Tutorials

Some of the tutorials have code examples in both Kotlin and Java (check the blue tags), but it should be easy to follow along even if they don’t. The official tutorials are simple and mainly focus on one core concept at the time, while the community tutorials are usually more complex.

Official tutorials

Community tutorials

Building an Omegle clone in Javalin

In this tutorial we will build a simple WebRTC video conference application in Javalin. The application will be similar to Omegle, where you are paired with a random stranger and can chat with them.

java kotlin
Bazel setup

Run your Javalin app with Bazel, from a template project

kotlin
A quick intro to SSL in Java

Learn how SSL works and how to secure your Javalin application with SSL.

java kotlin
Docker setup

Create a Docker image from your Javalin application.

java
Testing Javalin Applications

Learn how to run different kinds of tests in Javalin. Unit tests, functional/integration tests, UI/end-to-end tests.

java kotlin
Documenting endpoints with OpenAPI 3

Learn how to document endpoints using OpenAPI 3, and how to render interactive docs using Swagger UI and ReDoc

java kotlin
Simple frontends with Javalin and Vue

The tutorial shows how to use the JavalinVue plugin for simplified frontend development

kotlin
Jetty session handling

The tutorial includes persisting sessions locally and in a database, as well as caching and clustering

java kotlin
WebSockets Google Docs clone

Learn how to create a very basic clone of Google Docs with WebSockets in Javalin

java kotlin
Creating monitoring dashboards

Learn how to setup monitoring using Prometheus (and Grafana)

java kotlin
WebSockets chat application

Learn how to create a simple chat-app with WebSockets in Javalin

java kotlin
Secure your endpoints!

Learn how to secure your endpoints using before-filters and route-roles

java kotlin
Sending emails from a Javalin backend

Create a 'Contact us' form with email sending (gmail) with a Javalin backend

java kotlin
HTML forms & Javalin backend

Learn how to get/post HTML forms to a Javalin backend

java kotlin
Single-page app with Kotlin and Vue.js

Use Vue.js and Kotlin to create the famous TODO MVC app

kotlin
Deploying to Heroku

Deploy a Javalin Hello World application on Heroku!

java
Kotlin CRUD REST API

Use Kotlin with Javalin to create a simple CRUD REST API.

kotlin
Gradle setup

Set up a Javalin project using Gradle in IntelliJ IDEA

kotlin
Maven setup

Set up a Javalin project using Maven in IntelliJ IDEA and Eclipse.

java

These community tutorials are written by Javalin users and posted at their request and/or with their permission. If you have have a tutorial you want to submit, please create a pull request on GitHub.

Tutorials

Building an Omegle clone in Javalin

Bazel setup

A quick intro to SSL in Java

Docker setup

Testing Javalin Applications

Documenting endpoints with OpenAPI 3

Simple frontends with Javalin and Vue

Jetty session handling

WebSockets Google Docs clone

Creating monitoring dashboards

WebSockets chat application

Secure your endpoints!

Sending emails from a Javalin backend

HTML forms & Javalin backend

Single-page app with Kotlin and Vue.js

Deploying to Heroku

Kotlin CRUD REST API

Gradle setup

Maven setup

Using Javalin with Hibernate ORM

Extra details on Javalin and logging providers

mTLS in Javalin

Javalin with Java Platform Module System (JPMS) and Gradle

Using Javalin with Bukkit, Spigot, Paper, BungeeCord, or Waterfall!

Serving Protobuf via a REST API

Javalin as a simulator for HTTP-based APIs

Frontends With Mithril and Javalin

Tracing Javalin Application

Using Sureness to protect the security of Javalin REST API.

Deploy Kotlin REST API to Raspberry Pi.

Rendering jte templates in Javalin

Mockito Testing

Embed Javalin Into Servlet Container

Running on GraalVM (22MB total size)

JWT in a Javalin Application

Java 10 and Google Guice

Real time analytics with influxDB

Basic website structure