Java EE 7 First Look

Table of Contents

Java EE 7 First Look

Credits

About the Author

About the Reviewers

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Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. What's New in Java EE 7

A brief history of Java EE

The main goals of Java EE 7

Productivity

HTML5 support

Novelties of Java EE 7

Summary

2. New Specifications

Concurrency Utilities for Java EE 1.0

Why concurrency?

Benefits of concurrency

Risks of concurrency

Concurrency and Java EE

Java EE Concurrency API

Batch Applications for Java Platform 1.0

What is batch processing?

Why a dedicated API for batch processing?

Understanding the Batch API

JobRepository

Job

Step

Chunk

Batchlet

The batch.xml configuration file

JobOperator

Java API for JSON Processing 1.0

What is JSON?

Object

Array

Value

Why JSON?

Java API for JSON processing

The streaming API

The object model API

Java API for WebSocket 1.0

What is WebSocket?

Why WebSocket?

The WebSocket API

Server endpoint

Client endpoint

Summary

3. The Presentation Layer

Servlet 3.1

What is a Servlet?

A login page with a Servlet

Latest improvements of Servlet 3.1 in action

Non blocking I/O API

Protocol upgrade processing

Expression Language 3.0

What is Expression Language?

The latest improvements of EL 3.0 in action

API for standalone environments

Lambda expressions

Collection object support

Collection object construction

Collection operations

String concatenation operator (+=)

Assignment operator (=)

Semi-colon operator (;)

Static fields and methods

JavaServer Faces 2.2

What is JavaServer Faces?

An identification page with JSF

The latest improvements of JSF 2.2 in action

HTML5-friendly markup

Pass-through attributes

Pass-through elements

Resource Library Contracts

Faces Flow

Stateless views

Summary

4. The Java Persistence API

Java Persistence API 2.1

JPA (Java Persistence API)

JPA in action

The latest improvements of JPA 2.1 in action

Persistence context synchronization

Entity

New annotations

Entity graphs

Static or named entity graphs

Dynamic entity graphs

JPQL

Support for stored procedures

New reserved identifiers

Support for creating named queries at runtime

The Criteria API

Support for bulk update/delete

Support for new reserved identifiers

DDL generation

Java Transaction API 1.2

The Java Transaction API

JTA in action

Innovations introduced by JTA 1.2

Summary

5. The Business Layer

Enterprise JavaBeans 3.2

Pruning some features

The latest improvements in EJB 3.2

Session bean enhancement

EJB Lite improvements

Changes made to the TimerService API

Harmonizing with JMS's novelties

Other improvements

Putting it all together

Presenting the project

Use Case Diagram (UCD)

Class diagram

Component diagram

Summary

6. Communicating with External Systems

JavaMail

Sending e-mails in Java

Sending an e-mail via the SMTP protocol

The latest improvements in action

The added annotations

The added methods

The changing of some access modifiers

Java EE Connector Architecture (JCA)

What is JCA?

JCA in action

Latest improvements

Java Message Service (JMS)

When to use JMS

The latest improvements in action

New features

Sending messages asynchronously

Delivery delay

Handling of the JMSXDeliveryCount message property

Simplification of the API

Java API for RESTful Web Services

When to use Web Services

JAX-RS in action

The latest improvements in action

The Client API

Asynchronous processing

Filters and entity interceptors

Filters

Entity interceptors

Summary

7. Annotations and CDI

Common annotations for the Java platform

The goal of this specification

Building your own annotation

Latest improvements in action

The new annotation

Contexts and Dependency Injection

What is CDI ?

Example 1 – instantiation of a POJO

Example 2 – accessing an EJB from a JSF page

Example 3 – setting a bean with a specific scope for simple operations

Example 4 – use of objects usually created by a factory

Latest improvements in action

Avoiding CDI processing on a bean

Accessing the non contexual instance of a bean

Accessing the current CDI container

Destroying CDI bean instances explicitly

Summary

8. Validators and Interceptors

Bean Validation

Validating your data

Building a custom constraint

Creating a constraint annotation

Implementing a validator

Latest improvements in action

Openness

Support for dependency injection and CDI integration

Support for method and constructor validation

Support for group conversion

Support message interpolation using expression language

Interceptors

Intercepting some processes

Defining interceptors in the target class

Defining interceptors in an interceptor class

Latest improvements in action

Intercept constructor invocation

Associating an interceptor with a class using interceptor binding

Creation of interceptor binding types

Declaring interceptor binding

Binding an interceptor by using interceptor binding type

Defining the execution order of interceptors

Summary

9. Security

JASPIC 1.1

Secure access to forms

Implementing an authentication module

Implementing the ServerAuthModule interface

Installing and configuring the authentication module

Binding the authentication module to a web application

Creating a realm

Security configuration

The latest improvements in action

Integrating the authenticate, login, and logout methods called

Standardizing access to the application context identifier

Support for forward and include mechanisms

Summary

Index

Java EE 7 First Look

Java EE 7 First Look

Copyright © 2013 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: November 2013

Production Reference: 1121113

Published by Packt Publishing Ltd.

