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Nilang Patel - Java 9 Dependency Injection: Write loosely coupled code with Spring 5 and Guice

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Java 9 Dependency Injection: Write loosely coupled code with Spring 5 and Guice: summary, description and annotation

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Create clean code with Dependency Injection principles

Key Features
  • Use DI to make your code loosely coupled to manage and test your applications easily on Spring 5 and Google Guice
  • Learn the best practices and methodologies to implement DI
  • Write more maintainable Java code by decoupling your objects from their implementations
Book Description

Dependency Injection (DI) is a design pattern that allows us to remove the hard-coded dependencies and make our application loosely coupled, extendable, and maintainable. We can implement DI to move the dependency resolution from compile-time to runtime. This book will be your one stop guide to write loosely coupled code using the latest features of Java 9 with frameworks such as Spring 5 and Google Guice.

We begin by explaining what DI is and teaching you about IoC containers. Then youll learn about object compositions and their role in DI. Youll find out how to build a modular application and learn how to use DI to focus your efforts on the business logic unique to your application and let the framework handle the infrastructure work to put it all together.

Moving on, youll gain knowledge of Java 9s new features and modular framework and how DI works in Java 9. Next, well explore Spring and Guice, the popular frameworks for DI. Youll see how to define injection keys and configure them at the framework-specific level. After that, youll find out about the different types of scopes available in both popular frameworks. Youll see how to manage dependency of cross-cutting concerns while writing applications through aspect-oriented programming.

Towards the end, youll learn to integrate any third-party library in your DI-enabled application and explore common pitfalls and recommendations to build a solid application with the help of best practices, patterns, and anti-patterns in DI.

What you will learn
  • Understand the benefits of DI and fo from a tightly coupled design to a cleaner design organized around dependencies
  • See Java 9s new features and modular framework
  • Set up Guice and Spring in an application so that it can be used for DI
  • Write integration tests for DI applications
  • Use scopes to handle complex application scenarios
  • Integrate any third-party library in your DI-enabled application
  • Implement Aspect-Oriented Programming to handle common cross-cutting concerns such as logging, authentication, and transactions
  • Understand IoC patterns and anti-patterns in DI
Who this book is for

This book is for Java developers who would like to implement DI in their application. Prior knowledge of the Spring and Guice frameworks and Java programming is assumed.

Table of Contents
  1. Why Dependency Injection?
  2. Dependency Injection in Java 9
  3. Dependency Injection with Spring
  4. Dependency Injection with Google Guice
  5. Scopes
  6. Aspect-Oriented Programming and Interceptors
  7. IoC Patterns and Best Practices

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Java 9 Dependency Injection
Write loosely coupled code with Spring 5 and Guice
Krunal Patel
Nilang Patel

BIRMINGHAM - MUMBAI Java 9 Dependency Injection Copyright 2018 Packt - photo 1

BIRMINGHAM - MUMBAI
Java 9 Dependency Injection

Copyright 2018 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(s), 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: Merint Mathew
Acquisition Editors: Denim Pinto / Nitin Dasan
Content Development Editor: Anugraha Arunagiri
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Graphics: Tania Dutta
Production Coordinator: Arvindkumar Gupta

First published: April 2018

Production reference: 1250418

Published by Packt Publishing Ltd.
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B3 2PB, UK.

ISBN 978-1-78829-625-0

www.packtpub.com

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Contributors
About the authors

Krunal Patel has been working at Liferay Portal for over 5 years and has over 9 years of experience in enterprise application development using Java and Java EE technologies. He has worked in various domains, such as healthcare, hospitality, and enterprise intranet.

He was awarded an ITIL Foundation Certificate in IT Service Management in 2015, a Liferay 6.1 Developer Certification in 2013, and a MongoDB for Java Developers certificate in 2013.

He has reviewed Mastering Apache Solr 7.x by Packt Publishing.

I would like to thank my loving wife Jigna, son Dirgh, father Maheshbhai, mother Sudhaben, brother Niraj, sister-in-law Krishna, and niece Risha, for supporting me throughout the course of writing this book. Thanks also to KNOWARTH, my coauthor and the Packt team, especially Anugraha and Peter Verhas, for their insightful comments.

Nilang Patel has over 14 years of core IT experience in leading project, software design and development, and supporting enterprise applications using enterprise Java technologies.

He is experienced in core Java/J2EE based application and has experience in healthcare, human resource, taxation, intranet application, energy and risk management domain . He contributes to various forums and has a personal blog.

He acquired the Liferay 6.1 Developer Certification in 2013, Brainbench Java 6 certification in 2012, and a Sun Certified Programmer for the Java 2 Platform 1.5 (SCJP) in 2007.

With the divine blessings of Bhagwan Swaminarayan and my guru HH Pramukh Swami Maharaj and Mahant Swami Maharaj, I, Nilang could accomplish such a wonderful milestone. I am equally thankful to all reviewers at Packt. I would like to express my deep gratitude to my wife Komal and my daughters Bhakti and Harmi for making all possible adjustments and for their support.
About the reviewer

Peter Verhas is a senior software engineer and software architect with a background in electrical engineering and economics. He gained an MSc from TU Budapest and an MBA from PTE Hungary, and studied at TU Delft and TU Vienna too. He created his first programs in 1979, and since then, he has authored several open source programs.

Peter now works for EPAM Systems in Switzerland, participating in software development projects at various customer sites. He also supports talent acquisition, interviewing candidates, and designing internal mentoring and training programs for developers.

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Table of Contents
Preface

Dependency Injection is a design pattern that allows us to remove the hardcoded dependencies and make our application loosely coupled, extendable, and maintainable. We can implement dependency injection to move the dependency resolution from compile-time to runtime.
This book will be your one-stop guide to writing loosely coupled code using the latest features of Java 9 with frameworks such as Spring 5 and Google Guice.

Who this book is for

This book is for Java developers who would like to understand how to implement Dependency Injection in their applications. Prior knowledge about the Spring and Guice frameworks and Java programming is assumed.

What this book covers

, Why Dependency Injection? , gives you a detailed insight into various concepts, such as Dependency Inversion of Principle (DIP), Inversion of Control (IoC), and Dependency Injection (DI). It also talks about practical use cases where DI is commonly used.

, Dependency Injection in Java 9 , gets you acquainted with Java 9 features and its modular framework, and explains how to implement DI using the service loader concept.

, Dependency Injection with Spring , teaches you how to manage dependency injection in the Spring framework. It also describes a different way to implement DI using Spring.

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