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

Persistent issues

Even with the advent of Java 9, there were downsides to Java's garbage collection system. Because it is an automatic process, we do not have complete control of when the collector runs. We, as developers, are not in control of garbage collection, the JVM is. The JVM makes the decision when to run garbage collection. As you have seen earlier in this chapter, we can ask the JVM to run garbage collection using the System.gc() method. Despite our use of this method, we are guaranteed that our request will be honored or that it will be complied with in a timely manner.

Earlier in this chapter, we reviewed several approaches and algorithms for garbage collection. We discussed how we, as developers, can take control of the process. That assumes that we have the ability to take control of garbage collection. Even when we specify a specific garbage collection technique, for example using -XX:+UseConcMarkSweepGC for CMS garbage collection, we are not guaranteed that the JVM will use...