javalin the lightweight java framework

I'd like to introduce you all to Javalin. Java is known for being heavy and bloated, verbose, often flagged as bad choice for cold-start functions, or simple MVPs or POCs. Often because it's slow, or memory-heavy consumer, which I could agree with, on some situations.

This is specially interestring if you're coming from languages such as Go or Typescript and is already familiar with express.js or chi from Golang. The learning curve for a full Java backend app will be pretty smoth.

Let's cut to the chase, no rambling, no time spent. Javalin is simple, lightweight, interoperable, flexible, supports OpenAPI and runs on top of Jetty JVM web-server, that includes SSL and HTTP3.

Here's what a Hello World would look like, if you're curious.

import io.javalin.Javalin;

void main() {
  var app = Javalin.create(config -> {
    config.routes.get("/", ctx -> ctx.result("Hello World"));
  }).start(7070);
}

And that's it! No annotations needed, controllers, or any of the boilerplate that Springs like. As simple as that.

If you're a maven person, you can get started in the maven-setup page, but ify you're a graddle person, use the graddle-setup page.

On their page there's plenty of useful tutorials and code snippets, check it out. And now if you want to go straight to the code, find their GitHub repo at: https://github.com/javalin/javalin