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Modular Programming in Java 9

By : Kothagal

4.5 (2)

Modular Programming in Java 9

4.5 (2)

By: 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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

Introducing Java 9 Modularity

Introducing Java 9 Modularity

Modularity in Java

Rethinking Java development with packages

Java - the 20-year-old code base

Java Platform Module System

Project Jigsaw

Summary

Creating Your First Java Module

Creating Your First Java Module

Setting up the JDK

Switching between JDKs

Setting up the NetBeans IDE

Java 9 modules

Creating a module using NetBeans

The address book viewer application

Handling possible errors

Summary

Handling Inter-Module Dependencies

Handling Inter-Module Dependencies

Creating the second module

Compiling two modules

Configuring module dependency

Module versioning

Rethinking package structure

Understanding module path arguments

Revisiting classpath

Revisiting the classpath problems

Summary

Introducing the Modular JDK

Introducing the Modular JDK

Examining the legacy JDK

Enter Project Jigsaw

Platform modularity

Observable modules

Revisiting the two problems

Summary

Using Platform APIs

Using Platform APIs

Adding logging ability

Reading contacts from an XML file

Adding UI with Java FX

Summary

Module Resolution, Readability, and Accessibility

Module Resolution, Readability, and Accessibility

Readability

Accessibility

Tweaking modularity

Applying the concepts to address book viewer

Summary

Introducing Services

Introducing Services

The problem of coupling

Understanding services

Advanced services

Services and the module system goals

Summary

Understanding Linking and Using jlink

Understanding Linking and Using jlink

Module resolution process

Revisiting the state of the JDK

Linking using jlink

Building a modular JAR file

Summary

Module Design Patterns and Strategies

Module Design Patterns and Strategies

Designing modules

Modularizing by concerns

Modularizing by layers

Modularizing by change patterns

Designing API

Java modules coding patterns and strategies

Summary

Preparing Your Code for Java 9

Preparing Your Code for Java 9

Beginning Java 9 migration

Introducing the sample Java 8 application

Using the Java 9 compiler and runtime

Understanding the impact

Recommended strategy

Summary

Migrating Your Code to Java 9

Migrating Your Code to Java 9

Understanding the migration goal

Beginning the migration

Handling larger codebases

Migrating libraries

Building libraries for multiple Java versions

Summary

Using Build Tools and Testing Java Modules

Using Build Tools and Testing Java Modules

Integrating with Apache Maven

Unit testing modules with Java 9

Wrapping up

Summary

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Preparing Your Code for Java 9

In the last chapter, we looked at several patterns and best practices to use when building Java 9 modular applications. They are an extremely handy set of rules to remember when building new applications. But it's not always that developers have the opportunity to work on greenfield projects where they have the freedom to think about and build application architecture from scratch. What if there's already a lot of code built using Java 8 or earlier? How do we migrate such code to Java 9?

In this chapter, we'll be covering:

Working on legacy code and getting it ready to be run in Java 9
Compiling legacy code in Java 9 and executing pre-Java 9 compiled code in the Java 9 runtime
Classpath behaviors in Java 9 and the unnamed module
Handling errors and non-standard API access and using the jdeps tool
Using override switches to work around...

Visually different images

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Tech Concepts

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Programming languages

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