Gavin King ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiMTI5MTQ2MGU5... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16463?atlOrigin=eyJpIjoiMTI5MT... ) HHH-16463 ( https://hibernate.atlassian.net/browse/HHH-16463?atlOrigin=eyJpIjoiMTI5MT... ) @PrimaryKeyJoinColumn ignored for @OneToOne mappings ( https://hibernate.atlassian.net/browse/HHH-16463?atlOrigin=eyJpIjoiMTI5MT... ) Issue Type: Bug Assignee: Unassigned Components: hibernate-core Created: 12/Apr/2023 04:19 AM Priority: Major Reporter: Gavin King ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Given the following mapping: @OneToOne @MapsId @PrimaryKeyJoinColumn(name = "id" ) //ignored! private User user; The column name is simply ignored. There are two possible workarounds: * Remove @MapsId and add optional=false : @OneToOne(optional = false ) @PrimaryKeyJoinColumn(name = "id" ) private User user; * Use @JoinColumn instead of @PrimaryKeyJoinColumn @OneToOne @MapsId @JoinColumn(name = "id" ) But my reading of the JPA spec is that the first example should work. ( https://hibernate.atlassian.net/browse/HHH-16463#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16463#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:c4871f2 )