code: public static <T> T getInstance(Class<T> clazz) {
          Objects.requireNonNull(clazz, Required.CLASS.toString());
  
          return injector.getInstance(clazz);
      }
docs: Short form for getting an Goolge Guice injected class by
  calling getInstance(...)
  
  @param clazz The class to retrieve from the injector
  @param <T> JavaDoc requires this (just ignore it)
  
  @return An instance of the requested class