NanoVM - a portable tiny java vm running on microcontrollers with at least 8k code space, especially Atmel AVR controllers. Robotic examples for the Asuro, the c't-Bot and the Nibo robot are included.
...Existing Java applications can be executed by JCL. Low refactorings to insert distributed JCL maps in your existing code. Portable JCL code for multicore and multicomputer architectures.
SableVM is a clean-room, highly portable and efficient Java virtual machine. Its goals are to be
reasonably small, fast, and compliant with the various specifications (JVM specification, JNI, invocation interface, etc.).