Modular Programming in Java 9
Build large scale applications using Java modularity and Project Jigsaw
Published on 8. July 2025
298 pages
978-1-78712-627-5 (ISBN)
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Edition
Digital original
Language
English
Place of publication
Birmingham
United Kingdom
Target group
Professional and scholarly
US School Grade: College Graduate Student
Edition type
Digital original
File size
8,40 MB
ISBN-13
978-1-78712-627-5 (9781787126275)
Copyright in bibliographic data and cover images is held by Nielsen Book Services Limited or by the publishers or by their respective licensors: all rights reserved.
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Koushik Kothagal
Modular Programming in Java 9
Book
08/2017
Packt Publishing
€46.10
Shipment within 3-4 weeks
Person
Koushik Kothagal is the founder of Java Brains, an online training website that offers courses on various enterprise Java and JavaScript technologies entirely for free. He works as a Senior Staff Engineer at Financial Engines. He has over 14 years of professional experience working on full-stack web applications and has worked extensively with technologies such as Java, Spring, Java EE, JavaScript, and Angular. He loves teaching, and when he's not coding Java and JavaScript, he's probably teaching it! He currently lives in the Bay Area.
Content
- Cover
- Copyright
- Credits
- About the Author
- About the Reviewers
- www.PacktPub.com
- Customer Feedback
- Table of Contents
- Preface
- Chapter 1: Introducing Java 9 Modularity
- Modularity in Java
- Rethinking Java development with packages
- The unfortunate tale of a library developer
- The impossible task of a deployment engineer
- The classpath problem
- Java - the 20-year-old code base
- Legacy classes
- Internal APIs
- Java Platform Module System
- Project Jigsaw
- Summary
- Chapter 2: Creating Your First Java Module
- Setting up the JDK
- Switching between JDKs
- Setting up the NetBeans IDE
- Java 9 modules
- Traditional Java code structure
- What is a module?
- Creating a module
- Creating your first Java module
- Compiling your module
- Executing your module
- Creating a module using NetBeans
- The address book viewer application
- Handling possible errors
- Summary
- Chapter 3: Handling Inter-Module Dependencies
- Creating the second module
- Compiling two modules
- Configuring module dependency
- Module versioning
- Rethinking package structure
- Understanding module path arguments
- Revisiting classpath
- Revisiting the classpath problems
- Summary
- Chapter 4: Introducing the Modular JDK
- Examining the legacy JDK
- The JRE structure
- Understanding rt.jar
- The problem with this model
- The attempted solution - Compact profiles
- The state of API encapsulation
- Understanding internal APIs
- The problem with this model
- The attempted solution - Deprecation, warnings, and documentation
- Enter Project Jigsaw
- Platform modularity
- The impact of platform modularity
- Module graph
- The java.base module
- Browsing modules
- Module types
- Examining platform file structure
- Observable modules
- Revisiting the two problems
- Solving the monolithic runtime
- Solving the API encapsulation problem
- Summary
- Chapter 5: Using Platform APIs
- Adding logging ability
- Using an alternative compiler command
- Reading contacts from an XML file
- Removing the hard-coded contact list
- Creating the module
- Coding the XmlUtil class
- Coding the ContactLoader class
- Shared classes
- Dependency leakage
- Consuming the new module
- Adding UI with Java FX
- Creating the module
- Summary
- Chapter 6: Module Resolution, Readability, and Accessibility
- Readability
- Accessibility
- Interface and implementation accessibility
- Split packages
- Tweaking modularity
- Implied readability
- Aggregator modules
- Java platform aggregator modules
- Qualified exports
- Applying the concepts to address book viewer
- Creating a custom aggregator module
- Optimizing module imports
- Optimizing module exports
- Summary
- Chapter 7: Introducing Services
- The problem of coupling
- Understanding services
- The service registry
- Creating and using services
- Implementing sorting services
- Drawing the module graph
- Advanced services
- Supporting singleton and factory providers
- Implementing service priorities
- Service interface provider lookup
- Selective service instantiation
- Services and the module system goals
- Summary
- Chapter 8: Understanding Linking and Using jlink
- Module resolution process
- Module resolution steps
- Examining module resolution in action
- Revisiting the state of the JDK
- Linking using jlink
- The jlink command
- Link phase optimizations and jlink plugins
- Building a modular JAR file
- Summary
- Chapter 9: Module Design Patterns and Strategies
- Designing modules
- Scoping
- Team structure
- Reusability
- Modularizing by concerns
- Modularizing by layers
- Modularizing by change patterns
- Designing API
- Java modules coding patterns and strategies
- Pattern 1 - Public interface, private implementation, and factory class
- Example
- Pattern 2 - Services for multiple dynamic implementations
- Example
- Pattern 3 - Optional dependencies
- Example
- Pattern 4 - Optional dependencies using services
- Example
- Pattern 6 - Bundle model classes as separate sharable modules
- Pattern 7 - Open modules for reflection
- Example
- Pattern 8 - Use tooling for version control
- Pattern 9 - Design for changes
- Pattern 10 - Protect against dependency leakage
- Pattern 11 - Aggregator and facade modules
- Example
- Summary
- Chapter 10: Preparing Your Code for Java 9
- Beginning Java 9 migration
- Introducing the sample Java 8 application
- Using the Java 9 compiler and runtime
- The unnamed module
- Handling non-standard access
- The jdeps tool
- Overriding module behavior
- Understanding the impact
- Recommended strategy
- Summary
- Chapter 11: Migrating Your Code to Java 9
- Understanding the migration goal
- Beginning the migration
- Automatic modules
- Automatic module naming
- Automatic module definition
- Migrating with automatic modules
- Using jdeps to outline module relationships
- Refactoring into smaller modules
- Handling larger codebases
- Migrating libraries
- Reserving library names
- Using jdeps to create module descriptors
- Building libraries for multiple Java versions
- Summary
- Chapter 12: Using Build Tools and Testing Java Modules
- Integrating with Apache Maven
- A Maven refresher
- Using Maven with Java 9 modules
- Working on a multi-module Java 9 Maven project
- Building the multi-module project
- Executing the multi-module project
- Understanding the exec plugin's module path
- Unit testing modules with Java 9
- Testing a Java 9 module
- Integrating with JUnit
- Wrapping up
- Summary
- Index
