Why?
I wanted a self-inspecting Java container.
Build
docker build --rm=true --tag="opyate/azulopenjdk7" .
Run
docker run -v /var/run/docker.sock:/var/run/docker.sock --name azultest -d -i opyate/azulopenjdk7 /bin/bash
It's important to run with the volume, otherwise inspect won't work.