Modular Programming in Java 9

Refactoring into smaller modules

Now that you have your codebase in the module source path, the next steps would be to gradually break it down into smaller modules. This effort depends on the size of your codebase and how much of it you want to tackle at a time. You can choose to leave the single module as is and only create modules for any new code that you write. Thus, the legacy code does not get the benefit of modularity concepts, but any new code does. However, it is highly recommended to do the following two steps at this point:

1. Find modular versions or equivalents for your libraries and move the JARs out of the module path.
2. Break down the module into smaller modules.

Step 1 removes the broad transitive dependencies that automatic ...