Heroku & Maven & Java dynamic web project

Hi Experts,

I created a new java dynamic web project and got it going.  Now I'm trying to deploy to Heroku.

It's saying "Push rejected, failed to detect set buildpack heroku/java" when I "git push heroku master".

I assume it's because I don't have a pom.xml file and I'm not using Maven.  All I know about Mavan is it's something that helps build webapps.

I think these are my options to get this working:
- deploy Heroku's sample application and pull stuff out of my app and insert it into the sample app (that I'm able to deploy)
- fix my webapp to work with Heroku.

What's my best option - or if you can give further pointers, I'd very much appreciate!

Thanks!
Mike