I wouldn't target *just* Java, but instead use "running on the JVM". Scala, Ruby and other languages running on the VM are getting more common. I wouldn't stretch as far as "running on a VM", where the future might include CLR. IMO that is a whole new project, which would be challenging to say the least :-)
It may actually be feasible via Mono: http://www.mono-project.com/Java But that's also a pretty big stretch. :-)
