code: public void order() {
          final OrderComparator comparator = new OrderComparator();
          for (Class<? extends FeatureInstaller> installer : installerTypes) {
              if (Ordered.class.isAssignableFrom(installer)) {
                  final List<Class<?>> extensions = this.extensions.get(installer);
                  if (extensions == null || extensions.size() <= 1) {
                      continue;
                  }
                  extensions.sort(comparator);
              }
          }
      }
docs: Order extension according to {@link ru.vyarus.dropwizard.guice.module.installer.order.Order} annotation.
  Installer must implement {@link ru.vyarus.dropwizard.guice.module.installer.order.Ordered} otherwise
  no order appear.