config.ru

require 'nokogiri'

run lambda {Rack::Response.new('Hello').finish}

Gemfile .rb

# Critical default settings:
disable_system_gems
disable_rubygems
bundle_path ".gems/bundler_gems"

# List gems to bundle here:
gem 'appengine-rack', '0.0.11.pre'
gem 'nokogiri',     '1.5.0.beta.2'

gistfile3.txt

SEVERE: [1280595278372000] javax.servlet.ServletContext log: unable to create shared application instance
org.jruby.rack.RackInitializationException: no such file to load -- isorelax
	from file:/Users/woodie/Desktop/nokogiri_test/WEB-INF/lib/gems.jar!/bundler_gems/jruby/1.8/gems/nokogiri-1.5.0.beta.2-java/lib/nokogiri.rb:10
	from file:/Users/woodie/Desktop/nokogiri_test/WEB-INF/lib/gems.jar!/bundler_gems/jruby/1.8/gems/nokogiri-1.5.0.beta.2-java/lib/nokogiri.rb:1:in `require'
	from config.ru:1


$ ls -1 WEB-INF/lib/
appengine-rack.jar
gems.jar
isorelax.jar
jing.jar
jruby-core-1.5.1.jar
jruby-rack-1.0.1.jar
jruby-stdlib-1.5.1.jar
nekodtd.jar
nekohtml.jar
nokogiri.jar
xercesImpl.jar

nokogiri-1.5.0.beta.2-java lib nokogiri.rb

# -*- coding: utf-8 -*-
# Modify the PATH on windows so that the external DLLs will get loaded.

require 'rbconfig'
ENV['PATH'] = [File.expand_path(
  File.join(File.dirname(__FILE__), "..", "ext", "nokogiri")
), ENV['PATH']].compact.join(';') if RbConfig::CONFIG['host_os'] =~ /(mswin|mingw)/i

if defined?(RUBY_ENGINE) && RUBY_ENGINE == "jruby"
  require 'isorelax.jar'
  require 'jing.jar'
  require 'nekohtml.jar'
  require 'nekodtd.jar'
  require 'xercesImpl.jar'
  require 'nokogiri/nokogiri'
else
  require 'nokogiri/nokogiri'
end