jenkins_embedding_rack

sinatra_plugin.rb

root@ubuntu-precise:~/work/sinatra_plugin# cat models/sinatra_plugin.rb 
require 'rubygems'
require 'sinatra/base'
require 'jenkins/rack'

class SomeSinatraApp < Sinatra::Base
  get '/hi' do
    'Help'
  end
end

class SinatraTestPlugin < Jenkins::Model::RootAction
  display_name 'Test Root Action'
  icon 'gear.png'
  url_path 'root_action'

  include Jenkins::RackSupport
  def call(env)
    SomeSinatraApp.new.call(env)
  end
end

stacktrace

Status Code: 500
Exception:
Stacktrace:

com.google.common.collect.ComputationException: java.lang.NoSuchMethodError: org.kohsuke.stapler.jelly.jruby.JRubyClassInfo.findResource(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/net/URL;
	at com.google.common.collect.ComputingConcurrentHashMap$ComputingMapAdapter.get(ComputingConcurrentHashMap.java:397)
	at org.kohsuke.stapler.CachingScriptLoader.findScript(CachingScriptLoader.java:61)
	at org.kohsuke.stapler.jelly.jruby.JRubyFacet$1.dispatch(JRubyFacet.java:104)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:563)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:648)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:502)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:648)
	at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:384)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:563)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:648)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:477)
	at org.kohsuke.stapler.Stapler.service(Stapler.java:159)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
	at winstone.ServletConfiguration.execute(ServletConfiguration.java:249)
	at winstone.RequestDispatcher.forward(RequestDispatcher.java:335)
	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378)
	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)
	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
	at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)