Compiler2 example

pldms@snowball:/tmp/ant-jruby$ jruby -S gem install bitescript
pldms@snowball:/tmp/ant-jruby$ cat file.rb 
require "java"
require "lib/ant.jar"

include_class "org.apache.tools.ant.Task"

class SampleTask < Task
  def execute
    puts "Hello from SampleTask!"
  end
end
pldms@snowball:/tmp/ant-jruby$ jruby -rubygems PATH_TO_JRUBY/tool/compiler2.rb SampleTask SampleTask file.rb 
pldms@snowball:/tmp/ant-jruby$ javap SampleTask
Compiled from "file.rb"
public class SampleTask extends org.jruby.RubyObject{
    static {};
    public SampleTask();
    public org.jruby.runtime.builtin.IRubyObject execute();
}