IntelliJ IDEA Essentials (Jaroslaw Krochmalski) (Z-Library)

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IntelliJ IDEA Essentials Develop better software fast with IntelliJ IDEA Jarosław Krochmalski BIRMINGHAM - MUMBAI www.it-ebooks.info

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IntelliJ IDEA Essentials Copyright © 2014 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, and its dealers and distributors will be held liable for any damages caused or alleged to be 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. First published: December 2014 Production reference: 1161214 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-78439-693-0 www.packtpub.com www.it-ebooks.info

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Credits Author Jarosław Krochmalski Reviewers Scott Battaglia Andrew C. Dvorak Grzegorz Ligas Jan Thomä Commissioning Editor Dipika Gaonkar Acquisition Editors Ellen Bishop Sam Wood Content Development Editor Govindan K Technical Editor Aman Preet Singh Copy Editors Roshni Banerjee Adithi Shetty Project Coordinator Shipra Chawhan Proofreaders Simran Bhogal Stephen Copestake Maria Gould Ameesha Green Paul Hindle Indexer Monica Ajmera Mehta Production Coordinator Conidon Miranda Cover Work Conidon Miranda www.it-ebooks.info

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About the Author Jarosław Krochmalski is a passionate software designer and developer who specializes in the financial business domain. He has over 12 years of experience in software development. He is a clean-code and software craftsmanship enthusiast. He is a Certified ScrumMaster and a fan of Agile. His professional interests include new technologies in web application development, design patterns, enterprise architecture, and integration patterns. He likes to experiment with NoSQL and cloud computing. Jarosław has been working with IDEA since its first release and has observed the IDE grow and mature. He has been designing and developing software professionally since 2000 and has been using Java as his primary programming language since 2002. In the past, he worked for companies such as Kredyt Bank (KBC) and Bank BPS on many large-scale projects such as international money orders, express payments, and collection systems. He currently works as a consultant for the Danish company 7N and writes software for the Nykredit bank. You can reach him via Twitter at @jkroch or by e-mail at jarek@finsys.pl. I would like to thank my wife, Marylka, and my two boys, Wojtuś and Mati, for being patient and letting me finish the book. Without their help and understanding, this book would not have been possible. I would like to thank all the people at Packt Publishing, especially Govindan K, Aman Preet Singh, Ellen Bishop, Richard Gall, and Sam Wood—you've made the entire writing and publishing process very smooth and straightforward. A special thanks to all the technical reviewers and proofreaders for providing me with valuable feedback from which I have learned a lot. Thank you. Greetings to my friends at 7N, Nykredit, Kredyt Bank, and Bank BPS—I hope you enjoy reading the book as much as I enjoyed writing it. www.it-ebooks.info

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About the Reviewers Scott Battaglia is a senior software development engineer for Audible Inc. (http://www.audible.com/), which is an Amazon.com, Inc. company and the leading provider of premium digital spoken audio information. He currently leads the shared Android platform team and coaches on a variety of topics, including open source, interviewing, and Scrum. Prior to this, he was an identity management architect and senior application developer with Rutgers, the State University of New Jersey. He actively contributed to various open source projects, including Apereo Central Authentication Service (CAS) and Inspektr, and has previously contributed to Spring Security, Apereo OpenRegistry, and Apereo uPortal. He has spoken at a variety of conferences, including Jasig, EDUCAUSE, and Spring Forward on topics such as CAS, identity management, Spring Security, and software development practices. Grzegorz Ligas is a software developer passionate about delivering solutions that are efficient and reliable. He started his career with a small company, writing software for the manufacturing industry, and then moved to retail banking. He currently works for an investment bank in London. Working in various sectors exposed him to technologies varying from mobile to highly distributed grid applications. He's the author of, and main contributor to, the IntelliJ XQuery Support plugin whose goal is to make XQuery development a pleasure. www.it-ebooks.info

