EJB 3实战第二版：核心技术与案例详解

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"《EJB 3 in Action》第二版是一本由Manning出版社出品的专业IT书籍，主要关注Java企业应用开发框架（Enterprise JavaBeans，EJB）的第三版实践指南。该书由Debu Panda、Reza Rahman、Ryan Cuprak、Michael Remijan等多位作者共同编写，针对EJB 3.0的最新标准进行了深入探讨。作为第一版的续作，它得到了业内专家的高度评价，如Jeanne Boyarsky赞誉其实用性和娱乐性，认为它是学习EJB的最佳资源。书中的内容覆盖了EJB 3.0的方方面面，包括Java数据对象（JDO，JSR 243）的使用，不仅详尽解释了EJB规范，还提供了大量的实战建议。作者在写作时充分考虑了广泛的读者群体，避免了技术术语的堆砌，采用了轻松、幽默且易于理解的语言风格，并通过案例研究的方式，从入门到进阶，逐步介绍了复杂的概念，如拦截器（interceptors）、事务管理、安全、Java Persistence API（JPA）以及性能优化。书中精心设计了一个案例研究，通过实际场景展示如何开发和应用EJB 3.0的各种特性，使读者能够逐步掌握并应用这些技术。整体而言，《EJB 3 in Action》第二版是一本既全面又易懂的著作，对想要深入理解并实践EJB 3.0开发者来说是一本非常有价值的参考书籍。无论你是初学者还是经验丰富的开发者，这本书都能为你提供清晰的指导，帮助你在Java企业应用开发领域取得成功。对于那些寻求最新EJB技术细节和实践经验的读者，这本书无疑是一个不可或缺的资源。" 由于本书的英文原版无水印，确保了阅读体验的同时也维护了版权，适合用FoxitReader、PDF-XChangeViewer、SumatraPDF等工具打开阅读，且在Firefox上也能正常显示。如果你需要更深入的技术细节或案例分析，可以在美国亚马逊网站上查找更多评论和购买链接。"

preface

In its early days,

EJB

was inspired by the distributed computing ideas of technologies

such as

CORBA

and was intended to add scalability to server-side applications.

EJB

and

J2EE

enjoyed some of the greatest buzz in the industry during the dot.com boom.

The initial goal for

EJB

was to provide a simpler alternative to

CORBA

through the

benefits of a standard development framework and reusable components. By the time

EJB

2 was released, it became apparent that the

EJB

framework could become the new

standard for server-side development. The framework provided Enterprise developers

with everything they needed—remoting, transaction management, security, state main-

tenance, persistence, and web services—but it was heavyweight, requiring developers

to focus more on the framework itself than on the requirements of their business

applications. Because

EJB

was loaded with more features, its inventors failed to address

its growing complexity.

As the community became disenchanted with the limitations of

EJB

2, innovative

open source tools emerged. These tools were signs of the increasing discontent with

the complexities of Java

. Though well-intentioned, these tools made Enterprise

development even more complex since they deviated from the standards of the appli-

cation server they were to run in. It was time for the Java Community Process (

JCP

)

and expert groups to work on the simplification of Java

development. That was the

sole motivation behind Java

5 and the goal of the

EJB

3 expert group.

For a technology with a wide deployment base, the changes that came with

EJB

were nothing short of stunning.

EJB

3 successfully melds innovative techniques to

make component development as easy as possible. These techniques include the use

PREFACE

xvi

of annotations, metadata programming, dependency injection, AspectJ-like intercep-

tors, and intelligent defaulting. The heavyweight inheritance-based programming

model was abandoned in favor of Plain Old Java Object (

POJO

) programming, and

the verbose

XML

descriptor was now out of the developer’s way.

The changes to the persistence model were particularly dramatic.

EJB

3 left behind

the flawed

EJB

2 Entity Beans model in favor of the lightweight Java Persistence

API

(

JPA

). Unlike Entity Beans,

JPA

is not container-based. It has more in common with

open source object relational mapping (

ORM

) tools that emerged in the community

in response to Entity Beans complexity.

