Adrian Cox ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=60e7210... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNmEwZGMxZjkx... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16002?atlOrigin=eyJpIjoiNmEwZG... ) HHH-16002 ( https://hibernate.atlassian.net/browse/HHH-16002?atlOrigin=eyJpIjoiNmEwZG... ) JPQL queries failing through composite key ( https://hibernate.atlassian.net/browse/HHH-16002?atlOrigin=eyJpIjoiNmEwZG... ) Issue Type: Bug Affects Versions: 5.4.0, 5.6.14 Assignee: Unassigned Created: 08/Jan/2023 08:49 AM Environment: Hibernate 5.6.14, Java 11, Windows 10 Priority: Major Reporter: Adrian Cox ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=60e7210... ) Hibernate 5.6 generates incorrect SQL for JPQL queries involving an `@IdClass` mapping. The test case is here: https://github.com/AdrianAtHumboldt/hibernate-test-case-idclass ( https://github.com/AdrianAtHumboldt/hibernate-test-case-idclass ) The tests pass with Hibernate 5.3.27, but fail for 5.4.0 through to 5.6.14. There are two likely related failures - in the first failure the expected parameter type has changed for a query. In the query `select x from EntityX x where x.link.attribute = ?1 and x.link.s = ?2` Parameter type 2 is now expected to be long, which is the primary key of S. In the second failure the wrong SQL is generated for the query `select x from EntityX x where x.link.attribute = ?1 and x.link.s.id = ?2`. The final line is a test on x.id instead of on x.link.s.id. select entityx0_.id as id1_2_, entityx0_.link_entitys_id as link_ent2_2_, entityx0_.link_entityv_id as link_ent3_2_ from EntityX entityx0_ cross join Link link1_ where entityx0_.link_entitys_id=link1_.entitys_id and entityx0_.link_entityv_id=link1_.entityv_id and link1_. attribute =? and entityx0_.id=? ( https://hibernate.atlassian.net/browse/HHH-16002#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16002#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#100213- sha1:f908df2 )