Francesco Marchioni - Hands-On Cloud-Native Applications with Java and Quarkus: Build high performance, Kubernetes-native Java serverless applications

Copyright 2019 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing or its dealers and distributors, will be held liable for any damages caused or alleged to have been caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

Commissioning Editor: Kunal Chaudhari
Acquisition Editor: Alok Dhuri
Content Development Editor: Pathikrit Roy
Technical Editor: Gaurav Gala
Copy Editor: Safis Editing
Senior Editor : Rohit Singh
Project Coordinator: Francy Puthiry
Proofreader: Safis Editing
Indexer: Priyanka Dhadke
Production Designer: Aparna Bhagat

First published: December 2019

Production reference: 1131219

Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham
B3 2PB, UK.

ISBN 978-1-83882-147-0

www.packt.com

Packt.com

Subscribe to our online digital library for full access to over 7,000 books and videos, as well as industry leading tools to help you plan your personal development and advance your career. For more information, please visit our website.

• Spend less time learning and more time coding with practical eBooks and Videos from over 4,000 industry professionals

• Improve your learning with Skill Plans built especially for you

• Get a free eBook or video every month

• Fully searchable for easy access to vital information

• Copy and paste, print, and bookmark content

Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.packt.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at customercare@packtpub.com for more details.

At www.packt.com , you can also read a collection of free technical articles, sign up for a range of free newsletters, and receive exclusive discounts and offers on Packt books and eBooks.

I've been involved with Java and enterprise Java since 1995-96 and over the intervening years, I've been impressed by the passion of the developers within communities who find innovative ways to improve their own productivity and that of others. Various significant changes to our industry have occurred and Java has continued to remain relevant. Whether it's service-oriented architecture, RESTful development, Internet of Things, microservices, or hybrid cloud, Java has found a way to ensure that developers can bring much of what they've learned prior to the advent of these waves with them so they don't have to re-invent the wheel.

However, sometimes that wheel does need a bit of shaking up. Not everything that is applicable to one type of deployment environment is necessarily going to be useful to another. And we've seen that with the cloud, Platform-as-a-Service and, specifically, Kubernetes and Linux containers. The Java Virtual Machine (JVM) represents a huge and impressive amount of work by countless developers from several vendors over two decades.

Despite the fact that Java began life aimed at constrained devices, it rapidly evolved into a world where the assumptions are quite different compared to the cloud today, such as, the ability to consume a lot of memory, the requirements to dynamically update the running application/environment, and other runtime optimizations. Concerns about Java (performance, runtime memory footprint, boot time, and so on) have caused some to re-evaluate their investment with Java and consider some of the newer languages, despite the fact that many of those languages dont yet have the rich ecosystem of tools, utilities, and so on that have been built up over the years by the Java community.

This is where Quarkus comes in! It aims to make Java relevant in the modern Kubernetes world. I've seen frameworks and stacks come and go over the decades, with some of them being massively successful for their time. However, whether it's DCE, CORBA, JBoss, or Spring, I've never seen anything quite like Quarkus in terms of almost instantaneous popularity, the ability to capture the imagination of people, being able to mine a deep-rooted need for Java developers, and to create a new wave: true Kubernetes-native Java middleware.

And I try to say that objectively, given that I've been involved with Quarkus since the very beginning. As you're about to find out when you read this book, it truly feels like "a paradigm shift." It enables developers to bring their Java skills to Kubernetes and feel like they can be as (or more) productive as developers using other languages and even other Java frameworks/stacks.

I'm really pleased to see this book coming out so quickly on the back of the initial Quarkus release and thus filling an important need for existing Quarkus developers and those thinking about trying it out. The fact the author works within Red Hat JBoss Middleware, from where Quarkus originated, and specifically in our QE group, gives a unique view that readers interested in learning about Quarkus and developers interested in using it can both enjoy and benefit from. I hope you find it as interesting to read the book as I did!

Mark Little

Red Hat's Vice President, Middleware Engineering

Francesco Marchioni is a Red Hat Certified JBoss Administrator (RHCJA) and Sun Certified Enterprise Architect (SCEA) working at Red Hat in Rome, Italy. He started learning Java in 1997, and since then he has followed all the newest application program interfaces released by Sun. In 2000, he joined the JBoss community, when the application server was running the 2.X release.

He has spent years as a software consultant, where he has enabled many successful software migrations from vendor platforms to open source products, such as JBoss AS, fulfilling the tight budget requirements necessitated by the current economy. Over the last 10 years, he has authored many technical articles forO'ReillyMedia and has run an IT portal focused on JBoss products.