vertx kotlin MainVerticle

package com.example.starter

import io.vertx.core.AbstractVerticle
import io.vertx.core.Promise
import io.vertx.ext.web.Router
import io.vertx.kotlin.core.json.json
import io.vertx.kotlin.core.json.obj

class MainVerticle : AbstractVerticle() {

  override fun start(startPromise: Promise<Void>) {

    val router = Router.router(vertx);

    router.get("/api").handler { ctx ->
      val address = ctx.request().remoteAddress().toString();
      val params = ctx.request().params();
      val query = ctx.request().query();

      val queryParams = ctx.queryParams();
      val name = queryParams.get("name") ?: "unknown";

      ctx.json(
        json {
          obj(
            "name" to name,
            "address" to address
          )
        }
      )
    }

    vertx
      .createHttpServer()
      .requestHandler(router)
      .listen(8888)
      .onSuccess{ server ->
        println("Server is running on port: ${server.actualPort()}")
      }
  }
}