Java for Z80
I am glad to notify you that I have published my open tool (a maven plugin) which allows to translate compiled Java classes into Z80 instructions. Of course it allows to develop in Java with some restrictions but anyway it shows that it is possible to develop software in Java for 8bit weak CPU. It is not a JVM implementation, it produces static code.
the project page is http://code.google.com/p/j2z80/
Please keep in mind that it is an experimental pet project.