jschauder ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=61eece9... ) *commented* on HHH-16054 ( https://hibernate.atlassian.net/browse/HHH-16054?atlOrigin=eyJpIjoiZDdmNT... ) Re: JPA / Hibernate, duplicate pkey error when updating entity that is a subclass of a base class that uses IdClass for composite primary key ( https://hibernate.atlassian.net/browse/HHH-16054?atlOrigin=eyJpIjoiZDdmNT... ) Further investigation showed that the problem occurs only when the two merge calls happen in separate transactions. See https://github.com/gregturn/spring-data-jpa-id-class-issues/pull/1 ( https://github.com/gregturn/spring-data-jpa-id-class-issues/pull/1 ) ( https://hibernate.atlassian.net/browse/HHH-16054#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16054#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#100214- sha1:01e0849 )