This silly experiment demonstrates use of GNU Make to compile modular Java source code with unit tests and automatic download of Maven style dependency specs. The project uses the Maven standard directory layout and has build and runtime dependencies (testing frameworks). Requires a JDK 11+, GNU Make and Unix-like environment to run. This is bare bones and no fancy Maven or IDE is here to help with compiling and launching anything. As such, it works as a sandbox for learning lower level stuff about java, javac and the module system.

Purpose: experiment with GNU Make and java, and learn about some options of the Java module system and how to get it working in conjunction with unit tests and source code building in general.

I do not recommend using GNU Make to build Java projects in general. However, it is blazingly fast once it works, compared to Maven or other tools :).

Download jar dependencies and compile the sources:

make

Launch unit tests:

make test

By default launches JUnit 5 with Java 9+ module selection, rather than old style class path scanning. You can customize arguments to JUnit launcher by setting variable JUNIT_ARGS.

Or launch module main class:

make main

You can change to a different main class by setting variable MAINCLASS to a fully qualified class name in the main module.

Show info an all Java modules in project:

make modinfo

http://openjdk.java.net/projects/jigsaw/doc/ModulesAndJavac.pdf

https://sormuras.github.io/blog/2018-09-11-testing-in-the-modular-world.html

https://nipafx.dev/five-command-line-options-hack-java-module-system