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ISBN 978-1-84969-923-5

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Cover Image by Abhishek Pandey (<[email protected]>)

Credits

Author

NDJOBO Armel Fabrice

Reviewers

Markus Eisele

E.P. Rama krishnan

Acquisition Editors

Sam Birch

Joanne Fitzpatrick

Commissioning Editor

Mohammed Fahad

Technical Editors

Ritika Singh

Nikhita K. Gaikwad

Project Coordinator

Ankita Goenka

Proofreader

Christopher Smith

Indexer

Monica Ajmera Mehta

Graphics

Yuvraj Mannari

Production Coordinator

Shantanu Zagade

Cover Work

Shantanu Zagade

About the Author

NDJOBO Armel Fabrice is a Design Computer Engineer and graduate from the National Advanced school of Engineering Cameroon, and Oracle Certified Expert, Java EE 6 Java Persistence API Developer. In the past, he has worked with Java EE to develop several systems among which are a helpline system and a commercial management application. He currently works on several systems based on EJB, Spring and ICEFaces solutions. In addition, he has made a technical review of the books Pro Spring Integration published by Apress and Beginning EJB 3, Java EE published by Apress. He is also a copywriter in developpez.com (his home page is: http://armel-ndjobo.developpez.com/).

First of all, I want to thank the Lord Jesus who makes everything possible for me. I would like to thank Dr. Georges Edouard Kouamou for making me love Software Engineering. I would like to thank Fomba Ken Collins for his critiques that have helped me improve the quality of the book. I would also like to thank Serge Tsala, Armel Mvogo, and my fiancée Ines Tossam who encouraged me during the writing of this book. And finally, I would like to express my gratitude to Licel Kenmue Youbi for all his efforts.

About the Reviewers

Markus Eisele is a Principal Technology Consultant working for msg systems AG in Germany. He is a Software Architect, a Developer, and a Consultant. He also writes for IT magazines. He joined msg in 2002 and has been a member of the Center of Competence IT-Architecture for nine years. After that he moved on to the IT-Strategy and Architecture group. He works daily with customers and projects dealing with Enterprise-level Java and infrastructures. This includes the Java platform and several Web-related technologies on a variety of platforms using products from different vendors. His main areas of expertise are Java EE Servers. He speaks at different conferences about his favorite topics. He is also part of the Java EE 7 expert group.

Follow him on twitter.com/myfear or read his ramblings with Enterprise level software development at http://blog.eisele.net.

E.P. Rama krishnan is an enthusiastic freelance developer and a technical writer. He has steady industry exposure of 5 years. His areas of expertise include JSF (JavaServer Faces), Java Persistence API, CDI, RESTful Services, Swings, Tomcat Clustering, and Load-balancing. His other areas of interest are Linux, Android, and Systems security. Besides development his major interest lies in writing technical blogs which simplify the latest technologies for early adopters. You are welcome to visit his blog at http://www.ramkitech.com and feel free to give your feedback. He can be reached at .

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Preface

When we considered writing this book, the main objective was to present the new features of Java EE 7 platform. But while writing, we came to realize that it would be interesting to make a clear and concise presentation of the relevant specifications and how to implement them. This led us to imagine a project that will help present almost all the specifications affected by Java EE 7 and how to put them together in order to build a large-scale application.

In short, this book does not aim to show how to implement the different aspects of each Java EE 7 specification or list the best practices. Rather, it positions itself similar to the yellow pages for a city that has been built recently. In other words, this book will help you discover the innovations introduced by Java EE 7 and give you ideas to build solid applications.

What this book covers

Chapter 1, What's New in Java EE 7, gives an overview of the improvements made in the Java EE 7 platform.

Chapter 2, New Specifications, explains concepts concerning the new specifications that have been added in Java EE 7 and shows how they can be used.

Chapter 3, The Presentation Layer, demonstrates the implementation of the improvements brought by the Java EE 7 platform for the presentation layer specifications.

Chapter 4, The Java Persistence API, shows how your Java application can store and retrieve data from the database in a safe way and explains the innovations that have been made in the relevant specifications.

Chapter 5, The Business Layer, begins by giving a presentation of the improvement in the business layer and then demonstrates how various Java EE 7 specifications can be put together for the realization of an application.

Chapter 6, Communicating with External Systems, demonstrates how a Java EE 7 application can interact with heterogeneous systems.

Chapter 7, Annotations and CDI, explains how annotations and CDI can be used to improve the quality of applications.

Chapter 8, Validators and Interceptors, shows how the validation and interception of data can be implemented in a Java EE environment to ensure the quality of the data handled by an application.

Chapter 9, Security, demonstrates the implementation of security and setting up a personal module for security in Servlet and EJB containers.

What you need for this book

To implement the various examples present in this book, you will need the following software:

NetBeans IDE 7.3.1 or higher

JDK 7

GlassFish Application Server 4, at least b89

MySQL 5.5 or higher DBMS

Who this book is for

Given the main objectives, this book targets three groups of people who possess knowledge about Java. They are:

Beginners in using the Java EE platform who would like to have an idea about the main specifications of Java EE 7

Developers who have experimented with previous versions of Java EE and want to know what Java EE 7 has brought as novelties

Budding architects who want to learn how to put