The intention was to pick it up from org.hibernate.boot.spi.SessionFactoryOptions#getValidatorFactoryReference primarily falling back to ConfigurationService, before defaulting to building our own.

I asked Scott Marlow in email to verify that SessionFactoryOptions#getValidatorFactoryReference is populated properly when we get into TypeSafeActivator#activate. Its should be, but would like to make sure. Then the change is to simply look there first in TypeSafeActivator#activate.