Vaadin is a Java framework for building modern web applications that look greata and perform well. The core software is free and open source. Programmers can simply work with pure Java code and do not worry about technologies such as JavaScript, HTML and Ajax while coding. Vaadin is a server-centric architecture; that means most logic is processed on the server side.
A dashboard demo is available here.

Vaadin website: vaadin.com. You can also find it on GitHub.