Implementation PingVerticle as provided by Vert.x as an example for integration testing. (See https://github.com/vert-x/vertx-maven)

PingVerticle.java

/*
This is a simple Java verticle which receives `ping` messages on the event bus and sends back `pong` replies
 */
public class PingVerticle extends Verticle {

  public void start() {

    vertx.eventBus().registerHandler("ping-address", new Handler<Message<String>>() {
      @Override
      public void handle(Message<String> message) {
        message.reply("pong!");
        container.logger().info("Sent back pong");
      }
    });

    container.logger().info("PingVerticle started");
  }
}