Laurent Almeras ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNDE2ZDRkZmY1... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16641?atlOrigin=eyJpIjoiNDE2ZD... ) HHH-16641 ( https://hibernate.atlassian.net/browse/HHH-16641?atlOrigin=eyJpIjoiNDE2ZD... ) @OrderColumn fails for a generic collection with NPE on XProperty.getMapKey() ( https://hibernate.atlassian.net/browse/HHH-16641?atlOrigin=eyJpIjoiNDE2ZD... ) Issue Type: Bug Affects Versions: 6.2.3 Assignee: Unassigned Components: hibernate-entitymanager Created: 19/May/2023 06:15 AM Environment: JVM 17 / Linux / h2 / postgresql I think it is environment independant. Priority: Major Reporter: Laurent Almeras ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) @OrderColumn on a generic collection type fails at entityManagerFactory startup with a NPE : Caused by: java.lang.NullPointerException: Cannot invoke "org.hibernate.annotations.common.reflection.XClass.getName()" because the return value of "org.hibernate.annotations.common.reflection.XProperty.getMapKey()" is null at org.hibernate.boot.model.internal.ClassPropertyHolder$1.doSecondPass(ClassPropertyHolder.java:312) at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1846) at org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1803) Collection declaration : (in abstract ) ... @OneToMany(mappedBy= "withGeneric" ) @OrderColumn public List<T> targets; ... Generic type is setup in concrete class. This pattern used to work with Hibernate (works for Hibernate 5.6.15, and previous versions). A minimal test-case based on https://github.com/hibernate/hibernate-test-case-templates is coming. There is an existing ticket already open with a similar error https://hibernate.atlassian.net/browse/HHH-16562 but : * it does not imply a generic collection * my minimal test case shows that a non-generic @OneToMany collection is OK I’ll post my github repository with a minimal test-case in a few minutes. ( https://hibernate.atlassian.net/browse/HHH-16641#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16641#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#100225- sha1:9dd72a2 )