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Jan Thomä is an IT consultant with over 15 years of experience in the IT industry. He has worked for various organizations and businesses, both small and large, including the City of Hamburg, Deutsche Telekom, and the Social Democratic Party of Germany. He has been using and endorsing IntelliJ IDEA ever since he discovered it in 2005 while searching for a truly productive and integrated development environment. He wrote and contributed to several plugins for the IntelliJ platform, including the OSGi and Leiningen plugins. www.it-ebooks.info

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www.PacktPub.com Support files, eBooks, discount offers, and more For support files and downloads related to your book, please visit www.PacktPub.com. 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.PacktPub.com and, as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at service@packtpub.com for more details. At www.PacktPub.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. TM https://www2.packtpub.com/books/subscription/packtlib Do you need instant solutions to your IT questions? PacktLib is Packt's online digital book library. Here, you can search, access, and read Packt's entire library of books. Why subscribe? • Fully searchable across every book published by Packt • Copy-and-paste, print, and bookmark content • On-demand and accessible via a web browser Free access for Packt account holders If you have an account with Packt at www.PacktPub.com, you can use this to access PacktLib today and view nine entirely free books. Simply use your login credentials for immediate access. www.it-ebooks.info

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Table of Contents Preface 1 Chapter 1: Get to Know Your IDE, Fast 7 Comparing the various editions 7 Installing IntelliJ IDEA 8 An overview of the workspace 9 Tool windows 9 View modes in tool windows 11 Pinned Mode 11 Docked Mode 11 Floating Mode 12 Split Mode 12 Multiple views in tool windows 13 Navigating inside the tool window 14 Tool windows set up for a specific project 15 Editor tabs 16 Crafting your settings 17 Searching for options 17 Setting keyboard shortcuts 17 Colors and fonts 18 Picking your plugins 19 Configuration tips and tricks 21 Exporting and importing settings 21 Sharing settings 22 Tuning IntelliJ IDEA 23 Summary 24 www.it-ebooks.info

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Table of Contents [ ii ] Chapter 2: Off We Go – To the Code 25 What is a project? 26 Project structure and configuration 26 Comparison of Eclipse, NetBeans, and IntelliJ IDEA terminologies 27 The project 27 Modules 28 Folders 29 Libraries 31 Facets 33 Artifacts 35 Creating a project 37 Creating a new project from scratch 38 Importing the existing project 40 Project format 43 The directory-based format 44 The file-based format 44 The directory-based format versus the file-based format 45 Summary 45 Chapter 3: The Editor 47 An overview of the editor and setup 47 The gutter area 48 The Status bar 51 Tabs 53 Scratches 55 Scrollbar 56 Navigating in the editor 57 Navigating between files 58 Navigating within a single file 64 The Search Everywhere feature 66 The editor basics 67 Searching for and replacing text 67 Syntax-aware selection 69 Column selection mode 69 Clipboard history 70 Reformatting the code 70 Code completion 71 Language injection 73 Generating code 74 Code inspection 75 Using Live Templates 76 Postfix code completion 79 www.it-ebooks.info

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Table of Contents [ iii ] Comparing files and folders 80 Comparing files 80 Comparing folders 82 Looking for help 83 Viewing inline documentation 84 Viewing type definitions 84 Looking for usages 85 Viewing method parameters 85 Viewing the external documentation 86 Summary 87 Chapter 4: Make It Better – Refactoring 89 An overview of refactoring 89 Refactoring actions 95 Rename 95 Find and Replace Code Duplicates 96 Copy 96 Move 97 Move Instance Method 99 Safe Delete 99 Change Signature 100 Type Migration 101 Make Static 101 Convert to Instance Method 101 Extract refactorings 102 Extract Variable 102 Extract Constant 102 Extract Field 103 Extract Parameter 104 Introduce Parameter Object 105 Extract Method 105 The Extract Method object 106 Delegate 107 Extract Interface 109 Extract Superclass 110 Inline 110 Remove Middleman 112 Wrap Return Value 112 Invert Boolean 113 Pull Members Up or Push Members Down 113 Replace Inheritance With Delegation 113 www.it-ebooks.info

