Book Image

Java 9: Building Robust Modular Applications

By : Dr. Edward Lavieri, Peter Verhas, Jason Lee
Book Image

Java 9: Building Robust Modular Applications

By: Dr. Edward Lavieri, Peter Verhas, Jason Lee

Overview of this book

Java 9 and its new features add to the richness of the language; Java is one of the languages most used by developers to build robust software applications. Java 9 comes with a special emphasis on modularity with its integration with Jigsaw. This course is your one-stop guide to mastering the language. You'll be provided with an overview and explanation of the new features introduced in Java 9 and the importance of the new APIs and enhancements. Some new features of Java 9 are ground-breaking; if you are an experienced programmer, you will be able to make your enterprise applications leaner by learning these new features. You'll be provided with practical guidance in applying your newly acquired knowledge of Java 9 and further information on future developments of the Java platform. This course will improve your productivity, making your applications faster. Next, you'll go on to implement everything you've learned by building 10 cool projects. You will learn to build an email filter that separates spam messages from all your inboxes, a social media aggregator app that will help you efficiently track various feeds, and a microservice for a client/server note application, to name just a few. By the end of this course, you will be well acquainted with Java 9 features and able to build your own applications and projects. This Learning Path contains the best content from the following two recently published Packt products: • Mastering Java 9 • Java 9 Programming Blueprints
Table of Contents (33 chapters)
Title Page - Courses
Packt Upsell - Courses
Taking Notes with Monumentum

Quick review of Project Jigsaw

Project Jigsaw is the Java project that encompasses several change recommendations to the Java platform. As you have read in earlier chapters, Java 9's greatest changes involve modules and modularity. The initiative to move to modules in Java was driven by Project Jigsaw. The need for modularity stemmed from two major challenges with Java:

  • Classpath
  • JDK

Next, we will review both of those challenges and see how they were addressed and overcome with the new release to the Java platform, Java 9.


Prior to Java 9, the classpath was problematic and the source of developer anguish. This was evident in the numerous developer forums and, fortunately, Oracle was paying attention. Here are the several instances in which the classpath can be problematic; here are two primary cases:

  • The first case involves having two or more versions of a library on your development computer. The way this was previously handled by the Java system was inconsistent. Which library was...