The jArt VM can be run just as a standalone application under a host OS (e.g. Linux, MS Windows).
Currently, you can run the jArtVM under Linux or under MS Windows using
cygwin environment.
The Linux/cygwin port of the jArtVM can be found by the download link below.
I've also made some effort to copmile the jArtVM for the VxWorks/Tornado 2 to run Java code under this OS (and I'm still working on this).