JPA

can be used either inside or outside a Java

Enterprise server and is now the de facto persistence standard for Java. Its Java Persis-

tence Query Language (

JPQL

) standardizes object relational queries but also supports

native

SQL

queries if the need arises.

The changes made in

EJB

3 have been well received in the Java community. Its sim-

plified specification has led to its wide adoption in new projects. More and more com-

panies are giving the once “ugly”

EJB

technology another look and they like what they

see. With the release of

EJB

3.2, the adoption will continue to grow.

EJB

3.2 has made

support for

EJB

2 optional so that older technology can finally be sunset and innova-

tions in

EJB

3 can continue to grow.

EJB

3.2 has also seen major enhancements to

message-driven beans (

MDB

s), making messaging much easier.

EJB

3.2 made improve-

ments to stateful session bean passivation and session bean local interfaces, as well as

dramatic improvements to the timer services. All this and more await you in

EJB

3.2.

Since

EJB

POJO

-based, every Java developer can easily become an

EJB

developer.

Simple annotations give your business logic safe transaction management, security,

and exposure as web services for easy interoperability in your company. We strive to

keep our book different from other books on

EJB

by providing practical examples,

best practices, and tips for performance tuning. We highlight what’s new in the

EJB

3.2

specification, which gives you more tools for your development. We hope this revised

edition will help you to quickly learn how to use

EJB

3 effectively in your next Enter-

prise application.

ACKNOWLEDGMENTS

xviii

EBU

ANDA

I’d like to thank my wife, Renuka, for her immense support and continuous encour-

agement and for her patience with all the late nights, early mornings, and weekends

that I spent on the first edition of the book. I’d also like to thank my kids, Nistha and

Nisheet, who had to share their bapa with the computer during that time.

Many thanks to my coauthors Reza Rahman, Ryan Cuprak, and Michael Remijan,

who worked hard on the second edition of the book.

EZA

AHMAN

A journey of a thousand miles begins with a single step.

—Lao-tzu

When I decided to take on writing the first edition of this book, I don’t think any of

the authors were certain how successful the book was going to be or where it might

take us personally. Today I have the luxury of hindsight in saying the book has been a

resounding success and that writing it was the first step of a whirlwind journey over the

past few years that I could have never foreseen. I must confess I continue to enjoy

every minute of it. Since finishing the first edition, I’ve become increasingly more

engaged with the Java community. I’ve contributed to various Java

expert groups,

including the

EJB

expert group, had the once-in-a-lifetime opportunity to write an

open source

EJB

container almost from scratch, and now find myself at the forefront

of the Java

evangelism team at SunOracle.

One casualty of all of this has been my own personal bandwidth, which was more

abundant when I wrote the first edition. This is a large part of why we had to skip a

Java

6 and

EJB

3.1 edition of this book. I do think it’s all for the best since Java

7 is

an even stronger and more compelling platform, as this edition will demonstrate. I’m

extremely grateful to Michael and Ryan for taking ownership of the book and being

instrumental in producing a worthy second edition. I’m also grateful to the many

folks like you in the Java

community that I’ve had the privilege to serve and work

with. Lastly, I’m ever thankful to my wife Nicole and daughter Zehra for allowing me

to pursue my passion without reservation. And so the journey continues.

YAN

UPRAK

Writing this book would not have been possible without the support of family and

friends. I’d especially like to thank the love of my life, Elsa, who has supported and

encouraged me throughout the long, arduous process and the many long nights I was

hunched over the computer. Finally, I’d like to thank Reza for recruiting me to this

project and encouraging me to take a second look at Java

many years ago.

ICHAEL

EMIJAN

My wonderful wife Kelly and my daughter Sophia are the first people I need to thank

when it comes to writing this book. It’s one of many adventures we’ve shared together,

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