Hi, I'm pretty new around here but thought I would let you know that this post by Christophe Dufour works. http://blog.dooapp.com/running-tapestry5-maven-on-google-app-engine
You can check it out here: http://tapgae1.appspot.com/ It's pretty much the default tapestry5 maven archetype with a link to Christophe's instructions. I googled for tapestry appengine and there didn't appear to be any recent success stories so thought I'd let you all know. Cheers Chris