Book Image

Modular Programming in Java 9

By : Koushik Srinivas Kothagal
Book Image

Modular Programming in Java 9

By: Koushik Srinivas Kothagal

Overview of this book

The Java 9 module system is an important addition to the language that affects the way we design, write, and organize code and libraries in Java. It provides a new way to achieve maintainable code by the encapsulation of Java types, as well as a way to write better libraries that have clear interfaces. Effectively using the module system requires an understanding of how modules work and what the best practices of creating modules are. This book will give you step-by-step instructions to create new modules as well as migrate code from earlier versions of Java to the Java 9 module system. You'll be working on a fully modular sample application and add features to it as you learn about Java modules. You'll learn how to create module definitions, setup inter-module dependencies, and use the built-in modules from the modular JDK. You will also learn about module resolution and how to use jlink to generate custom runtime images. We will end our journey by taking a look at the road ahead. You will learn some powerful best practices that will help you as you start building modular applications. You will also learn how to upgrade an existing Java 8 codebase to Java 9, handle issues with libraries, and how to test Java 9 applications.
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Integrating with Apache Maven


Two of the build systems that are very commonly used in the Java landscape are Apache Maven and Gradle. When you are working on an enterprise Java application, it's very likely that you'll have to deal with one of these two options. In this book so far, we've been working with the command line to get the compiler and runtime to execute. However, that's rarely a reasonable thing to do in a complex project. So, what does it take to use such a build system in a Java 9 modular application?

Note

At the time of writing this, Maven has a workable integration with Java 9, while Gradle is still in active development. Thus, we'll only be covering Apache Maven integration in this book. It's only a matter of time before the Java tooling ecosystem catches up to the modularity changes in Java 9, so it shouldn't be surprising to see better integration and an overall experience of using these tools with Java 9 over time.

Let's examine the way you can create a Maven project that...