vaangular combines the power of vaadin and Java with the power of AngularJS to create awesome UIs. Some reasons why you might want to do that: - mix and match skill within your team - increase responsiveness (by doing client-side logic) - re-use existing AngularJS-based assets - have an alternative to custom GWT development you don't have to do any GWT development. Check out all necessary steps here: https://github.com/akquinet/vaangular/