In the previous chapter, we looked at what it takes to start with a pre-Java 9 code base and have it compile or run with minimal changes in the new Java 9 platform. We also looked at some problems you could face with your legacy code and how to solve them.
If you are working on a code base that you expect to make many changes or enhancements to, then you'll want to do more than just run it in Java 9. You'll want to take advantage of the modularity features that Java 9 provides. Of course, you shouldn't always blindly rewrite your application to use modules just because you can! The advantages of modularity--strong encapsulation and reliable configuration--are the most useful in applications where there is a large code base with clear boundaries and multiple teams working on it. In this chapter, we'll take a look at how you can...
