Google Web Toolkit - Build AJAX apps in the Java language
New! Mac OS X support and faster debugging
Google Web Toolkit (GWT) is a Java software development framework that makes writing AJAX applications like Google Maps and Gmail easy for developers who don't speak browser quirks as a second language. Writing dynamic web applications today is a tedious and error-prone process; you spend 90% of your time working around subtle incompatibilities between web browsers and platforms, and JavaScript's lack of modularity makes sharing, testing, and reusing AJAX components difficult and fragile.
GWT lets you avoid many of these headaches while offering your users the same dynamic, standards-compliant experience. You write your front end in the Java programming language, and the GWT compiler converts your Java classes to browser-compliant JavaScript and HTML.
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Featured Example Projects
A replica of the UI of a desktop email application.
An application that includes every UI widget GWT supports.
Google Web Toolkit Features
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Create a
Widget by compositing other Widgets. Lay out Widgets automatically in
Panels. Send your Widget to other developers in a JAR file.
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To communicate from your web application to your web server, you just need to define serializable Java classes for your request and response. In production, GWT automatically serializes the request and deserializes the response from the server. GWT's RPC mechanism can even handle polymorphic class hierarchies, and you can throw exceptions across the wire.
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No, AJAX applications don't need to break the browser's back button. GWT lets you make your site more usable by easily adding state to the browser's back button history.
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In production, your code is compiled to JavaScript, but at development time it runs in the Java virtual machine. That means when your code performs an action like handling a mouse event, you get full-featured Java debugging, with exceptions and the advanced debugging features of IDEs like
Eclipse.
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Your GWT applications automatically support IE, Firefox, Mozilla, Safari, and Opera with no browser detection or special-casing within your code in most cases.
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GWT's direct integration with
JUnit lets you unit test both in a debugger and in a browser...and you can even unit test asynchronous RPCs.
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Easily create efficient internationalized applications and libraries.
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