How to Build a Microservice with Java and Quarkus (From Zero to Native)

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Spring Boot has dominated the enterprise Java landscape for years. But in the era of cloud-native computing, AWS Lambda, and Kubernetes, its slow startup times and heavy memory consumption can drastically spike your cloud bills.

If you want to build a lightweight, ultra-fast microservice, you need to look at Quarkus — the Supersonic Subatomic Java framework.

In this tutorial, we will build a production-ready Java microservice using Quarkus, and I will show you how to compile it into a native binary that starts in milliseconds.

Why Quarkus?

Unlike traditional frameworks that defer reflection and configuration to runtime, Quarkus performs build-time optimizations.

• Tiny Footprint: Traditional Java apps take ~140MB of RAM. Quarkus native applications run on as little as 30MB.
• Instant Start: Boot times drop from several seconds to under 0.05 seconds.
• Developer Joy: Live coding means your changes take effect instantly without restarting the server.

Prerequisites

To follow along, ensure you have the following installed on your machine:

• GraalVM (or OpenJDK 17+)