What is Vertx?

Introduction to Vert.x

Vert.x is a polyglot event-driven application framework that runs on the Java Virtual Machine (JVM). It is designed for building scalable, responsive, and high-performance applications. Vert.x takes the best ideas from Event-Driven Architecture (EDA), Asynchronous Programming, and Reactive Programming, making it an excellent choice for microservices, web applications, and real-time systems.

Key Features of Vert.x

  1. Polyglot: Supports multiple programming languages including Java, JavaScript, Groovy, Ruby, and Kotlin.
  2. Event-Driven: Uses a non-blocking, event-driven architecture for high scalability.
  3. Asynchronous: Built-in support for asynchronous programming, enabling better resource utilization.
  4. Modular: Provides a modular architecture that allows you to pick and choose the components you need.
  5. Reactive: Supports the reactive programming model for building responsive and resilient applications.
  6. High Performance: Designed for high performance and low latency.

Setting Up Vert.x

Before diving into the example, make sure you have the following prerequisites:

  • Java Development Kit (JDK) 8 or higher
  • Maven (for building the project)
  • An IDE like IntelliJ IDEA or Eclipse (optional but recommended)

Simple Example: Hello World with Vert.x

Let’s create a simple “Hello World” application using Vert.x. This example will demonstrate how to set up a basic HTTP server that responds with “Hello, Vert.x!” when accessed.

Step 1: Create a Maven Project

Create a new Maven project and add the following dependencies to your pom.xml file:

Step 2: Create the Main Verticle

In Vert.x, a “Verticle” is a component that encapsulates a unit of deployment. Create a Java class HelloWorldVerticle:

Step 3: Run the Application

Compile and run the application using your IDE or the command line. If using the command line, navigate to the project directory and run:

Step 4: Test the Application

Open your browser and navigate to http://localhost:8888. You should see the message “Hello, Vert.x!”.


This simple example demonstrates the basics of creating an HTTP server using Vert.x. Vert.x offers a lot more features and flexibility, allowing you to build robust and scalable applications. Explore the official Vert.x documentation to learn more about its capabilities and advanced features.