There is a 'Will it play in app engine' page that tracks libraries that are compatible with Google App Engine (aka GAE): http://groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine?pli=1
Correctly, Wicket is listed as Semi-Compatible. As a project I've been looking through the Wicket codebase locating the pieces that need to change to make it fully compatible. Does it make sense to have a master Jira that tracks the overall 'compatible with GAE' state while making individual issues for the specific changes that reference back to the master issue? Thanks, -Clint Checketts