Ilya Ryzhov ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5f65f49... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNmVmOTk5NjAw... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-17012?atlOrigin=eyJpIjoiNmVmOT... ) HHH-17012 ( https://hibernate.atlassian.net/browse/HHH-17012?atlOrigin=eyJpIjoiNmVmOT... ) Using CriteriaBuilder not method mutates original predicate in SQL ( https://hibernate.atlassian.net/browse/HHH-17012?atlOrigin=eyJpIjoiNmVmOT... ) Change By: Ilya Ryzhov ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5f65f49... ) Using CriteriaBuilder’s not() with predicate or Predicate’s not() generates negated original SQL-predicate. Entity class: {noformat}@Entity @Table(name = "some_table") class SomeEntity( @Id @GeneratedValue(generator = "some_id_seq") @SequenceGenerator(name = "some_id_seq", sequenceName = "some_id_seq", allocationSize = 1) @Column(name = "id") val id: Int? = null, @Column(name = "name") var name: String? = null, ){noformat} Specification producing wrong SQL: {noformat}someEntityRepository.findAll { root, _, cb -> val predicate = cb.isNull(root[SomeEntity_.name]) val negation = cb.not(predicate)//same with predicate.not() cb.and(predicate, negation) }{noformat} SQL generated in 6.2.5.Final: {code:sql}select s1_0.id, s1_0.name from some_table s1_0 where s1_0.name is not null and s1_0.name is not null{code} SQL generated in 5.6.15.Final: {code:sql}select someentity0_.id as id1_56_, someentity0_.name as name2_56_ from distributor_test. some_table someentity0_ where ( someentity0_.name is null ) and ( someentity0_.name is not null ){code} Maybe I missed something in release notes and migration guides, but it looks like a unintended behavior. ( https://hibernate.atlassian.net/browse/HHH-17012#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-17012#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#100233- sha1:da16c62 )