code: public static boolean isAvailable() {
          return isAvailable(ReactiveLibrary.PROJECT_REACTOR) || isAvailable(ReactiveLibrary.RXJAVA1)
                  || isAvailable(ReactiveLibrary.RXJAVA2);
      }
docs: Returns {@literal true} if reactive support is available. More specifically, whether RxJava1/2 or Project Reactor
  libraries are on the class path.
  
  @return {@literal true} if reactive support is available.