Github has been down for a while, so moving to mailing list. JPA 2 spec 2.4.1.3 Examples of Derived Identities, Case (a): The dependent entity uses IdClass to represent a composite key: ``` public class DependentId { String name; // matches name of @Id attribute long emp; // matches name of @Id attribute and type of Employee PK } @Entity @IdClass(DependentId.class) public class Dependent { @Id String name; // id attribute mapped by join column default @Id @ManyToOne Employee emp; ... } ``` HeadS is the Entity type and its Id type is Long. I backed out the changes to SimpleValue.java/AbstractEntityTuplizer.java and changed the IdClasses to match and it does pass the tests in Hibernate. But when testing 2.4.1.3, case a without the patch the following tests fails: - testCompositePkWithIdentityAndFKByAuto: No part of a composite identifier may be null - testCompositePkWithIdentityAndFKByAuto2: No part of a composite identifier may be null - testCompositePkWithIdentityAndFKBySequence: No part of a composite identifier may be null - testCompositePkWithIdentityAndFKBySequence2: No part of a composite identifier may be null - testCompositePkWithIdentityAndFKByTable: No part of a composite identifier may be null - testCompositePkWithIdentityAndFKByTable2: No part of a composite identifier may be null These tests are expected to fail / ignored: - testCompositePkWithIdentityAndFKByIdentity: No part of a composite identifier may be null - testCompositePkWithIdentityAndFKByIdentity2: skipped -Jason — You are receiving this because you were mentioned. Reply to this email directly, https://github.com/hibernate/hibernate-orm/pull/3368#issuecomment-618352419, or https://github.com/notifications/unsubscribe-auth/AAQUDIQWBZ5E4INWC5ELIZ3....