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Gary Massing

2009-Sep-17 06:45 UTC

Load Error Using Mechanize Gem

Hi,

I''m getting a "Could not open any of [xml2, xslt, exslt]
(LoadError)" error when trying to run a simple Ruby program taken from the
EXAMPLES.rdoc file of the Mechanize gem.

The error is in this line of the Nokogiri module of libxml.rb:  ffi_lib
''xml2'', ''xslt'', ''exslt''

Not sure if there are missing gems, and if so, what to install.  Any ideas how
to fix this?

Thanks very much.

Gary M.




Program -- main.rb:
----------------------
## Google
  require ''rubygems''
  require ''mechanize''

  a = WWW::Mechanize.new { |agent|
    agent.user_agent_alias = ''Mac Safari''
  }

  a.get(''http://google.com/'') do |page|
    search_result = page.form_with(:name => ''f'') do
|search|
      search.q = ''Hello world''
    end.submit

    search_result.links.each do |link|
      puts link.text
    end
  end
----------------------


Resources I''m using:

Editor:  Netbeans IDE 6.7.1
Gems installed (among others):  mechanize-0.9.3, nokogiri-1.3.3-java
Operating System:  Windows Vista Home Premium, Service Pack 1, 64-Bit

Error message stack:

JRuby limited openssl loaded. gem install jruby-openssl for full support.
http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL
C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/1.8/ffi/library.rb:18:in `ffi_lib'':
Could not open any of [xml2, xslt, exslt] (LoadError)
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri/ffi/libxml.rb:5
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri/ffi/libxml.rb:31:in
`require''
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require''
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri.rb:10
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri.rb:31:in
`require''
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require''
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/www/mechanize.rb:9
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/www/mechanize.rb:31:in
`require''
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require''
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/mechanize.rb:7
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/mechanize.rb:36:in
`require''
        from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in
`require''
        from
C:\Users\Gary\Documents\NetBeansProjects\HTMLTextReplacement\lib\main.rb:5


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Abhijat Mahajan

2009-Sep-17 10:40 UTC

head link

Re: Load Error Using Mechanize Gem

Hi
I am assuming things here because you are on Jruby and windows

But you do require those libraries. Nokogiri in particular needs the
latest version of LibXml2 and you can run
nokogiri -v on your terminal to see if it has been built with the
latest version of libxml and the libxml2.dll is in the corrent load
path.


However I found this on the tenderlove wiki github its a known issue
and someone has sugested a workaround for windows:

http://github.com/tenderlove/nokogiri/issues/#issue/90

quote
"I solved the problem and record them here:
http://maodan520.spaces.live.com/blog/cns!E0C8D36B1650926A!237.entry

Make sure do not use libxml2 or libxslt, you should use libexslt. Good
luck.
"

I hope that helps


On Sep 17, 4:45 pm, "Gary Massing"
<gmass...-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
wrote:> Hi,
>
> I''m getting a "Could not open any of [xml2, xslt, exslt]
(LoadError)" error when trying to run a simple Ruby program taken from the
EXAMPLES.rdoc file of the Mechanize gem.  
>
> The error is in this line of the Nokogiri module of libxml.rb:  ffi_lib
''xml2'', ''xslt'', ''exslt''
>
> Not sure if there are missing gems, and if so, what to install.  Any ideas
how to fix this?
>
> Thanks very much.
>
> Gary M.
>
> Program -- main.rb:
> ----------------------
> ## Google
>   require ''rubygems''
>   require ''mechanize''
>
>   a = WWW::Mechanize.new { |agent|
>     agent.user_agent_alias = ''Mac Safari''
>   }
>
>   a.get(''http://google.com/'') do |page|
>     search_result = page.form_with(:name => ''f'') do
|search|
>       search.q = ''Hello world''
>     end.submit
>
>     search_result.links.each do |link|
>       puts link.text
>     end
>   end
> ----------------------
>
> Resources I''m using:
>
> Editor:  Netbeans IDE 6.7.1
> Gems installed (among others):  mechanize-0.9.3, nokogiri-1.3.3-java
> Operating System:  Windows Vista Home Premium, Service Pack 1, 64-Bit
>
> Error message stack:
>
> JRuby limited openssl loaded. gem install jruby-openssl for full
support.http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL
> C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/1.8/ffi/library.rb:18:in `ffi_lib'':
Could not open any of [xml2, xslt, exslt] (LoadError)
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri/ffi/libxml.rb:5
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri/ffi/libxml.rb:31:in
`require''
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require''
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri.rb:10
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri.rb:31:in
`require''
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require''
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/www/mechanize.rb:9
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/www/mechanize.rb:31:in
`require''
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require''
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/mechanize.rb:7
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/gems/1.8/gems/mechanize-0.9.3/lib/mechanize.rb:36:in
`require''
>         from C:/Program Files (x86)/NetBeans
6.7.1/ruby2/jruby-1.2.0/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in
`require''
>         from
C:\Users\Gary\Documents\NetBeansProjects\HTMLTextReplacement\lib\main.rb:5

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