A fully working http2 example using Javalin

Javalin let you modify the jetty server, given that jetty supports http2 out of box. Here is a way to start the http2 server

First you need to generate the keystore using the following command

keytool -genkey -alias jetty -storetype PKCS12 -keyalg RSA -keysize 2048 -keystore keystore.p12 -validity 3650

I'm using Conscrypt, which is the recommended way by Jetty for both speed and security.

When you run the main class, there will be a http 1.1 server on port 8080. and http2 server on 8443 with fall back to SSL http 1.1

Open chrome and go to https://localhost:8443 you'll see in the Developer tools under network tab, you are connecting using h2

Discussion in github issue

the api version you need to use is specific to the java 8 version you are running as per here