Beginning Java 9 Modules
summary
Java modules introduce a module descriptor (module-info.java) that enforces explicit requires/exports relationships, adds a module path (-p / --module-path) and module invocation form (module/name.Main), and forbids no cyclic dependencies and no split packages, which often block naive migrations. Tools: jdeps can generate a starter descriptor, jlink produces stripped runtime images (example: simple app ~30 MB vs ~100 MB full JRE), and jpackage creates native installers; migration requires upgrading deps, using classpath first, then gradual modularization.
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chapters (7)
- 0:00Introduction to Java 9 Modules
- 3:53Problems with Java 8 class path
- 12:47Java 9 modules design and benefits
- 23:10Creating your first module
- 33:39Module types and paths
- 44:52JLink and JPackage for deployment
- 50:42Migration strategy for modules