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Table of Contents [ iv ] Convert Anonymous Class to Inner 114 Encapsulate Fields 115 Replace Constructor with Factory Method / Builder 116 Generify 116 Summary 118 Chapter 5: Make It Happen – Running Your Project 119 A temporary configuration 120 The permanent configuration 121 The Run/Debug configuration for a Java application 122 Creating a Tomcat server local configuration 128 The Node.js configuration 133 Configuration defaults 134 Sharing the configuration 135 Running 136 Summary 138 Chapter 6: Building Your Project 139 Editing Maven settings 140 The Maven tool window 144 Running Maven goals 144 Using Gradle 148 Executing Gradle tasks 150 Summary 151 Chapter 7: Red or Green? Test Your Code 153 Enabling the testing plugins 154 Creating the test 156 Creating a run/debug configuration for the test 160 Running or debugging the test 164 Keyboard shortcuts 170 Summary 170 Chapter 8: Squash'em – The Debugger 171 Debugger settings 171 Setting up the JavaScript debugger 178 Managing breakpoints 180 Starting the debugger 191 The Debug tool window 193 Inspecting variables and evaluating expressions 196 Debugger actions 203 Keyboard shortcuts summary 206 Summary 206 www.it-ebooks.info

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Table of Contents [ v ] Chapter 9: Working with Your Team 207 Enabling version control 207 Configuring version control 210 Working with version control 217 Changelists 217 Adding files to version control 218 Committing files 220 Getting changes from the repository 224 Browsing the changes 226 Reverting the local changes 227 Using the difference viewer 228 Displaying the history 231 The log viewer 233 Quickly executing VCS actions 234 Keyboard shortcuts 236 Summary 236 Chapter 10: Not Enough? Extend It 237 Setting up the environment and project 238 Developing the plugin functionality 241 Deploying and publishing 247 Summary 251 Index 253 www.it-ebooks.info

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Preface The first version of IntelliJ IDEA was released in January 2001. It is a mature, integrated development environment (IDE), designed to help you in the coding process, and supports a large number of different frameworks, tools, and targets. It works with multiple programming languages. It now includes full support for Java 8 and Java EE 7. The key objective of IntelliJ IDEA is to increase and assist developer productivity. Whether you develop in Java, Scala, or PHP, or make the frontend using HTML and JavaScript, IntelliJ IDEA's smart and relevant suggestions and code completion, on-the-fly code analysis, and respectable refactoring tools will support you in every step. When you are migrating from NetBeans or Eclipse, you will quickly see that IntelliJ IDEA is different because it understands the context. The IDE knows where you are in the editor and reacts accordingly; you will be surprised at how smart IntelliJ IDEA behaves. This tool is a generic workhorse rather than a strict Java IDE. In this book, you will learn how to make IntelliJ IDEA work for you and get your job done in the most efficient and pleasant way. What this books covers Although the book describes the latest version of IntelliJ IDEA - 14, most of the concepts will also work on the previous revision of the IDE. Chapter 1, Get to Know Your IDE, Fast, is a very concise note on editions comparison, requirements and installing IntelliJ IDEA in Windows, OSX, and Linux. This chapter guides you through the main workspace and show you ways to customize it for different tasks, presenting briefly the most useful plugins, IDE settings, and configuration tips. www.it-ebooks.info

