Modern Java in Action

Chapter 14. The Java Module System

This chapter covers

• The evolutionary forces causing Java to adopt a module system
• The main structure: module declarations and requires and exports directives
• Automatic modules for legacy Java Archives (JARs)
• Modularization and the JDK library
• Modules and Maven builds
• A brief summary of module directives beyond simple requires and exports

The main and most-discussed new feature introduced with Java 9 is its module system. This feature was developed within project Jigsaw, and its development took almost a decade. This timeline is a good measure of both the importance of this addition and the difficulties that ...