Java: How to Install GWT in Netbeans

Google Web Toolkit (GWT) is an open source web development framework that allows developers to easily create high-performance AJAX applications using Java. Google Web Toolkit is getting a lot of attention in the web developer community thanks to its interesting way of avoiding the need to write JavaScript code for interactive web applications. You can download this GWT plug-in here and start developing GWT-based applications in NetBeans.

With GWT, you are able to write your front end in Java, and it compiles your source code into highly optimized, browser-compliant JavaScript and HTML. "Writing web apps today is a tedious and error-prone process. You spend 90% of your time working around browser quirks, and JavaScript's lack of modularity makes sharing, testing, and reusing AJAX components difficult and fragile. It doesn't have to be that way," reads the Google Web Toolkit site.

In this tutorial, you learn how the above principles are applied to real applications. At the same time, you are introduced to NetBeans IDE's support for GWT and you build a simple application that makes use of some of these features.
1. Download GWT plugin here
2. Install the plug-in using the Plug-in manager. Go to the "Tools | Plugins" menu action, switch to the "Downloaded" tab and locate the plug-in on your disk drive.
You don't even have to restart your IDE - GWT support is instantly available for you!

Creating the Source Structure of a GWT Application
1. Choose File > New Project (Ctrl-Shift-N). Under Categories, select Web (or Java Web). Under Projects, select Web Application. Click Next.
2. In step 2, Name and Location, type HelloGWT in Project Name. You can also specify the location of the project by typing in a path on your computer in Project Location field. Click Next.
3. In the Server and Settings step, select any server that you have registered in the IDE. If you included Tomcat or the GlassFish server when installing the IDE, they display in the drop-down list.
4. Specify the Java version you are using. Click Next.
5. In the framework Step, select GWT:

6. click finish.
7. In the Projects window, right-click the project node and choose Run. The application is built and a web archive (WAR) is created. It is deployed to the server. The server starts, if it is not running already. Your computer's default browser opens and the welcome page of the application is displayed.

source : http://netbeans.org/kb/docs/web/quickstart-webapps-gwt.html