2 Java modules
This chapter covers
- Java’s platform modules
- Changes to access control semantics
- Writing modular applications
- Multi-release JARs
As mentioned in chapter 1, versions of Java, up to and including Java 9, were delivered according to a feature-driven release plan, often with a major new capability that defined or was strongly associated with the release.
For Java 9, this feature was Java Platform Modules (also known as JPMS, Jigsaw, or just “modules”). This is a major enhancement and change to the Java platform that had been discussed for many years—it was originally conceived of as potentially shipping as a part of Java 7, back in 2009/2010.
In this chapter, we will explain the reasons modules are needed, as well as the new syntax ...
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