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Robbie Vanbrabant

Google

Guice

Agile Lightweight Dependency

Injection Framework

EMPOWERING PRODUCTIVITY FOR THE JAVA

™

DEVELOPER

Google Guice: Agile Lightweight

Dependency Injection Framework

Dear Reader,

This book welcomes you to the world of Google Guice (pronounced “juice”), the latest

and greatest dependency injection framework that fully exploits all modern Java

™

features. One step at a time, this book will help turn any XML-spitting programmer

into a true Guice master, or a “Bob,” as I like to say.

I’m particularly proud of this book’s coverage. To make sure that nobody gets left

behind, I start out with an introduction to dependency injection concepts. From

there, you will learn how Guice makes your life easier, and you’ll gradually become a

Guice expert. Beyond that, I also devoted two chapters to web application development

with Struts 2 and Wicket, including content on how to organize your application and

how to use Warp Persist, a popular Guice extension, to access your data using the Java

Persistence API and Hibernate.

Writing this book was not an easy task, so in addition to Apress, I’d like to thank

some people in particular. First, I would like to thank Dhanji R. Prasanna for referring me

to Apress to write this book. He has also done a fantastic job as my technical reviewer.

I’d also like to thank Bob Lee, the inventor of Guice, who kindly answered all of my

questions and inspired much of the content in Chapter 8. Finally, a big thank you goes

out to my friends, my parents, my brother, and anyone who believes in me; you are

the people who put the smile on my face.

Now, put on your Batman or Catwoman costume; open up a bottle of wine; pick up

this book; and put your feet up. Be a Java hero, and may Guice help you on your way.

Just don’t forget to send me a picture of you in that getup.

Robbie Vanbrabant

http://garbagecollected.org

Vanbrabant

Google Guice

Apress’s firstPress series is your source for understanding cutting-edge technology. Short, highly

focused, and written by experts, Apress’s firstPress books save you time and effort. They contain

the information you could get based on intensive research yourself or if you were to attend a

conference every other week—if only you had the time. They cover the concepts and techniques

that will keep you ahead of the technology curve. Apress’s firstPress books are real books, in your

choice of electronic or print-on-demand format, with no rough edges even when the technology

itself is still rough. You can’t afford to be without them.

this print for content only—size & color not accurate spine = 0.408" 192 page count

User level:

Intermediate

www.apress.com

java.apress.com

SOURCE CODE ONLINE

180

PAGES

Available as a

PDF Electronic Book

or Print On Demand

About firstPress

Apress's firstPress series is your source for understanding cutting-edge technology. Short,

highly focused, and written by experts, Apress's firstPress books save you time and effort. They

contain the information you could get based on intensive research yourself or if you were to

attend a conference every other week—if only you had the time. They cover the concepts and

techniques that will keep you ahead of the technology curve. Apress's firstPress books are real

books, in your choice of electronic or print-on-demand format, with no rough edges even when

the technology itself is still rough. You can't afford to be without them.

Google Guice: Agile Lightweight

Dependency Injection Framework

Dear Reader,

This book welcomes you to the world of Google Guice (pronounced “juice”), the latest and

greatest dependency injection framework that fully exploits all modern Java™ features. One

step at a time, this book will help turn any XML-spitting programmer into a true Guice master,

or a “Bob,” as I like to say.

I’m particularly proud of this book’s coverage. To make sure that nobody gets left behind, I

start out with an introduction to dependency injection concepts. From there, you will learn how

Guice makes your life easier, and you’ll gradually become a Guice expert. Beyond that, I also

devoted two chapters to web application development with Struts 2 and Wicket, including

content on how to organize your application and how to use Warp Persist, a popular Guice

extension, to access your data using the Java Persistence API and Hibernate.

Writing this book was not an easy task, so in addition to Apress, I’d like to thank some people

in particular. First, I would like to thank Dhanji R. Prasanna for referring me to Apress to write

this book. He has also done a fantastic job as my technical reviewer. I’d also like to thank Bob

Lee, the inventor of Guice, who kindly answered all of my questions and inspired much of the

content in Chapter 8. Finally, a big thank you goes out to my friends, my parents, my brother,

and anyone who believes in me; you are the people who put the smile on my face.

Now, put on your Batman or Catwoman costume; open up a bottle of wine; pick up this book;

and put your feet up. Be a Java hero, and may Guice help you on your way. Just don’t forget to

send me a picture of you in that getup.

