I'm currently running a Vaadin 6.8.2 Java application on Google AppEngine.
Your job is to upgrade it to Vaadin 7.1. No extra functionality required.
The app makes extensive use of forms, which I believe have been changed in Vaadin 7. If you need more details, please inquire.
You can find the app here: [obscured] /
It's in Dutch, but check out ...
Skills: java, vaadin, maven