A set of tools for building AJAX apps in the Java language (GWT)

What is Google Web Toolkit (GWT)?
What is GWT?
A set of tools for building AJAX apps in the Java language
What makes GWT interesting?
Write, run, test, and debug everything in Java, both client-side UI
code and server-side business logic
Isn’t that called an applet?
No JVM required; GWT converts your working Java application into
an equivalent pure JavaScript application
So, GWT is a compiler?
GWT’s Java-to-JavaScript compiler is a big part of it, but there’s
really a lot more to the story than that…