These are NOT really prerequisites, rather the only tested configurations for now. So feel free to use your own tools instead, just don't expect much help on setting it up.
Check out a new project from SVN using the URL on the project page. Do a Maven update project configuration and dependencies, including the snapshots. If you have Oracle and didn't install the Oracle JDBC driver you'll get the respective error, install it now and retry. Run on server.
First use the admin page to upload a fully prepared Excel file (see example in SVN). Simpler that way, but all older polls will be deactivated. This is by design. Then go to the (freshly generated) quiz and start giving answers according to your free will. Whenever you feel like, you can generate the radar chart with your answers. Just remember that unanswered questions will count as a complete neutral answer!
Alternatively, you can to create by hand in the CRUD interface: a poll, a few themes for it and a few questions for each theme.
A demo version can be seen and tried here:
http://radar.elasticbeanstalk.com
Installed on Amazon AWS cloud, where it runs on Linux x32, Tomcat 7, Java 7 and MySQL 5.5.20.