Wonka is ACUNIA's cleanroom Virtual Machine for the Java language. It is extremely portable and self-contained, and can optionally be used with its own real-time executive (OSwald) to provide a complete solution for embedded devices. It is a full implementation of the Java language, not just a subset. And it's Open Source.
You may find the design decisions interesting.
Posted to implementation by Ehud Lamm on 11/12/01; 2:35:39 AM