Hi Andrei,

you're right, here
https://github.com/hibernate/hibernate-orm/blob/5.0/migration-guide.adoc
it says:

Default value for hibernate.id.new_generator_mappings setting changed to true for 5.0. See org.hibernate.cfg.AvailableSettings#USE_NEW_ID_GENERATOR_MAPPINGS javadocs.

Seems like a typical RTFM-case then
Thank you!

Matthias