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

Modular Java application packaging [JEP-275]

One of the great improvements in Java 9 is the size of the runtime binaries generated by the Java Packager. This is possible in part due to the Java Linker, which is covered in the next section. The Java Packager's workflow has essentially remained the same in Java 9 as it was in Java 8. There have been, as you will see later in this section, new tools added to the workflow.

The Java Packager solely creates JDK 9 applications. This change to the Java Packager is intended to streamline and make the process of generating runtime images more efficient. So, the Java Packager will only create runtime images for the SDK version that it is associated with.

Advanced look at the Java Linker

Prior to the Java Linker tool, jlink, introduced in Java 9, runtime image creation included copying the entire JRE. Then, unused components are removed. Simply put, jlink facilitates the creation of runtime images with only the required modules. jlink is used by the Java...