A Jigsaw tutorial explaining how to create modules, state dependencies between them, and use the module system as a service locator to decouple modules.

nipafx (Nicolai Parlog)

A hands-on walkthrough of Java 9's Project Jigsaw module system using an advent calendar demo app. Covers three progressive steps: wrapping existing code in a single module, splitting a monolith into multiple modules with explicit dependencies and exports, and using the ServiceLoader/service locator pattern to decouple modules from concrete implementations. Includes module-info.java examples, compile/run commands, and explanations of key concepts like requires, exports, transitive readability, and provides/uses clauses.

Jigsaw Hands-On Guide // nipafx