Robbie Vanbrabant

http://garbagecollected.org

    Google Guice: Agile Lightweight Dependency Injection Framework  i 
 
 
Contents
 
Chapter 1: Setting the Stage ......................................................................................... 1 
The Problem................................................................................................................................... 1 
A Fortunate Example .................................................................................................................... 3 
Dependency Injection.................................................................................................................... 5 
DI, Guice Style .............................................................................................................................. 8 
Summary ...................................................................................................................................... 10 
Chapter 2: Enter Guice .............................................................................................. 11 
Getting Guice............................................................................................................................... 11 
Preparing the Code ...................................................................................................................... 12 
Specifying an Implementation.................................................................................................... 15 
Bootstrapping............................................................................................................................... 15 
Choosing Between Implementations.......................................................................................... 17 
Implicit Bindings ......................................................................................................................... 21 
Scoping......................................................................................................................................... 22 
Debunking Myths ........................................................................................................................ 23 
Summary ...................................................................................................................................... 27 
Chapter 3: From Journeyman to Bob ......................................................................... 29 
Providers ...................................................................................................................................... 29 
@Named ...................................................................................................................................... 32 
Binding Constants ....................................................................................................................... 34 
Binding Generic Types ............................................................................................................... 38 
Properties ..................................................................................................................................... 42 
Static Injection ............................................................................................................................. 44 

ii  Google Guice: Agile Lightweight Dependency Injection Framework     
Custom Scopes ............................................................................................................................ 45 
Web Scopes.................................................................................................................................. 49 
Organizing Modules .................................................................................................................... 51 
The Binding EDSL ...................................................................................................................... 53 
How Guice Resolves Dependencies........................................................................................... 56 
Summary ...................................................................................................................................... 57 
Chapter 4: Aspect-Oriented Programming ................................................................. 59 
AOP for Mere Mortals ................................................................................................................ 60 
How Guice AOP Works.............................................................................................................. 60 
Method Interception .................................................................................................................... 61 
Phoning Home ............................................................................................................................. 64 
Summary ...................................................................................................................................... 69 
Chapter 5: Integrating with the Web........................................................................... 71 
The Integration Challenge........................................................................................................... 71 
Bootstrapping............................................................................................................................... 72 
Inviting Servlets to the Club ....................................................................................................... 73 
Configuration Discovery............................................................................................................. 74 
Struts 2 ......................................................................................................................................... 76 
Wicket .......................................................................................................................................... 78 
Where Are the Web Scopes? ...................................................................................................... 85 
Warp Servlet ................................................................................................................................ 86 
Summary ...................................................................................................................................... 92 
Chapter 6: Practical Guice......................................................................................... 93 
Requirements ............................................................................................................................... 93 
The Big Picture ............................................................................................................................ 95 
Project Structure .......................................................................................................................... 99 
Setting Up Struts 2 .................................................................................................................... 103 
Getting Guiced........................................................................................................................... 104 
76a2626bcfb21763948a3d635f6fe985

    Google Guice: Agile Lightweight Dependency Injection Framework  iii 
Defining the Model ................................................................................................................... 105 
Database Access with Warp Persist ......................................................................................... 109 
Implementing the Data Access Layer ......................................................................................111 
The Home Screen ...................................................................................................................... 118 
The Create and Edit Screens..................................................................................................... 121 
Unit Testing ...............................................................................................................................123 
Summary .................................................................................................................................... 125 
Chapter 7: Guice Recipes ......................................................................................... 127 
Sharing Singletons..................................................................................................................... 127 
Binding Collections...................................................................................................................129 
Designing Libraries and Limiting Visibility............................................................................ 136 
Viral Annotations ...................................................................................................................... 138 
Mixing Scopes ........................................................................................................................... 139 
Integrating Spring...................................................................................................................... 142 
Logging ...................................................................................................................................... 145 
Integrating JNDI........................................................................................................................146 
Using JMX................................................................................................................................. 147 
Summary .................................................................................................................................... 150 
Chapter 8: The Future.............................................................................................. 153 
The Grand Plan .......................................................................................................................... 153 
Growing an Extensible Platform .............................................................................................. 15 4 
Better Up-Front Checking......................................................................................................... 155 
Keeping Guice Simple and Making It Simpler ....................................................................... 156 
Improved Tooling Support........................................................................................................ 158 
Addressing DI Shortcomings....................................................................................................160 
Standardization .......................................................................................................................... 164 
Summary .................................................................................................................................... 166 