Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiOGIxZjAxMjBi... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-17075?atlOrigin=eyJpIjoiOGIxZj... ) HHH-17075 ( https://hibernate.atlassian.net/browse/HHH-17075?atlOrigin=eyJpIjoiOGIxZj... ) Lazy loading of association with non-PK referencedColumnName always yields null when bytecode enhancement is enabled ( https://hibernate.atlassian.net/browse/HHH-17075?atlOrigin=eyJpIjoiOGIxZj... ) Issue Type: Bug Assignee: Unassigned Components: hibernate-core Created: 14/Aug/2023 02:40 AM Fix Versions: 6.3.0, 6.2.8 Priority: Major Reporter: Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) With the model below, and with bytecode enhancement enabled, calling EntityB#getMyAssociation will always yield a null value, even if the association is supposedly non-`null`. I’ll send a PR with a reproducer. @Entity(name = "entitya") public static class EntityA { @Id private Integer id; @Column(unique = true) private String myUniqueKey; protected EntityA() { } public EntityA(Integer id) { this.id = id; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getMyUniqueKey() { return myUniqueKey; } public void setMyUniqueKey(String myUniqueKey) { this.myUniqueKey = myUniqueKey; } } @Entity(name = "entityb") public static class EntityB { @Id private Integer id; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "myForeignKey", referencedColumnName = "myUniqueKey") private EntityA myAssociation; protected EntityB() { } public EntityB(Integer id) { this.id = id; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public EntityA getMyAssociation() { return myAssociation; } public void setMyAssociation(EntityA myAssociation) { this.myAssociation = myAssociation; } } ( https://hibernate.atlassian.net/browse/HHH-17075#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-17075#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#100234- sha1:d099d86 )