java ebooks

WebStackComponents
ThefollowingcomponentsareinstalledandoptimizedforuseontheOpenSolaris2008.05
platform:
ApacheHTTPdServer2.2.8ApacheistheWebServerthatserveswebpagesinresponseto
requestsfromusers’webbrowsers.
MySQL5.0.45MySQLisarelationaldatabaseengineusedtostoremost
dynamicdata.OpenSolarisOSincludes32bitarchitectureof
MySQLdatabase.MySQLsupportsthefollowingstandard
APIs:
SQL92
SQL99
SQL2003
MySQLalsohasitsownCclientAPIwhichisdeliveredwith
theserver.
PHP5.2.4PHPisaninterpreteddynamicwebpagescriptinglanguage.A
PHPlanguageinterpreterisintegratedintotheApacheWeb
Server.PHPmoduleisintegratedwithMySQLandPostgreSQL
thatprovidesdatabasesupportforApacheHTTP(32and
64-bit),andPre-forkMPM.Thismoduleisalsointegrated
withtheNetBeansIDE.
AboutPHPExtensions
PHPmodulesareintegratedasextensions.Eachofthe
moduleshavearespectiveINIileunder
/etc/php5/5.2.4/conf.ddirectory.ThesePHPextensions
areenabledbydefault.

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Why have the developers of PHP neglected convenient features such as multi-threading,
shared objects and thread synchronization? Obviously, they were aware of such possibi-
lities and they were capable enough to implement them. But they left them out by design.
The underlying idea is !°shared nothing!° architecture. Each request can be regarded as i
it were the only one on the system. Process management and isolation is handled entirely
by the web server. While a number of limitations are inherent to this design, its great
advantage is simplicity.
Another advantage is scalability. It is technically very hard to scale Java applications that
use session objects, as they are live Java Objects that contain code and data. They can be
accessed at any time by any number of processes and ¨C in a cluster ¨C from any number o
cluster nodes. There are solutions to this in the Java world, but they are quite complex and
often ineficient. In PHP, objects do not survive requests. Since every request is handled
independently, it is very easy to distribute PHP applications across many servers for load
balancing or fail over.
Resources opened by PHP also do not live longer than one request. Allocated memory is
released and open connections are closed when the request is complete at the very latest.
As PHP cleans up after completed requests, a badly coded script cannot kill the whole
server.
If you have a background in Java ¨C as does the author ¨C you may not think this is -
ough to build a scalable web application. Yet there are many examples of large, highly
complex projects serving heavy trafic that use PHP. If you adhere to mainstream PHP
practices, you will always be able to ind much larger projects that relect best practices
and have been running successfully for months or years.

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The WHERE Clause
To conditionally select data from a table, a WHERE clause can be added to the
SELECT statement.
SELECT column FROM table WHERE column operator value
With the WHERE clause, the following operators can be used:
=  Equal
<> Not equal
> Greater than
< Less than
>= Greater than or equal
<= Less than or equal
BETWEEN Between an inclusive range
LIKE Search for a pattern
Note: In some versions of SQL the <> operator may be written as !=

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JDBC, often known as Java Database Connectivity, provides a Java API for updating and querying relational databases using Structured Query Language (SQL)JDBC is now at version 2.0, although many databases don!ˉt as yet support all ofthe JDBC 2.0 features!

loading a driver ¨Cwe need a driver to allowour Java program to talk to the DBopening the connection itself
There are two parts to this:

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For live Java training, please see training courses at
http://courses.coreservlets.com/. Servlets, JSP, Struts http://courses.coreservlets.com/. Servlets, JSP, Struts
Classic, Struts 2, JSF 1.x, JSF 2.0, Ajax (with jQuery,
Dojo, Prototype, Ext, etc.), GWT, Java 5, Java 6, Spring,
Hibernate/JPA and customized combinations of topics Hibernate/JPA, and customized combinations of topics.
Taught by the author of Core Servlets and JSP, More
Servlets and JSP and this tutorial Available at public Servlets and JSP, and this tutorial. Available at public
Customized Java EE Training: http://courses.coreservlets.com/venues, or customized versions can be held on-site at your
Servlets, JSP, JSF 1.x & JSF 2.0, Struts Classic & Struts 2, Ajax, GWT, Spring, Hibernate/JPA, Java 5 & 6.
organization. Contact hall@coreservlets.com for details.