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Preface [ 2 ] Chapter 2, Off We Go—To the Code, describes the process of setting up a new project or importing an existing one. The chapter explains terminology differences with NetBeans and Eclipse and presents the concept of modules and artifacts. Chapter 3, The Editor, describes the core of IntelliJ IDEA—the editor. In this chapter, you use state-of-the-art code completion, templates, and other great IntelliJ IDEA features. This chapter shows how to set up the editor and gives you some productivity tips. Chapter 4, Make It Better—Refactoring, presents the powerful refactoring toolset of IntelliJ IDEA. You are guided through the most useful refactoring techniques. Chapter 5, Make It Happen—Running Your Project, covers configuring the runtime environment for your project. We also talk about adding run configurations, either on the server or standalone. This chapter focusses not only on Java, but on other technologies such as Node.js as well. Chapter 6, Building Your Project, focusses on building a project. You use IntelliJ IDEA's own build system, and Maven and Gradle integration as well. Chapter 7, Red or Green? Test Your Code, is all about unit testing in IntelliJ IDEA. We focus on setting IntelliJ IDEA up specifically to run tests. You create JUnit and TestNG run configurations and then run and debug the tests. Then, you are given a brief overview of the test runner windows, useful settings, and option suggestions. Chapter 8, Squash'em – The Debugger, focusses on the IntelliJ IDEA debugger. You get familiar with the debugger tool window and debugger options. We look under the hood—evaluating expressions, using watches, conditional breakpoints, and other debugger features. We also talk briefly about remote debugging. Chapter 9, Working with Your Team, This chapter is all about version control, and managing change lists and tasks. There is a brief description on how to set up VCS integration, with the main focus on Git. This chapter describes integration with popular bug trackers, such as JIRA and YouTRACK. Chapter 10, Not Enough? Extend It, describes briefly the plugin architecture of IntelliJ IDEA. We talk about possibilities and develop a simple plugin, so that you have knowledge of how to extend the IDE. You are also presented with useful links and resources to develop your knowledge even further. www.it-ebooks.info

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Preface [ 3 ] What you need for this book You will need a Mac or PC, running OS X, MS Windows, or Linux, to be able to set up and run IntelliJ IDEA. To learn the presented features, you will also need the tool itself, of course. You can use the free 30-day trial of Ultimate Edition or use the Community Edition, which is available free of charge. We will flag the differences and let you know what features are not available in the free version of the IDE. You can read how to get it in Chapter 1, Get to Know Your IDE, Fast. Who this book is for This book is a fast-paced introduction to IntelliJ IDEA and is aimed at users who want to learn the essentials of the new IDE in a nimble and efficient way. Conventions In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning. Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "If you keep getting OutOfMemoryError in PermGen space exceptions, try to change the -XX:MaxPermSize setting." A block of code is set as follows: private boolean isValid(int a) { return a > 15 && a < 100; } Any command-line input or output is written as follows: git clone git://git.jetbrains.org/idea/community.git idea New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "To do this, first download the IntelliJ Configuration Server plugin, using the Plugins page of the Settings dialog box." www.it-ebooks.info

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Preface [ 4 ] Warnings or important notes appear in a box like this. Tips and tricks appear like this. Reader feedback Feedback from our readers is always welcome. Let us know what you think about this book—what you liked or disliked. Reader feedback is important for us as it helps us develop titles that you will really get the most out of. To send us general feedback, simply e-mail feedback@packtpub.com, and mention the book's title in the subject of your message. If there is a topic that you have expertise in and you are interested in either writing or contributing to a book, see our author guide at www.packtpub.com/authors. Customer support Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase. Errata Although we have taken every care to ensure the accuracy of our content, mistakes do happen. If you find a mistake in one of our books—maybe a mistake in the text or the code—we would be grateful if you could report this to us. By doing so, you can save other readers from frustration and help us improve subsequent versions of this book. If you find any errata, please report them by visiting http://www.packtpub. com/submit-errata, selecting your book, clicking on the Errata Submission Form link, and entering the details of your errata. Once your errata are verified, your submission will be accepted and the errata will be uploaded to our website or added to any list of existing errata under the Errata section of that title. To view the previously submitted errata, go to https://www.packtpub.com/books/ content/support and enter the name of the book in the search field. The required information will appear under the Errata section. www.it-ebooks.info

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Preface [ 5 ] Piracy Piracy of copyrighted material on the Internet is an ongoing problem across all media. At Packt, we take the protection of our copyright and licenses very seriously. If you come across any illegal copies of our works in any form on the Internet, please provide us with the location address or website name immediately so that we can pursue a remedy. Please contact us at copyright@packtpub.com with a link to the suspected pirated material. We appreciate your help in protecting our authors and our ability to bring you valuable content. Questions If you have a problem with any aspect of this book, you can contact us at questions@packtpub.com, and we will do our best to address the problem. www.it-ebooks.info