This is a minimal example of an application that can be modularized using JLink and distributed with it's own JRE containing only the required Java modules and this application.

The maven project has two modules to emulate a real modular application. The api module contains a Student class representing the API. The app module contains a Main class that instansiates three student objects and prints the information to System.out when run. This is supposed to emulate the main application that would start an application server and run a real application.

Make sure you are using Java 12

• java -version and mvn -version should both show some Java 12 version/build

mvn clean install

mkdir libs

cp api/target/jlink-api-1.0-SNAPSHOT.jar libs/

cp app/target/jlink-app-1.0-SNAPSHOT.jar libs/

Remember to change the below path to the JDK to something that matches your installation location.

jlink --module-path "/c/java/jdk-12/jmods/;libs" --add-modules no.hamre.java9workshop.jlink.api,no.hamre.java9workshop.jlink.app --output image/

This will create the custom JRE with the application in the image folder

cd image

./bin/java -m no.hamre.java9workshop.jlink.app/no.hamre.java9workshop.jlink.app.Main

Chekout the branch maven-plugin.

Here we are using maven-jlink-plugin to build the JRE. With this plugin the maven project has a new module, image, used only for building the JRE from the other two modules using the plugin.