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I've just published a new add-on that allows you to render Vaadin UIs in Facelets-based JSF applications: JSF Integration.
The idea is that you can insert Vaadin UIs in your XHTML files, like this:
<html ... xmlns:vaadin="http://vaadin.com/jsf">
I implemented two example applications: jsf-vaadin-example and appfuse-vaadin-example.
Hope you find it usefull. Feedback is wecome!