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EJB is a framework for building enterprise-scale object-oriented, distributed,
component-based business applications. EJB business applications are written in
Java, are scalable and can be deployed on any platform that supports the 
EJB applications are deployed to and execute under the control of an EJB 
container. The EJB container provides services typically required by enterprise
applications such as security, transaction management, resource pooling, and
systems management.
versions of the technology. Developing business applications is considerably easier
with EJB 3. The handling of persistence in particular has radically changed in EJB
3. Persistence is no longer a service provided by an EJB container but rather by a
Java applications which need to be persisted but which do not require the services
provided by an EJB container can be persisted outside an EJB container by a JPA
persistence provider. In this book we cover JPA as well as the core EJB 3 services.
This book is a concise, example-driven introduction to EJB 3. The best way to learn a
new software technology is by studying and trying out programming examples. In
this book you will see a lot of code and one example after another. We do not assume
any prior knowledge of EJB. However this book does assume at least a couple of
years!ˉ experience of Java and some knowledge of relational database technology.
The examples in this book have been deployed on the GlassFish application
server. GlassFish was chosen primarily because this is the Java EE 5 reference
implementation.

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 Many different people helped make this book possible. Thanks to my agent Neil Salkind for getting this
project off the ground, and to Jenny Watson and Maryann Steinhart at Wiley for helping turn it from a
proposal into a book. Thanks to the technical editor, Raymond Budd, for his attention to detail in
verifying the source code for this book, and the copyeditor, Kathryn Duggan, for her attention to matters
of style and clarity.
Without the Rails community as a whole, this book would have been a lot less interesting and more
difficult. Thanks to David Heinemeier Hansson for creating Rails in the first place, and the entire core
team for the ongoing implementation. Also thanks to people like Dave Thomas and Chad Fowler for
their part in popularizing Rails. The Rails community is enlivened by a fantastic ongoing conversation of
ideas, tutorials, and arguments online. I !ˉ ve tried to acknowledge individual developers and bloggers in
each chapter, and there are too many to list here, but thanks to you all.
At Motorola, a number of managers and co – workers were supportive of my initial attempts to build Rails
projects as well as the beginnings of this book. Special thanks to Greg Bell, Anne – Marie Jolie, MaryAnn
Marks, Jay Marusich, Staszek Salik, Mike Wagner, and Michal Wieja.
Pathfinder has been amazingly supportive of this book, both in concept and in the amount of time spent.
Thanks to Dietrich Kappe and Bernhard Kappe for the opportunity. Anthony Caliendo, Michael King,
Jason Sendlebach, Alice Toth, and Lydia Tripp are all team members who have been supportive of me
and this book. Thanks to all of you.
I !ˉ d like to acknowledge and thank Wally Dodge, who was my AP Computer Science instructor, and is as
responsible as anybody for my choice of career.
I !ˉ m lucky to be part of an amazing and loving family, both immediate and extended. At the risk of
angering everybody else, I !ˉ d like to especially acknowledge my godparents, Nancy and Richard Sher,
and my cousin Dan Sher.
My parents, Donna and Donnie Rappin, have always enthusiastically supported me, no matter where
I chose to go.
My wife, Erin, still and always the best part of my life, made it through this project with grace and
humor. Thank you for everything.
My children, Emma and Elliot, are now old enough to read this for themselves. Hi! You are wonderful
and amazing kids, and I love you both.

