Book Image

Java EE 8 Application Development

Book Image

Java EE 8 Application Development

Overview of this book

Java EE is an Enterprise Java standard. Applications written to comply with the Java EE specification do not tie developers to a specific vendor; instead they can be deployed to any Java EE compliant application server. With this book, you’ll get all the tools and techniques you need to build robust and scalable applications in Java EE 8. This book covers all the major Java EE 8 APIs including JSF 2.3, Enterprise JavaBeans (EJB) 3.2, Contexts and Dependency Injection (CDI) 2.0, the Java API for WebSockets, JAX-RS 2.1, Servlet 4.0, and more. The book begins by introducing you to Java EE 8 application development and goes on to cover all the major Java EE 8 APIs. It goes beyond the basics to develop Java EE applications that can be deployed to any Java EE 8 compliant application server. It also introduces advanced topics such as JSON-P and JSON-B, the Java APIs for JSON processing, and the Java API for JSON binding. These topics dive deep, explaining how the two APIs (the Model API and the Streaming API) are used to process JSON data. Moving on, we cover additional Java EE APIs, such as the Java API for Websocket and the Java Message Service (JMS), which allows loosely coupled, asynchronous communication. Further on, you’ll discover ways to secure Java EE applications by taking advantage of the new Java EE Security API. Finally, you’ll learn more about the RESTful web service development using the latest JAX-RS 2.1 specification. You’ll also get to know techniques to develop cloud-ready microservices in Java EE.
Table of Contents (21 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

CDI events


CDI provides event handling facilities. Events allow loosely-coupled communication between different CDI beans. A CDI bean can fire an event, then one or more event listeners handle the event.

Firing CDI events

The following example is a new version of the CustomerInfoController class we discussed in the previous section. The class has been modified to fire an event every time the user navigates to a new page:

package net.ensode.javaee8book.cdievents.controller; 
 
import java.io.Serializable; 
import javax.enterprise.context.Conversation; 
import javax.enterprise.context.RequestScoped; 
import javax.enterprise.event.Event; 
import javax.inject.Inject; 
import javax.inject.Named; 
import net.ensode.javaee8book.cdievents.event.NavigationInfo; 
import net.ensode.javaee8book.cdievents.model.Customer; 
 
@Named 
@RequestScoped 
public class CustomerInfoController implements Serializable { 
 
    @Inject 
    private Conversation conversation; 
    @Inject 
    private Customer customer...