Jones ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-15772 ( https://hibernate.atlassian.net/browse/HHH-15772?atlOrigin=eyJpIjoiZDVlNj... ) Re: deprecate @Target, @Proxy, @Polymorphism ( https://hibernate.atlassian.net/browse/HHH-15772?atlOrigin=eyJpIjoiZDVlNj... ) Given the following snippet: List<MyEntity> entities = query.list(); for (MyEntity entity : entities) { // some business logic for (OtherEntity relatedEntity : entity.getRelationshipEntities() /* polymorphic */ ) { if (relatedEntity instanceof ConcreteEntityOne) { // this instanceof doesn't work because sometimes it could be a proxy // do something } } } That will need to be changed to something like: List<MyEntity> entities = query.list(); for(MyEntity entity : entities) { // some business logic for (OtherEntity relatedEntity : entity.getRelationshipEntities() /* polymorphic */) { OtherEntity unproxiedRelatedEntity = Hibernate.unproxy(relatedEntity); if (unproxiedRelatedEntity instanceof ConcreteEntityOne) { // this instanceof doesn't work because sometimes it could be a proxy // do something } } } To avoid such thing being spread all over the place, then the only other way would be to have a hibernate listener that will unproxy the loaded entity and it will be in a single place… So, if I’m initializing a collection of a polymorphic entity, I’ll need to unproxy its elements. ( https://hibernate.atlassian.net/browse/HHH-15772#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15772#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#100217- sha1:45db922 )