Daemonizing JRuby with Akuma

akuma.rb

require 'rubygems'
require 'java'
require 'akuma-1.7.jar'
require 'jna-3.4.0.jar'

java_import 'com.sun.akuma.Daemon'

d = com::sun::akuma::Daemon.new
if d.daemonized?
  puts "Daemonizing with PID #{$$}"
  d.init
else
  d.daemonize
  exit
end

sleep

shell.txt

Download akuma-1.7.jar and jna-3.4.0.jar from the following sites:
・http://mvnrepository.com/artifact/org.kohsuke/akuma/1.8
・http://mvnrepository.com/artifact/net.java.dev.jna/jna/3.4.0

$ ls 
akuma-1.7.jar	akuma.rb	jna-3.4.0.jar

$ jruby akuma.rb 
Daemonizing with PID 16811
$ jps -vv
16811 Main -Dcom.sun.akuma.Daemon=daemonized -Dfile.encoding=UTF-8 -Djdk.home= -Djruby.home=/Users/nicksieger/Projects/ruby/jruby -Djruby.script=jruby -Djruby.shell=/bin/sh -Djffi.boot.library.path=/Users/nicksieger/Projects/ruby/jruby/lib/native/Darwin -Xmx500m -Xss2048k -Djruby.memory.max=500m -Djruby.stack.max=2048k -Xbootclasspath/a:/Users/nicksieger/Projects/ruby/jruby/lib/jruby.jar
16948 Jps -Dapplication.home=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home -Xms8m