Marius K ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=70121%3... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiZTFjYTM5NWVj... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16437?atlOrigin=eyJpIjoiZTFjYT... ) HHH-16437 ( https://hibernate.atlassian.net/browse/HHH-16437?atlOrigin=eyJpIjoiZTFjYT... ) class org.hibernate.mapping.BasicValue cannot be cast to class org.hibernate.mapping.ToOne ( https://hibernate.atlassian.net/browse/HHH-16437?atlOrigin=eyJpIjoiZTFjYT... ) Issue Type: Bug Affects Versions: 6.2.0.CR4, 6.2.0 Assignee: Unassigned Attachments: hibernate-orm-6.zip, image-20230405-073033.png Components: hibernate-core Created: 05/Apr/2023 00:34 AM Priority: Major Reporter: Marius K ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=70121%3... ) Hi, I have a One-To-Many relation with the Many-entity having an composite id with AttributeOverrides. This works fine with 6.2.0-CR3 and starts failing with CR4. java.lang.ClassCastException: class org.hibernate.mapping.BasicValue cannot be cast to class org.hibernate.mapping.ToOne (org.hibernate.mapping.BasicValue and org.hibernate.mapping.ToOne are in unnamed module of loader 'app') I attached a test case. hibernate-orm-6.zip ( https://hibernate.atlassian.net/secure/attachment/50293/50293_hibernate-o... ) @Entity public class Contract implements Serializable { private static final long serialVersionUID = 1L; @Id private Integer contractId; @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "id.contractId") @OrderBy(value = "id.positionNumber") private List<Contractposition> contractpositions = new ArrayList<>(); @Entity public class Contractposition implements Serializable { private static final long serialVersionUID = 1L; @EmbeddedId @AttributeOverrides( { @AttributeOverride(name = "contractId", column = @Column(name = "VERTRAG_ID", nullable = false)), @AttributeOverride(name = "positionNumber", column = @Column(name = "POSITIONSNUMMER", nullable = false))}) private ContractpositionId id; @Embeddable public class ContractpositionId implements Serializable { private static final long serialVersionUID = 1L; @Column(name = "VERTRAG_ID", nullable = false) private Integer contractId; @Column(name = "POSITIONSNUMMER", nullable = false) private int positionNumber; Debugging shows: ( https://hibernate.atlassian.net/browse/HHH-16437#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16437#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#100221- sha1:78e8bd6 )