IT Support ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiN2E3MDE1OWE4... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-13939?atlOrigin=eyJpIjoiN2E3MD... ) HHH-13939 ( https://hibernate.atlassian.net/browse/HHH-13939?atlOrigin=eyJpIjoiN2E3MD... ) H2Dialect @GeneratedValue regression on schema generation, uses sequence instead of generated by default as identity ( https://hibernate.atlassian.net/browse/HHH-13939?atlOrigin=eyJpIjoiN2E3MD... ) Change By: IT Support ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) In Hibernate 4.x, specifically 4.3.11 , all worked as expected. {code:xml|title= * persistence.xml snippet } * {code:xml} <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" /> <property name="hibernate.hbm2ddl.auto" value="create-drop" /> <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:unittests" /> {code} {code:sql|title= * 4.x generated SQL } * Hibernate {code : sql} create table dbo.office (officeid bigint generated by default as identity, office varchar(255) not null, description varchar(255), sequence varchar(255), orgid bigint not null, primary key (officeid)) {code} {code:sql|title= In 5.x the DB structure has changed in incompatible ways. *5.x generated SQL } * {code:sql} create table dbo.office (officeid bigint not null, office varchar(255) not null, description varchar(255), sequence varchar(255), orgid bigint not null, primary key (officeid)) create sequence hibernate_sequence start with 1 increment by 1 {code} I have confirmed the dialect values are sensible. The error seems to be inside / around the {{ SessionFactoryImpl }} 's {{ identifierGenerators }} . While the dialect indicates Identity generation, the generator seems to be a result of {{ DefaultIdentifierGeneratorFactory }} , which produces sequence based ids. Specifically the {{ metadata.getEntityBindings() }} returns a {{ PersistentClass }} model where the identifier is a {{ SimpleValue }} whose {{ identifierGenerator }} is a {{ SequenceStyleGenerator }} . This can be backtracked to: *EntityManagerFactoryBuilderImpl* {code:java |title=EntityManagerFactoryBuilderImpl } private MetadataImplementor metadata() { if ( this.metadata == null ) { this.metadata = MetadataBuildingProcess.complete( managedResources, metamodelBuilder.getMetadataBuildingOptions() ); } return metadata; } {code} This is not related to: * [ HHH-13727 ] * [ HHH-13597 ] ( https://hibernate.atlassian.net/browse/HHH-13939#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-13939#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#100124- sha1:c13ca0d )