Karthik Udayakumar ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5f1ae73... ) *commented* on HHH-13359 ( https://hibernate.atlassian.net/browse/HHH-13359?atlOrigin=eyJpIjoiZDQxNj... ) Re: Issue concerning @OneToOne, @MapsId and cascade persisting ( https://hibernate.atlassian.net/browse/HHH-13359?atlOrigin=eyJpIjoiZDQxNj... ) I am also facing the same issue in Hibernate 5.3.7 . I have observed that this issue is reproducible only if the key type is a non primitive type. ( https://hibernate.atlassian.net/browse/HHH-13359#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-13359#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#100140- sha1:5d840a8 )