Markus Haarländer ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=63ef997... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiODAxMTMyOWFh... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16197?atlOrigin=eyJpIjoiODAxMT... ) HHH-16197 ( https://hibernate.atlassian.net/browse/HHH-16197?atlOrigin=eyJpIjoiODAxMT... ) Circular References of the same entity result in different Java Objects when caching enabled and using a query ( https://hibernate.atlassian.net/browse/HHH-16197?atlOrigin=eyJpIjoiODAxMT... ) Change By: Markus Haarländer ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=63ef997... ) We switched from Hibernate 5 to 6 and observed a strange behaviour: hibernate 6.1.7 hibernate-jcache 6.1.7 ehcache 3.10.8 Model with a circular reference: Child(id=c1) -> Parent (id=p1) -> Child(id=c1) When using an EntityManager to find the Child with id=c1, everything is fine. Child result = entityManager.find(Child.class, "c1"); The returned result is the same object as the one in result.getParent().getChild(). However, when using a simple query like: Child result = entityManager.createQuery("SELECT child from Child child WHERE child.objectId = 'c1'", Child.class).getSingleResult(); The returned result is a different Java Object than the one in result.getParent().getChild() This leads to huge problems. Please find a testcase here: [ https://github.com/haarli/hibernate-orm-6 |https://github.com/haarli/hibernate-orm-6] (However, in this test case environment it is not even possible to execute the Query, although it's correct. so there might be an additional bug here. ) If you set "hibernate.cache.use_second_level_cache" to false, everything works fine Thank you for any help. ( https://hibernate.atlassian.net/browse/HHH-16197#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16197#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100217- sha1:d96fecc )