Rakefile for combining into a jar

Rakefile3

directory 'vendor'

desc 'Install Ruby gems into vendor/'
task :install_gems => 'vendor' do
  sh 'jruby -S gem install -i vendor rubyzip'
end

desc 'Build Java launcher that will start the Ruby program'
task :build_launcher do
  sh 'javac -cp jruby-complete.jar JavaLauncher.java'
end

desc 'Combine app and launcher into one jar'
task :my_jar => [:install_gems, :build_launcher] do
  sh 'jar -cfm compress.jar my.manifest JavaLauncher.class compress.rb -C vendor .'
end