Hi ,Thats not the question but if the reason to be SunOs its hardware theres actual Linux distros with good support for Jruby like Debian that can be run on Sparcs machines. I'm running Jruby on AMD64 and X86 platforms over Linux with only a path change as post install and runs fine for me. Also you always have an stable package on Debians main repo thats not the edge release but always runs fine and dont need path touching.