config.ru

require 'appengine-rack'
AppEngine::Rack.configure_app(
    :application => "gae151pre2test",
    :precompilation_enabled => true,
    :version => "1")

class HelloApp
  def call(env)
    ::Rack::Response.new("Hello").finish
  end
end

case 1 # 1,2,3
when 1
    s = File.lstat("/Users") ## <<<<<<<<<<<<<<<<<<<<<<
    p ["A: lstat=", s]

    class DeferredDispatcher2
      def initialize args
        @args = args
        p ["DeferredDispatcher2#initialize: @args", @args]
        @args
      end

      def call env
        p ["DeferredDispatcher2#call: @runtime", @runtime]
        p ["DeferredDispatcher2#call: @rack_app", @rack_app]
        if @runtime.nil?
          @runtime = true
          # 1: redirect with runtime and jruby-rack loaded
          redirect_or_error(env)
        elsif @rack_app.nil?
          p "[@rack_app.nil?==true]"
          s = nil
          begin
            s = File.lstat("/Users") ## <<<<<<<<<<<<<<<<<<<<<<
          rescue => e
            p "<<<<ERROR>>>> e=#{e.inspect}"
            raise e
          end
          p ["B: lstat=", s]

          require @args[:require] if @args[:require]
          @rack_app = Object.module_eval(@args[:dispatch]).new
          # 2: redirect with framework required & dispatched
          redirect_or_error(env)
        else
          # 3: process all other requests
          @rack_app.call(env)
        end
      end

      def redirect_or_error(env)
        if env['REQUEST_METHOD'].eql?('GET')
          redir_url = env['REQUEST_URI'] +
              (env['QUERY_STRING'].eql?('') ? '?' : '&') + Time.now.to_i.to_s
          res = ::Rack::Response.new('*', 302)
          res['Location'] = redir_url
          res.finish
        else
          ::Rack::Response.new('Service Unavailable', 503).finish
        end
      end
    end
    deferred_dispatcher = DeferredDispatcher2.new(
      :require => nil,
      :dispatch => 'HelloApp')
    run deferred_dispatcher
when 2
  deferred_dispatcher = AppEngine::Rack::DeferredDispatcher.new(
    :require => "time", # dummy!!
    :dispatch => 'HelloApp')
  run deferred_dispatcher
when 3
  run HelloApp.new
  #lambda { ::Rack::Response.new("Hello").finish }
end

Gemfile

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

# List gems to bundle here:

gem 'appengine-rack', '0.0.10.pre'
gem 'jruby-openssl',  '0.7'
gem 'jruby-jars',     '1.5.1.pre2'

gistfile3.txt

tkrmb:~/demo/gae151pre2test% ls -l .gems/bundler_gems/jruby/1.8/cache
total 21912
-rw-r--r--   1 takeru  takeru    15360  6  5 12:51 appengine-rack-0.0.10.pre.gem
-rw-r--r--   1 takeru  takeru    15360  6  5 12:50 appengine-rack-0.0.9.gem
-rw-r--r--   1 takeru  takeru  9982976  6  5 12:50 jruby-jars-1.4.1.gem
-rw-r--r--   1 takeru  takeru  9984000  6  5 12:51 jruby-jars-1.5.1.pre2.gem
-rw-r--r--   1 takeru  takeru  2174976  6  5 12:51 jruby-openssl-0.7.gem
-rw-r--r--   1 takeru  takeru   148992  6  5 12:50 jruby-rack-1.0.1.gem
-rw-r--r--   1 takeru  takeru   104448  6  5 12:50 rack-1.1.0.gem

tkrmb:~/demo/gae151pre2testls -l .gems/bundler_gems/jruby/1.8/gems                   
total 0
drwxr-xr-x    5 takeru  takeru  170  6  5 12:51 appengine-rack-0.0.10.pre
drwxr-xr-x    6 takeru  takeru  204  6  5 12:51 jruby-jars-1.5.1.pre2
drwxr-xr-x    9 takeru  takeru  306  6  5 12:51 jruby-openssl-0.7
drwxr-xr-x    6 takeru  takeru  204  6  5 12:50 jruby-rack-1.0.1
drwxr-xr-x   13 takeru  takeru  442  6  5 12:50 rack-1.1.0

