registrations.execute(new PolymorphicNamedEntityInstantiator<I>() {
                    @Override
                    public Set<? extends Class<? extends I>> getCreatableTypes() {
                        return instantiator.getCreatableTypes();
                    }

                    @Override
                    public <U extends I> void registerFactory(Class<U> type, NamedDomainObjectFactory<? extends U> factory) {