SampleVerticle.java

public class SampleVerticle extends AbstractVerticle {

  private final Logger logger = LoggerFactory.getLogger(SampleVerticle.class);

  @Override
  public void start(Future<Void> startFuture) {
    vertx.createHttpServer()
      .requestHandler(req -> {
        req.response()
          .putHeader("Content-Type", "plain/text")
          .end("Yo!");
        logger.info("Handled a request on path {} from {}", req.path(), req.remoteAddress().host());
      })
      .listen(11981, ar -> {
        if (ar.succeeded()) {
          startFuture.complete();
        } else {
          startFuture.fail(ar.cause());
        }
      });
  }
}