Preface:
Most Internet technologies are designed for desktop computers or enterprise servers running on reliable networks with relatively high bandwidth. Handheld wireless devices, on the other hand, have a more constrained computing environment. They tend to have less memory, less powerful CPUs, different input devices, and smaller displays.
Since the mid-1990s, various architectures and protocols have been introduced to deal with these constraints. The Wireless Application Protocol (or WAP), which is a specification developed by the WAP Forum (http://www.wapforum.org), takes advantage of several data-handling approaches already in use. Developing wireless applications using WAP technologies is similar to developing Web pages with a markup language (e.g., HTML or XML) because WAP technologies are browser-based.
Another approach to developing wireless applications is to use the Java 2 Platform, Micro Edition (J2ME ). The Java programming language already plays an important role in modern programming. With WAP, you can use Java servlets and JavaServer Pages to generate Wireless Markup Language (WML) pages dynamically. However, with J2ME, you can now write applications in Java and store them directly on a cell phone. This adds a whole new dimension to wireless programming.
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Introduction
It all started with the article ‘Working with Java – 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 – I would not be a Mac
user if I wasn’t – I wanted an IDE that could help me with my OS X enterprise java stuff, and nowhere in that article was
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’s and their interfaces–all these getters and setters - they can easily be generated from the lay-outs
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’s (just think of GUI-editors, wizards…), it is very good at what it
does, and its performance is acceptable. It is even usable on a Pismo 500 MHz PowerBook, although you’ll better have the
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 ‘stupid code’, I am using a command line tool called
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’ll limit
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 – making sense only when you repeat everything that is
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 – they are what
Microsoft gave me.
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Posted by: Category: java
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| Ajax on Java |
| By Steven Douglas Olson |
| ……………………………………….. |
| Publisher: O’Reilly |
| Pub Date: February 23, 2007 |
| ISBN-10: 0-596-10187-2 |
| ISBN-13: 978-0-596-10187-9 |
| Pages: 228 |
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| Overview: |
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This practical guide shows you how to make your Java web applications more responsive and dynamic by incorporating new Ajaxian features, including suggestion lists, drag-and-drop, and more. Java developers can choose between many different ways of incorporating Ajax, from building JavaScript into your applications “by hand” to using the new Google Web Toolkit (GWT).
Ajax on Java starts with an introduction to Ajax, showing you how to write some basic applications that use client-side JavaScript to request information from a Java servlet and display it without doing a full page reload. It also presents several strategies for communicating between the client and the server, including sending raw data, and using XML or JSON (JavaScript Object Notation) for sending more complex collections of data.
The book then branches out into different approaches for incorporating Ajax, which include:
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The Prototype and script.aculo.us Javascript libraries, the Dojo and Rico libraries, and DWR
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Integrating Ajax into Java ServerPages (JSP) applications
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Using Ajax with Struts
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Integrating Ajax into Java ServerFaces (JSF) applications
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Using Google’s GWT, which offers a pure Java approach to developing web applications: your client-side components are written in Java, and compiled into HTML and JavaScript
Ajax gives web developers the ability to build applications that are more interactive, more dynamic, more exciting and enjoyable for your users. If you’re a Java developer and haven’t tried Ajax, but would like to get started, this book is essential. Your users will be grateful.
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Posted by: Category: java
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| Beyond Java |
| By Bruce A. Tate |
| ……………………………………….. |
| Publisher: O’Reilly |
| Pub Date: September 2005 |
| ISBN: 0-596-10094-9 |
| Pages: 200 |
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| Overview: |
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Bruce Tate, author of the Jolt Award-winning Better, Faster, Lighter Java has an intriguing notion about the future of Java, and it’s causing some agitation among Java developers. Bruce believes Java is abandoning its base, and conditions are ripe for an alternative to emerge.
In Beyond Java, Bruce chronicles the rise of the most successful language of all time, and then lays out, in painstaking detail, the compromises the founders had to make to establish success. Then, he describes the characteristics of likely successors to Java. He builds to a rapid and heady climax, presenting alternative languages and frameworks with productivity and innovation unmatched in Java. He closes with an evaluation of the most popular and important programming languages, and their future role in a world beyond Java.
If you are agree with the book’s premise–that Java’s reign is coming to an end–then this book will help you start to build your skills accordingly. You can download some of the frameworks discussed and learn a few new languages. This book will teach you what a new language needs to succeed, so when things do change, you’ll be more prepared. And even if you think Java is here to stay, you can use the best techniques from frameworks introduced in this book to improve what you’re doing in Java today.
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