Jakarta EE Application Development: Build enterprise applications with Jakarta CDI, RESTful web services, JSON Binding, persistence, and security , Second Edition

David R. Heffelfinger

$39.99

5 (2 Ratings)

Paperback Feb 2024 316 pages 2nd Edition

David R. Heffelfinger

$39.99

5 (2 Ratings)

Paperback Feb 2024 316 pages 2nd Edition

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Jakarta EE Application Development

Contexts and Dependency Injection

Contexts and Dependency Injection (CDI) is a powerful dependency injection framework that allows us to easily integrate different parts of our Jakarta EE applications. CDI beans can have different scopes, allowing their life cycle to be managed automatically by the Jakarta EE runtime. They can be easily injected as dependencies by using a simple annotation. CDI also includes an event mechanism to allow decoupled communication between different parts of our application.

In this chapter, we will cover the following topics:

Named beans
Dependency injection
Qualifiers
CDI bean scopes
CDI events
CDI Lite

Note

Code samples for this chapter can be found on GitHub at https://github.com/PacktPublishing/Jakarta-EE-Application-Development/tree/main/ch02_src.

CDI bean scopes

CDI stands for “Contexts and Dependency Injection,” CDI Beans have a scope which defines their lifecycle, their scope determines when the Jakarta EE runtime creates and destroys CDI beans. “Contexts” in “Contexts and Dependency Injection” refers to CDI scopes. When a CDI bean is needed, either because of injection or because it is referred to from a Jakarta Faces page, CDI looks for an instance of the bean in the scope it belongs to and injects it into the dependent code. If no instance is found, one is created and stored in the appropriate scope for future use. The different scopes are the context in which the bean exists.

The following table lists the different valid CDI scopes:

Scope	Annotation	Description
Request	`@RequestScoped`	Request-scoped...

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Key benefits

Craft microservices using standard Jakarta EE technologies such as Jakarta RESTful Web Services, JSON Processing, and JSON Binding
Design web-based applications with Jakarta Faces
Harness Jakarta EE technologies such as Jakarta Enterprise Beans and Jakarta Messaging to build enterprise applications
Purchase of the print or Kindle book includes a free PDF eBook

Description

Jakarta EE stands as a robust standard with multiple implementations, presenting developers with a versatile toolkit for building enterprise applications. However, despite the advantages of enterprise application development, vendor lock-in remains a concern for many developers, limiting flexibility and interoperability across diverse environments. This Jakarta EE application development guide addresses the challenge of vendor lock-in by offering comprehensive coverage of the major Jakarta EE APIs and goes beyond the basics to help you develop applications deployable on any Jakarta EE compliant runtime. This book introduces you to JSON Processing and JSON Binding and shows you how the Model API and the Streaming API are used to process JSON data. You’ll then explore additional Jakarta EE APIs, such as WebSocket and Messaging, for loosely coupled, asynchronous communication and discover ways to secure applications with the Jakarta EE Security API. Finally, you'll learn about Jakarta RESTful web service development and techniques to develop cloud-ready microservices in Jakarta EE. By the end of this book, you'll have developed the skills to craft secure, scalable, and cloud-native microservices that solve modern enterprise challenges.

Who is this book for?

This book is for Java developers looking to learn Jakarta EE and expand their skill set. You’ll also find this book useful if you are familiar with Java EE and want to stay abreast of the latest version of the Jakarta EE specification. Knowledge of core Java concepts such as OOP, data types, control flow, and basic collections will be beneficial.

What you will learn

Design microservices architectures with a clear separation of concerns
Understand the contexts and dependency injection (CDI) specification to develop Java EE applications
Use Jakarta Faces to create interactive web applications using component-based development
Understand the steps involved in handling JSON data with Jakarta JSON Processing and Binding
Design secure RESTful web services using server-sent events (SSE) for real-time data updates
Secure your applications with the Jakarta Security API
Build message-driven applications with Jakarta Messaging

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David K Jun 24, 2024

As an experienced developer who has navigated the evolving landscape of enterprise Java, I wholeheartedly recommend this book to budding and seasoned professionals. This book is an essential guide for anyone looking to master the Jakarta EE platform and develop robust, scalable enterprise applications.

Amazon Verified review

Amol Gote Jul 08, 2024

My name is Amol Gote, and I have extensive experience building microservices in .NET and Java. "Jakarta Application Development - Second Edition" is a must-read for any Java developer eager to master Jakarta EE or update their Java EE skills. This book comprehensively covers the latest Jakarta EE specifications, such as Jakarta Faces, Jakarta Persistence, and Jakarta Enterprise JavaBeans. The chapters are well-organized, starting with an introduction to Jakarta EE and progressively tackling more complex topics like CDI, JSON Processing, and RESTful Web Services. Each section is packed with practical examples, ensuring readers can see how to apply the concepts in real-world scenarios.What sets this book apart is its clarity and depth. Each chapter delves deeply into its subject matter, providing a robust understanding of foundational and advanced topics. For instance, the chapters on microservices development and securing Jakarta EE applications are particularly insightful, offering valuable frameworks and best practices for modern application development. The authors have done an excellent job updating the content to reflect the latest advancements in Jakarta EE, making this book an indispensable resource for staying current in the field.This book caters to various Java developers, from newcomers to experienced professionals. Those new to Jakarta EE will find the clear explanations and structured learning path particularly helpful, while experienced Java EE developers will appreciate the detailed updates and advanced features. Whether you're developing cloud or traditional applications, this book equips you with the tools and knowledge needed to excel in Jakarta EE development. I highly recommend it for its thoroughness, practical insights, and up-to-date content.

Jakarta EE Application Development: Build enterprise applications with Jakarta CDI, RESTful web services, JSON Binding, persistence, and security , Second Edition

What do you get with Print?

Jakarta EE Application Development

Contexts and Dependency Injection

Named beans

Dependency injection

Qualifiers

CDI bean scopes

CDI events

Firing CDI events

CDI Lite

Summary

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Jakarta EE Application Development: Build enterprise applications with Jakarta CDI, RESTful web services, JSON Binding, persistence, and security , Second Edition

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