Andrea Boriero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-15999 ( https://hibernate.atlassian.net/browse/HHH-15999?atlOrigin=eyJpIjoiNWE1MW... ) Re: Hibernate 6.1.6.Final TableGenerator produces negative ID's ( https://hibernate.atlassian.net/browse/HHH-15999?atlOrigin=eyJpIjoiNWE1MW... ) I checked your reproducer and I saw you are creating an hibernate_sequance table with an auto increment column name id , Hibernate is not aware of this column but instead expects a table with 2 columns, sequence_name that is a Primary key and next_val. ( https://hibernate.atlassian.net/browse/HHH-15999#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15999#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#100214- sha1:fcee39f )