Jean-Francois Fournier ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiOWYzYTIyMmRi... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16492?atlOrigin=eyJpIjoiOWYzYT... ) HHH-16492 ( https://hibernate.atlassian.net/browse/HHH-16492?atlOrigin=eyJpIjoiOWYzYT... ) Hibernate 6 does not auto flush when calling Query.stream() ( https://hibernate.atlassian.net/browse/HHH-16492?atlOrigin=eyJpIjoiOWYzYT... ) Issue Type: Bug Affects Versions: 6.1.7 Assignee: Unassigned Components: hibernate-core Created: 19/Apr/2023 04:29 AM Environment: Hibernate 6.1.7 Java 17 Oracle Sql Priority: Major Reporter: Jean-Francois Fournier ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Calling query.stream() doesn’t auto flush the persistence context. Calling query.list() does flush the persistence context. This seems to be a bug as it was working with both methods in hibernate 5. If we use the exemple found in https://docs.jboss.org/hibernate/orm/6.1/userguide/html_single/Hibernate_... assertTrue((( Number ) entityManager .createNativeQuery( "select count(*) from Person" ) .getSingleResult()).intValue() == 0); Person person = new Person( "John Doe" ); entityManager.persist(person); assertTrue((( Number ) entityManager .createNativeQuery( "select count(*) from Person" ) .getSingleResult()).intValue() == 1); And tweak it a bit to use stream(), it won’t work. (but works in hibernate 5) assertTrue(entityManager .createNativeQuery( "select name from Person where name = 'John Doe' " ) .getResultList().size() == 0); Person person = new Person( "John Doe" ); entityManager.persist(person); assertTrue(entityManager .createNativeQuery( "select name from Person where name = 'John Doe' " ) .getResultStream().toList().size() == 1); But it works if it uses list() instead assertTrue(entityManager .createNativeQuery( "select name from Person where name = 'John Doe' " ) .getResultList().size() == 0); Person person = new Person( "John Doe" ); entityManager.persist(person); assertTrue(entityManager .createNativeQuery( "select name from Person where name = 'John Doe' " ) .getResultList().size() == 1); I look into the source a bit and AbstractSelectionQuery. stream() doesn’t call beforeQuery(); like AbstractSelectionQuery.list() do. So NativeQueryImpl. prepareForExecution() is never called when using stream(). Thank you ( https://hibernate.atlassian.net/browse/HHH-16492#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16492#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#100222- sha1:cb3bdf0 )