This came out of hibernate's test suite, the following tests fail:

• org.hibernate.engine.spi.ExtraStateTest shouldMaintainExtraStateWhenUsingIdentityIdGenerationStrategy
• org.hibernate.id.CreateDeleteTest createAndDeleteAnEntityInTheSameTransactionTest
• org.hibernate.id.FlushIdGenTest testPersistBeforeTransaction

Due to a sequence not existing.

create table ChineseTakeawayRestaurant (
  id  bigserial not null,
  gobelinStars int4 not null,
  primary key (id)
)
insert into ChineseTakeawayRestaurant (gobelinStars) 
  values 3

select currval('ChineseTakeawayRestaurant_id_seq')

Postgres automatically creates a sequence whenever a serial or big serial type is used. We don't do this.