Modern Java: Second Edition
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Modern Java: Second Edition

Java 17 and the Java Ecosystem

About the Book

Who is this for?

This book is for anyone who wants to learn more about Java programming up to and including Java 17. It helps to have a background in some programming language and a basic understanding of Java.

What is covered?

Java and the JVM platform have made huge strides in the past several years. In Project Lambda, Java got lambda expressions, method-references, and default and static methods on interfaces. Java 9 added modularity, jshell, and Reactive support. Java 10-11 added local variable type inference (var) and Java 12-17 added switch expressions, pattern matching instanceof, multi-line strings, and records. At the same time, many new frameworks have reached full maturity and vastly improved over the previous models for building, testing, and developing web applications.

This book will help you understand:

  • The new features released in Java 10-17, such as "var", multi-line strings, and records
  • Java 9+, including: Project Jigsaw, JShell, language updates, and Reactive support.
  • Java 8+, including: Project Lambda, the new Date-Time API, Streams, default methods, Nashorn, and more.
  • Concurrent programming such as Fork/Join, Futures, Promises, Parallel Streams, and RxJava.
  • Great web frameworks in Java, such as Spring Boot, Spark, Play, and Ratpack.
  • The fundamentals of Groovy and how it can improve your Java projects.
  • Testing with JUnit and Spock.
  • Building with Maven and Gradle.
  • Microservices, REST, Cloud...
  • Logback, Hibernate, Guava...
  • Much more...


Java is a registered trademark of Oracle. You can find Java here on Oracle's website.

About the Author

Adam L. Davis
Adam L. Davis

Adam Davis makes software. He's spent many years developing in Java (since Java 1.2) and has enjoyed using Spring, Hibernate, Grails, and many others. He has used Java, Groovy, JavaScript, AWS, and much more to build applications for over a decade and has worked at both large and small corporations. Adam is a Certified Spring Professional and has a Masters and a Bachelors degree in Computer Science from Georgia Tech.

