11.5.6. The Bootstrap Registry About the Boot-strap Registry

The boot-strap registry holds services that absolutely have to be available for most things to work. The main service here is the ClassLoaderService which is a perfect example. Even resolving configuration files needs access to class loading services (resource look ups). This is the root registry (no parent) in normal use.
Instances of boot-strap registries are built using the org.hibernate.service.BootstrapServiceRegistryBuilder class.