we have entities with composite keys: looks like the problem is related to using @IdClass with derived identities.

After saving 3 objects (which are correctly written to the database), the subsequent select for the same rows mixes up the JoinColumns and, forcing a flush, throws the following exception:

org.springframework.orm.jpa.JpaSystemException: identifier of an instance of net.brunomendola.demo.spring.jpa.compositepkwithrelationships.model.ProfileAction was altered from ProfileActionPK(profile=PR1, action=ActivityActionPK(activity=AT1, subId=AT1)) to ProfileActionPK(profile=PR1, action=ActivityActionPK(activity=AT1, subId=1)); nested exception is org.hibernate.HibernateException: identifier of an instance of net.brunomendola.demo.spring.jpa.compositepkwithrelationships.model.ProfileAction was altered from ProfileActionPK(profile=PR1, action=ActivityActionPK(activity=AT1, subId=AT1)) to ProfileActionPK(profile=PR1, action=ActivityActionPK(activity=AT1, subId=1))
	at net.brunomendola.demo.spring.jpa.compositepkwithrelationships.SpringJpaCompositePkWithRelationshipsApplicationTests.testCreateProfileActions(SpringJpaCompositePkWithRelationshipsApplicationTests.java:56)
Caused by: org.hibernate.HibernateException: identifier of an instance of net.brunomendola.demo.spring.jpa.compositepkwithrelationships.model.ProfileAction was altered from ProfileActionPK(profile=PR1, action=ActivityActionPK(activity=AT1, subId=AT1)) to ProfileActionPK(profile=PR1, action=ActivityActionPK(activity=AT1, subId=1))
	at net.brunomendola.demo.spring.jpa.compositepkwithrelationships.SpringJpaCompositePkWithRelationshipsApplicationTests.testCreateProfileActions(SpringJpaCompositePkWithRelationshipsApplicationTests.java:56)

Since the cause is a HibernateException, I'm supposing it's a hibernate-core issue; correct me if I'm wrong.

In the repo there are 2 more branches in which the test passes successfully, switching to @EmbeddedId or @IdClass with simple types.
But I know it should work also with @IdClass and derived identities, since there are related tests in spring-data-jpa repository.

I'm trying to map an existing database, so I don't have any freedom regarding the schema.