Cloud Native Java: Quarkus Overview

1. Introduction

Quarkus is a Kubernetes-native Java framework tailored for GraalVM and OpenJDK HotSpot. It optimizes Java specifically for containers, enabling developers to create lightweight, high-performance microservices and serverless applications.

2. Key Concepts

3. Installation

To get started with Quarkus, follow these steps:

1. Install Java 11 or later.
2. Download the Quarkus CLI from the Quarkus website.
3. Set up your environment by adding Quarkus to your PATH.

4. Creating a Quarkus App

Follow these steps to create a simple RESTful service:

            # Create a new Quarkus project
            mvn io.quarkus:quarkus-maven-plugin:2.7.0:create \
                -DprojectGroupId=com.example \
                -DprojectArtifactId=my-quarkus-app \
                -DclassName="com.example.GreetingResource" \
                -Dpath="/greet"
        

Your project structure will be generated, and you can find the main class inside src/main/java/com/example/GreetingResource.java:

        package com.example;

        import javax.ws.rs.GET;
        import javax.ws.rs.Path;
        import javax.ws.rs.Produces;
        import javax.ws.rs.core.MediaType;

        @Path("/greet")
        public class GreetingResource {

            @GET
            @Produces(MediaType.TEXT_PLAIN)
            public String greet() {
                return "Hello, Quarkus!";
            }
        }
        

4.1 Running the Application

To run the application, navigate to your project directory and execute:

            ./mvnw quarkus:dev
        

You can access the application at http://localhost:8080/greet.

5. Best Practices

• Utilize Quarkus extensions to enhance functionality.
• Keep dependencies minimal to reduce the application size.
• Leverage the configuration system for externalized configurations.
• Use the Dev Mode for rapid development cycles.

6. FAQ