Heroku Java support is something I longed for, but they apparently don't support deploying a plain, old war file to Heroku.
I don't like that; I've got my own continuous integration setup, and I want to compile my files on my own box - this allows me to keep my own Maven proxy with my own dependencies - which sometimes are patched versions of public ones - so that I don't need to push everything on a public repo. I don't want to be forced to build everything on Heroku, and I don't want to compile anything I push - I'd usually push to Heroku stable versions only, or maybe integration versions that pass unit, integration and acceptance tests.
So what? Don't worry, deployment is possible.
Setup an heroku-aware git repository and a Cedar stack app, and add the files you see above; your dir structure should look like:
Now a simple
git push heroku master
Should do the trick, and let you see your fully deployed war app.
There're still things you need to be aware of; file persistence may not work as expected, since filesystem is ephemeral, and I still need to figure out things related to database configuration, but those should not come at a great expense.
I'll post updates in the future as soon as I get them right.