A few days back, Classpath 0.90 was released, the first release after the 0.20 release. Earlier Classpath releases could run the rendering engine, but running the application failed so far.
Today it hit Debian unstable, so upgrade my sid32 chroot and had Cacao run Jmol. I had some memory issues opening a small molecule , and the rendering speed was a factor 100 or so slower than Sun's JVM, but it runs!
Using the command cacao -Xmx512M -jar Jmol.jar triplebond.mol I got:
Note the exceptions copied to the console. I'll paste the full stack trace as a comment.
Many thanx to the Classpath team!