def metadata = new MetadataSources(
    new StandardServiceRegistryBuilder().build()).buildMetadata()
def schemaExport = new SchemaExport()
schemaExport.create(EnumSet.of(TargetType.DATABASE), metadata)

hibernate.dialect = <my_dialect>
hibernate.connection.driver_class = <my_driver>
hibernate.connection.url = <my_url>
hibernate.connection.username = <my_username>
hibernate.connection.password = <my_password>
hibernate.hbm2ddl.auto = validate
hibernate.show_sql = true
hibernate.format_sql = true    <------- NO EFFECT!