So this would be matter of using GWT's native JS interface to interact with
the Persevere JavaScript client, right? I thought GWT's provided the
facilities for interacting with a JavaScript client library.
On the server side, I don't think you would need to go through any JS
compilation layer, Persevere has a Java API that you could comunicate with
directly. This would be the primary entry point:
http://persevere.sitepen.com/javadocs/org/persvr/PersevereRuntime.html
Kris