Jan Schatteman ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-16249 ( https://hibernate.atlassian.net/browse/HHH-16249?atlOrigin=eyJpIjoiYzJlMz... ) Re: StatelessSession does not flush when using jdbc batch_size > 1 ( https://hibernate.atlassian.net/browse/HHH-16249?atlOrigin=eyJpIjoiYzJlMz... ) The original issue you are referring to stated that the ‘last round of statements’ didn’t get flushed to the DB. For this to happen, the inserts need to be inside in a transaction opened by the stateless session , so it’s my understanding that there is in fact no bug here? ( https://hibernate.atlassian.net/browse/HHH-16249#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16249#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:f4229d0 )