The VAADIN is a web application framework, open source platform and built on GOOGLE Web Toolkit (GWT) written in Java.
The Vaadin Framework is created and supported by Vaadin Ltd, a Finnish company founded 11 YEARS ago and Vaadin licensed under the Apache 2.0 license.
The Vaadin platform includes a big set of web components, application starters, performance, accessibility and tools for building great looking apps faster in Java.
The Vaadin allows the implementation of HTML5 web user INTERFACES using the Java.
The components are built as standard HTML elements that can be used in any framework.
The Vaadin is 100% Java. No JavaScript or any other languages required. You don't need to know any languages other than Java to build great web APPLICATIONS.