Multipart upload thru J2Me fail

Hi,
I am developing a j2me application to upload photos to a rail web
server.

I use multipart upload. My code work fine with PHP web server(when i
upload to php page).

But when i upload it to my real Rail Server, it show errors. I guess
it's because of i don't have Content-length header in my POST request.

I use the following j2me code for my upload:
http://wiki.forum.nokia.com/index.php/HTTP_Post_multipart_file_upload_in_Java_ME

Please help.

Here's the error code it produced from WebRick
/!\ FAILSAFE /!\ Tue Dec 14 02:11:10 +0700 2010
  Status: 500 Internal Server Error
  negative length -29 given
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/rewindable_input.rb:15:in
`read'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/rewindable_input.rb:15:in
`__send__'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/rewindable_input.rb:15:in
`method_missing'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/utils.rb:344:in
`parse_multipart'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/utils.rb:317:in
`loop'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/utils.rb:317:in
`parse_multipart'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/request.rb:124:in
`POST'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/methodoverride.rb:15:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/params_parser.rb:15:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/rewindable_input.rb:25:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/session/cookie_store.rb:93:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/reloader.rb:9:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/failsafe.rb:11:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/lock.rb:11:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/lock.rb:11:in
`synchronize'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/lock.rb:11:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/dispatcher.rb:106:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/rack/static.rb:31:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/urlmap.rb:46:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/urlmap.rb:40:in
`each'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/urlmap.rb:40:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/rails/rack/log_tailer.rb:17:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/content_length.rb:13:in
`call'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/webrick.rb:46:in
`service'
    E:/Ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    E:/Ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:162:in `start'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:95:in `start'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:92:in `each'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:92:in `start'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:23:in `start'
    E:/Ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'
    E:/Ruby/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/webrick.rb:13:in
`run'
    E:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/commands/server.rb:111
    E:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
    E:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
    script/server:3