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.
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.).