Vertx hello world

MainVerticle.java

 public class MainVerticle extends AbstractVerticle
{

 
   @Override
    public void start(Promise<Void> startPromise) throws Exception {

        Router router = Router.router(vertx);
        router.get("/hello").handler(this::hello);

        vertx.createHttpServer().requestHandler(router).listen(8882, http -> {
            if (http.succeeded()) {
                startPromise.complete();
                System.out.println("HTTP server started on port 8882");
            } else {
                startPromise.fail(http.cause());
            }
        });
    }
    
    
   private void hello(RoutingContext routingContext) {
        routingContext.response()
                .putHeader("content-type", "text/plain")
                .end("Hello from Vert.x!");
    }
}