Web 2.0 Development with the Google Web Toolkit
You also can forget about HTML and DHTML (Dynamic HTML, which implies changing the actual source code of the page you are seeing on the fly) and some additional subtle compatibility issues therein. You code using Java widgets (such as text fields, check boxes and more), and GWT takes care of converting them into basic HTML fields and controls. Don't worry about localization matters either; with GWT, it's easy to produce locale-specific versions of code.
There's another welcome bonus too. GWT takes care of the differences between browsers, so you don't have to spend time writing the same code in different ways to please the particular quirks of each browser. Typically, if you just code away and don't pay attention to those small details, your site will end up looking fine in, say, Mozilla Firefox, but won't work at all in Internet Explorer or Safari. This is a well-known classic Web development problem, and it's wise to plan for compatibility tests before releasing any site. GWT lets you forget about those problems and focus on the task instead.
Before installing GWT, you should have a few things already installed on your machine:
Java Development Kit (JDK), so you can compile and test Java applications; several more tools also are included.
Java Runtime Environment (JRE), including the Java Virtual Machine (JVM) and all the class libraries required for production and development environments.
A development environment—Google's own developers use Eclipse, so you might want to follow suit. Or, you can install GWT4NB and do some tweaking and fudging and work with NetBeans, another popular development environment.
GWT itself weighs in at about 27MB; after downloading it, extract it anywhere you like with tar jxf ../gwt-linux-1.5.3.tar.bz2. No further installation steps are required. You can use GWT from any directory.
For this article, I used Eclipse. For more serious work, you probably also will require some other additions, such as the Data Tools Platform (DTP), Eclipse Java Development Tools (JDT), Eclipse Modeling Framework (EMF) and Graphical Editing Framework (GEF), but you easily can add those (and more) with Eclipse's own software update tool (you can find it on Eclipse's main menu, under Help—and no, I don't know why it is located there).
Before starting a project, you should understand the four components of GWT:
To help you build an interface, there is a Web interface library, which lets you create and use Web browser widgets, such as labels, text boxes, radio buttons and so on. You will do your Java programming using those widgets, and the compilation process will transform them into HTML-equivalent ones.
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