tkrmb:~/demo/gae151pre2test% ls -l WEB-INF/lib 
total 24944
-rw-r--r--   1 takeru  takeru  9993366  6  5 12:50 appengine-api-1.0-sdk-1.3.4.jar
-rw-r--r--   1 takeru  takeru  1216274  6  5 12:50 appengine-api-labs-1.3.4.jar
-rw-r--r--   1 takeru  takeru     4294  6  5 13:09 appengine-rack.jar
-rw-r--r--   1 takeru  takeru   225425  6  5 13:09 bcmail-jdk15-144.jar
-rw-r--r--   1 takeru  takeru  1643601  6  5 13:09 bcprov-jdk15-144.jar
-rw-------   1 takeru  takeru   395421  6  5 13:09 gems.jar
-rw-r--r--   1 takeru  takeru   417605  6  5 13:09 jopenssl.jar
-rw-r--r--   1 takeru  takeru  8176368  6  5 13:09 jruby-core-1.5.1.pre2.jar
-rw-r--r--   1 takeru  takeru   157793  6  5 13:09 jruby-rack-1.0.1.jar
-rw-r--r--   1 takeru  takeru  3291087  6  5 13:09 jruby-stdlib-1.5.1.pre2.jar

gistfile4.txt

% LANG=C dev_appserver.rb .
=> Booting DevAppServer
=> Press Ctrl-C to shutdown server
Warning: The Mac OS -XstartOnFirstThread: is currently unsupported
Jun 5, 2010 5:32:04 AM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Jun 5, 2010 5:32:04 AM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed /Users/takeru/demo/gae151pre2test/WEB-INF/appengine-web.xml
Jun 5, 2010 5:32:04 AM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed /Users/takeru/demo/gae151pre2test/WEB-INF/web.xml
Jun 5, 2010 5:32:04 AM com.google.apphosting.utils.jetty.JettyLogger info
INFO: jetty-6.1.x
["A: lstat=", #<File::Stat dev=0xino=0, mode=040644, nlink=uid=-1, gid=rdev=0xsize=306, blksize=4096, blocks=atime=Sun Apr 18 08:21:50 UTC 2010, mtime=Sun Apr 18 08:21:50 UTC 2010, ctime=Mon May 31 16:01:47 UTC 2010>]
["DeferredDispatcher2#initialize: @args", {:require=>nil, :dispatch=>"HelloApp"}]
Jun 5, 2010 5:32:15 AM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Started SelectChannelConnector@127.0.0.1:8080
Jun 5, 2010 5:32:15 AM com.google.appengine.tools.development.DevAppServerImpl start
INFO: The server is running at http://localhost:8080/
["DeferredDispatcher2#call: @runtime", nil]
["DeferredDispatcher2#call: @rack_app", nil]
["DeferredDispatcher2#call: @runtime", true]
["DeferredDispatcher2#call: @rack_app", nil]
"[@rack_app.nil?==true]"
"<<<<ERROR>>>> e=#<Errno::ENOENT: No such file or directory - /Users>"
Jun 5, 2010 5:32:22 AM com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: [1275715942889000] javax.servlet.ServletContext log: Application Error
config.ru:36:in `call': No such file or directory - /Users (Errno::ENOENT)
        from file:/Users/takeru/demo/gae151pre2test/WEB-INF/lib/jruby-rack-1.0.1.jar!/rack/handler/servlet.rb:19:in `call'
        from :1
        ...internal jruby stack elided...
        from DeferredDispatcher2.call(file:/Users/takeru/demo/gae151pre2test/WEB-INF/lib/jruby-rack-1.0.1.jar!/rack/handler/servlet.rb:19)
        from Rack::Handler::Servlet.call(:1)
        from (unknown).(unknown)(:1)