As any snippet (existing ones) this one is also static void main(String[] args)... so are runnable classes, and their purpose is really just to showcase how to use Resolver. The other demos that are shorter do run during build as part of AllResolverDemosTest (multiple times, with SL, Guice, Sisu, supplier), we did this long time ago, to make sure that Guice module and SL and supplier are "complete", we had some bugs in 1.8 or early 1.9 where we forgot to add new components to Guice module or SL and later we got feedback about it.

The Javadoc on this class IMO tells enough: is meant for ad-hoc experimenting.