Java EE 8 Application Development

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.

Title Page

Credits

About the Author

About the Reviewers

www.PacktPub.com

Customer Feedback

Preface

Free Chapter

Introduction to Java EE

One standard, multiple implementations

Java EE, J2EE, and the Spring framework

Summary

JavaServer Faces

Introducing JSF

Developing our first JSF application

Custom data validation

Customizing JSF's default messages

Ajax-enabling JSF applications

JSF HTML5 support

JSF 2.2 Faces flows

Injecting JSF artifacts

JSF WebSocket support

Additional JSF component libraries

Summary

Object Relational Mapping with the Java Persistence API

The Customer database

The Java Persistence API

Final notes

Summary

Enterprise JavaBeans

Session beans

Asynchronous method calls

Message-driven beans

Transactions in enterprise JavaBeans

Enterprise JavaBean life cycles

EJB timer service

EJB security

Summary

Contexts and Dependency Injection

Summary

JSON Processing with JSON-P and JSON-B

The JSON-P Model API

The JSON-P Streaming API

JSON pointer

JSON Patch

Populating Java objects from JSON with JSON-B

Generating JSON strings from Java objects with JSON-B

Summary

WebSocket

Developing a WebSocket server endpoint

Developing WebSocket clients

Additional information about the Java API for WebSocket

Summary

Java Messaging Service

Message queues

Message topics

Summary

Securing Java EE Applications

Identity stores

Authentication mechanisms

Summary

RESTful Web Services with JAX-RS

An introduction to RESTful web services and JAX-RS

Developing a simple RESTful web service

Developing a RESTful web service client

Query and path parameters

Server-sent events

Summary

Microservices Development with Java EE

Introduction to microservices

Microservices and Java EE

Developing microservices using Java EE

Summary

Web Services with JAX-WS

Developing web services with JAX-WS

Exposing EJBs as web services

Summary

Servlet Development and Deployment

What is a servlet?

Request forwarding and response redirection

Persisting application data across requests

Passing initialization parameters to a servlet via annotations

Servlet filters

Servlet listeners

Pluggability

Configuring web applications programmatically

Asynchronous processing

HTTP/2 server push support

Summary

Configuring and Deploying to GlassFish

Setting up database connectivity

Setting JMS resources

Summary

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Session beans

Like we previously mentioned, session beans typically encapsulate business logic. In Java EE, only one or two artifacts need to be created in order to create a session bean: the bean itself, and an optional business interface. These artifacts need to be decorated with the proper annotations to let the EJB container know they are session beans.

Note

J2EE required application developers to create several artifacts in order to create a session bean. These artifacts include the bean itself, a local or remote interface (or both), a local home or a remote home interface (or both), and an XML deployment descriptor. As we shall see in this chapter, EJB development was greatly simplified in Java EE.

A simple session bean

The following example illustrates a very simple session bean.:

package net.ensode.javaeebook;

import javax.ejb.Stateless;

@Stateless
public class SimpleSessionBean implements SimpleSession
{ 
  private String message = 
      "If you don't see this, it didn't work!";
...

Java EE 8 Application Development

Java EE 8 Application Development

Overview of this book

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Session beans

Note

A simple session bean