Hooray! For the first time ever, my Java open source project (remote object protocol compatible with Twisted's) runs, or at least passes tests, on a totally free platform, gcj 3.3.3 pre0 in Debian.

Also playing with making native jython:

gcj -lreadline -fjni --main=org.python.util.jython /usr/share/java/servlet-2.2.jar \
    /usr/share/java/libreadline-java.jar /usr/share/java/jython.jar -o jython

seemed to do the trick on Debian. Testing it with -O2 and -maltivec to see if it's any faster.