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Table of Contents

    • Introduction
      • Always be learning
      • Who is this book for?
      • What is this book about?
      • What this book is not about
    • Starting Out
  • Part I: Java
    • Java
      • History
      • Open-ness
      • The Java Ecosystem
    • Java Syntax and Conventions
      • Java JDK
      • Primitives and Arrays
      • Classes
      • Properties and Methods
      • Comments
      • Java 5
      • Java 6
    • Java 7
      • Language Updates
      • Fork/Join
      • New IO (nio)
      • JVM Benefits
      • Performance Benefits
      • Backwards Compatibility
    • Idiomatic Java 8: Lambdas, Streams, and Dates
      • Lambda Expressions
      • Comparisons to Java 7
      • Default Methods
      • Default and Functional
      • Multiple Defaults
      • Static Methods on Interface
      • Streams
      • For Each
      • Map/Filter/Reduce
      • Parallel Array
      • Peek
      • Limit
      • Sort
      • Collectors and Statistics
      • Grouping and Partitioning
      • Comparisons to Java 7
      • Optional
      • Nashorn
    • New Date and Time API
      • New Classes
      • Creation
      • Enums
      • Clock
      • Period and Duration
      • Temporal Adjusters
      • Instant
      • Time Zones
      • Backwards Compatibility
    • Java 8 Miscellaneous
      • Base64
      • No More Permanent Generation
      • Annotations on Java Types
      • Repeating Annotations
      • Functional Programming in Java 8
      • Backports
    • Advantages of Java 9
      • Language Updates
      • Concurrency
      • Modularity
      • JShell
    • Java 10 and 11
      • Local Variable Types
      • Lambda Expression Local Variable Types
    • Java 12-17
      • Switch Expressions
      • Records
      • Multiline Strings
      • Pattern Matching Instance-of
  • Part II: The Java Ecosystem
    • Ecosystem Overview
      • Continuous Development and Testing
    • Maven
      • What is Maven?
      • Using Maven
      • Starting a New Project
      • Lifecycle
      • Dependencies
      • Properties
      • Executing Code
      • Deploying to Maven Central
    • JUnit
      • What is JUnit?
      • Hamcrest
      • Assumptions
      • Parameterized Tests
      • JUnit Theories
    • Utilizing Essential Libraries
    • Logback
      • Using SLF4J
      • Configuration
      • MDC
    • Hibernate
      • Starting Out
      • Mappings
      • HQL
      • Configuration
      • Find out More
    • Guava
      • Collections
      • Objects
      • Concurrency
      • Functional Programming
      • Optional
      • Other Useful Classes
    • Modern Java Concurrency
      • State of Concurrent Programming in Java
      • Prominent Models for Concurrency
      • Synchronize in Java
      • Java Futures
      • STM in Clojure
      • Actors
      • Groovy GPars
    • RxJava
      • Flowable
      • Parallel Computing
      • Schedulers
      • Publishers
      • Hot and Cold
      • Backpressure
  • Part III: JVM Languages
    • Other JVM Languages
      • Why use non-Java Languages?
      • Polyglot Programming
      • Edge-Craft
      • Groovy vs. Scala
    • Groovy
      • What is Groovy?
      • Compact Syntax
      • List and Map Definitions
      • Easy Properties
      • GString
      • Closures
      • A Better Switch
      • Gotcha’s
      • Command Chains
      • Modules
      • Static Type Checking
      • Invoke Dynamic Support in Groovy
    • The Groovy Ecosystem
      • Web and UI Frameworks
      • Cloud Computing Frameworks
      • Build Frameworks
      • Testing Frameworks/Code Analysis
      • Concurrency
      • Others
    • Gradle
      • Getting Started
      • Projects and Tasks
      • Plugins
      • Configuring a Task
      • Extra Configuration
      • Maven Dependencies
      • Gradle Properties
      • Multiproject builds
      • File Operations
      • Exploring
      • Build Scans
      • Summary
    • Spock
      • Introduction
      • A Simple Test
      • Mocking
      • Lists or Tables of Data
      • Expecting Exceptions
      • Conclusion
    • Scala
      • What is Scala?
      • Hello World
      • Everything’s an object
      • Everything’s an expression
      • Match is Switch on Steroids
      • Traits as Mixins
      • List and Apply
      • Tuples
      • Maps
      • For Expressions
      • A Brief History of Scala
      • Conclusion
    • The Scala Ecosystem
      • Web Frameworks
      • ORM Frameworks
      • Build frameworks
      • Testing frameworks/Code Analysis
      • Concurrency
  • Part IV: The Web
    • RESTful
      • REST in Groovy
      • REST in Scala
      • JAX-RS 1.0
      • JAX-RS 2.0
    • Microservices and Clouds
      • Microservices
      • OSS
      • More Information
      • JVM Clouds
    • Grails
      • What is Grails?
      • Quick Overview of Grails
      • Plugins
      • REST in Grails
      • Short History of Grails
      • Testing
      • Cache Plugin
      • Grails Wrapper
      • Cloud
    • Spark
      • Getting Started
      • Routes
      • Filters
      • Sessions, Cookies, and More
    • Spring Boot
      • Gradle Plugin
      • SpringBootApplication
      • Auto-Cofiguration
      • Actuator
      • Rest Controller
      • Devtools
      • Conclusion
    • Play Framework
      • What is Play?
      • Quick Overview of Play
      • Controllers, Views, Forms
      • ORM
      • Play 1.x
      • Play 2.0
      • Getting Started
    • Ratpack
      • Script
      • Java Main
      • Gradle
      • Ratpack Layout
      • Handlers
      • Rendering
      • JSON
      • Bindings
      • Blocking
      • Configuration
      • Testing
      • Summary
    • Final Thoughts
      • The State of the JVM
      • The Future
      • Contact the Author
    • Appendix: Groovy for Java Devs
    • Appendix: Scala for Java Devs
    • Java 8 Cheatsheet
      • Lambda Syntax
      • Method References
      • Functional Interfaces under java.util.function
    • Contact the Author
  • Notes

Causes Supported

Electronic Frontier Foundation

Defending your civil liberties in a digital world.

Based in San Francisco, EFF is a donor-supported membership organization working to protect fundamental rights regardless of technology.

From the Internet to the iPod, technologies are transforming our society and empowering us as speakers, citizens, creators, and consumers. When our freedoms in the networked world come under attack, the Electronic Frontier Foundation (EFF) is the first line of defense. EFF broke new ground when it was founded in 1990—well before the Internet was on most people's radar—and continues to confront cutting-edge issues defending free speech, privacy, innovation, and consumer rights today. From the beginning, EFF has championed the public interest in every critical battle affecting digital rights.

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