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Introduction
It all started with the article °Working with Java (R)C Enterprise Java on Apples website. It showed that enterprise Java on OS X
was possible, that everything worked. But it left me somewhat unhappy. As I am very GUI minded (R)C I would not be a Ma
user if I wasn°Ot (R)C I wanted an IDE that could help me with my OS X enterprise java stuff, and nowhere in that article w
any hint to such an IDE. Secondly, but very related, I want to debug my server code. And last but not least, I do not want to
spend my time writing repetitive code or code that can easily be generated. Just think about EJB-JAR.XML, a good part of
jboss.xml and even the ejb°Os and their interfaces(R)Call these getters and setters – they can easily be generated from the lay-ou
of your database..
Fortunately, I got involved in a big J2EE project, exchanging messages between unrelated services via XML and https. We
choose J2EE as the platform to implement our part of it, and JBoss as our application server.
The environment at work is Windows plus Oracle. For this article, I replaced the Oracle database by MySql, and Windows
by OS X. All the rest stayed the same. If you prefer another database, you can do so. This article describes the necessary steps
to make JBoss work with MySql. Doing this for another database is quite similar. If you want to use Windows or *nix, you
can as well: all the software used trough this article is available on all these platforms.
The IDE used is Eclipse, a free product written by IBM and backed by others (Borland being one of them). Although it lacks
some of the flashy features offered by commercial IDE°Os (just think of GUI-editors, wizards°≠), it is very good at what
does, and its performance is acceptable. It is even usable on a Pismo 500 MHz PowerBook, although you°Oll better have th
fastest dual G4 at hand if you are using it on a daily basis. Eclipse has an extensible plug-in architecture. The integration
with JBoss is handled by such a plug-in to name one. No doubt GUI-editing, EJB-generation and others will be added as
plug-ins later. (If you all register WhereDidAllMyMoneyGo?, I could do this myself).
As stated earlier, MySql is the database system I use. To generate °AEstupid code°O, I am using a command line tool call
Middlegen. JBoss is my application server, Tomcat my webserver. All these tools are available for free under a GNU licence.
Later, I might add a chapter on version control (using CVS), a chapter on XML (using Castor), but currently, I°Oll limi
myself to session and entity beans, and to JSP and servlets.
One last thing: if you do  not know what an EJB is, what the difference is between a session and an entity bean, and what a
local and a remote interface is, I suggest you read the relevant chapters of Suns J2ee tutorial first.
This document is pretty much written as a step-by-step instruction (R)C making sense only when you repeat everything that i
described on your own machine while reading.
Oh yes, one more thing: I did not pay any attention to formatting and layout. Sorry for the ugly headers (R)C they are wha
Microsoft gave me.
Environment
All the stuff described in this article was written and tested on a dual GHz Quicksilver G4 running OS X 10.2.1. 10.2 is a
prerequisite for Eclipse (R)C threads on Apples Java developer mailing list learn that people using 10.1 have difficulties runnin
Eclipse. A second prerequisite is a fast Internet connection. There is over 100 megabytes to download if you want to replay
this article.
I unzipped or unstuffed all downloads with Stuffit Expander. You MUST use Stuffit Expander version 7.0 or later, as earlier
versions make a mess of long filenames.
Everything I downloaded just worked as advertised for me after unstuffing. I do not have any unsupported tools, cracked or
doubtful software or haxy installed, so my system is quite out-of-the-box.
As I am not a command line freak, I did not change the configuration of my terminal application. If you use another shell, I
guess you know enough of Unix to adapt the few Unix commands presented in this document so they work with your shell.
And yes, I have the latest version of Apples developer tools installed. (Don°Ot know if it is required though.

An application’s usability depends on its appearance and behavior–its look and feel. A consistent look and feel helps users learn an application faster and use it more efficiently. In addition, a consistent look and feel helps users learn other applications that share that look and feel.

This book provides guidelines for designing applications with the Java look and feel. All the guidelines are intended to help you create a well-designed application.

Well-designed applications have the following characteristics:

The rest of this chapter describes each of these characteristics, why each is important, and which parts of this book relate to each characteristic.

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For the past decade, “distributed computing” has been one of the biggest buzz phrases in the computer
industry. At this point in the information age, we know how to build networks; we use thousands of
engineering workstations and personal computers to do our work, instead of huge behemoths in glass-
walled rooms. Surely we ought to be able to use our networks of smaller computers to work together on
larger tasks. And we do–an act as simple as reading a web page requires the cooperation of two computers
(a client and a server) plus other computers that make sure the data gets from one location to the other.
However, simple browsing (i.e., a largely one-way data exchange) isn’t what we usually mean when we
talk about distributed computing. We usually mean something where there’s more interaction between the
systems involved.
You can think about distributed computing in terms of breaking down an application into individual
computing agents that can be distributed on a network of computers, yet still work together to do
cooperative tasks. The motivations for distributing an application this way are many. Here are a few of the
more common ones: Computing things in parallel by breaking a problem into smaller pieces enables you to solve larger
problems without resorting to larger computers. Instead, you can use smaller, cheaper, easier-to-
find computers. Large data sets are typically difficult to relocate, or easier to control and administer located where
they are, so users have to rely on remote data servers to provide needed information. Redundant processing agents on multiple networked computers can be used by systems that need
fault tolerance. If a machine or agent process goes down, the job can still carry on.
There are many other motivations, and plenty of subtle variations on the ones listed here.

Assorted tools and standards for assembling distributed computing applications have been developed over
the years. These started as low-level data transmission APIs and protocols, such as RPC and DCE, and
have recently begun to evolve into object-based distribution schemes, such as CORBA, RMI, and
OpenDoc. These programming tools essentially provide a protocol for transmitting structured data (and, in
some cases, actual runnable code) over a network connection. Java offers a language and an environment
that encompass various levels of distributed computing development, from low-level network
communication to distributed objects and agents, while also having built-in support for secure
applications, multiple threads of control, and integration with other Internet-based protocols and services.
This chapter gives an introduction to distributed application development, and how Java can be used as a
tool towards this end. In the following chapters, we’ll start by reviewing some essential background
material on network programming, threads, and security. Then we’ll move into a series of chapters that
explore different distributed problems in detail. Where appropriate, we’ll use RMI, CORBA, or a
homegrown protocol to implement examples. If you are developing distributed applications, you need to
be familiar with all possible solutions and where they’re appropriate; so where we choose a particular tool,
we’ll try to discuss how things would be better or worse if you chose a different set of tools in building
something similar.
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