When I use the @CreationTimestamp or @UpdateTimestamp in an embeddable java throws exception:

javax.persistence.PersistenceException: Unable to build Hibernate SessionFactory

…which is caused by:
Caused by: org.hibernate.cfg.NotYetImplementedException: Still need to wire in composite in-memory value generation

I’ve tried with both Hibernate ORM 5.1, 5.2, and 5.3 with the same results. Does anybody know if this is a reported bug or are those annotations not supported?