Christian Thiel ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=712020%... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNjliYmM4MGE2... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16791?atlOrigin=eyJpIjoiNjliYm... ) HHH-16791 ( https://hibernate.atlassian.net/browse/HHH-16791?atlOrigin=eyJpIjoiNjliYm... ) EntitManager find with IdClass returns null ( https://hibernate.atlassian.net/browse/HHH-16791?atlOrigin=eyJpIjoiNjliYm... ) Change By: Christian Thiel ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=712020%... ) I have an entity with a composite primary key like this: { noformat code:java }(a)IdClass(MyEntityKey.class) public class MyEntity { @Id private Long id; @Id private OffsetDateTime bookDate; private String data; } { noformat code } and the ID-Class { noformat code:java }public class MyEntityKey implements Serializable { private Long id; private OffsetDateTime bookDate; } { noformat code } After upgrading from hibernate-core from 6.2.1 to 6.2.4 (actually upgrade from Quarkus 3.0.3 to 3.1.1) the {{em.find()}} no longer works, but returns `null: { noformat code:java }em.find(MyEntity.class, new MyEntityKey(ID, BOOK_DATE)); //returns null { noformat code } but the same as a query works: { noformat code:java }em .createQuery("SELECT x FROM MyEntity x WHERE x.id = :id AND x.bookDate = :bookDate", MyEntity.class) .setParameter("id", ID) .setParameter("bookDate", BOOK_DATE) .getResultList(); //returns the value { noformat code } I was not able to reproduce this with a [JPAUnitTestCase|https://github.com/hibernate/hibernate-test-case-template...], see [discourse|https://discourse.hibernate.org/t/find-idclass-not-working/7804]. ( https://hibernate.atlassian.net/browse/HHH-16791#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16791#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#100226- sha1:c25eebb )