Deployment.java

vertx.deployVerticle("org.enterpriseintegration.Worker",
	// Instantiate a DeploymentOptions by setting an explicit number
	// of instances and enabling worker code
	new DeploymentOptions().setInstances(instances).setWorker(true), res -> {
		if (res.succeeded()) {
			System.out.println("Worker verticle deployed");

			// Send messages on the event bus
			EventBus eventBus = vertx.eventBus();
			eventBus.publish("event", "event01");
			eventBus.send("event", "event02");
			eventBus.send("event", "event03");
		} else {
			System.out.println("Error while deploying a verticle: " + res.cause().getMessage());
		}
	}
);