Jruby :无法打开任何[xml2，xslt，exslt]窗口

Question

我在windows vista 64位操作系统上运行。Geografikos是一个由Jeremy Witmer创建的大型硕士论文项目。它都是用JRuby编写的。我目前正在他的指导下扩展项目，但我不能运行他的程序。已经安装了以下gem：

C:\work\Code\geografikos>jruby -S gem list

*** LOCAL GEMS ***

actionmailer (2.3.3)
actionpack (2.3.3)
activerecord (2.3.3)
activerecord-jdbc-adapter (0.9.1)
activerecord-jdbcmysql-adapter (0.9.1)
activeresource (2.3.3)
activesupport (2.3.3)
gchart (1.0.0)
google-geocode (1.2.1)
hoe (2.3.3)
hpricot (0.6.161)
jdbc-mysql (5.0.4)
jruby-openssl (0.5.1)
minitest (1.4.2)
nokogiri (1.3.3)
rack (1.0.0)
rails (2.3.3)
rake (0.8.7)
rc-rest (3.0.0)
rdoc (2.4.3)
rspec (1.2.6)
rubyforge (1.0.4)
rubygems-update (1.3.5)
sources (0.0.1)

geografikos.rb需要以下gem：

%w(rubygems digest/sha1 digest/md5 active_record hpricot yaml open-uri ostruct java google_geocode gchart active_record/fixtures).each{|f| require f}

当我需要或运行geografikos.rb时，我得到了以下错误：

C:\work\Code\geografikos>jirb
irb(main):001:0> require 'geografikos'
LoadError: Could not open any of [xml2, xslt, exslt]
        from C:/jruby-1.3.1/bin/../lib/ruby/1.8/ffi/library.rb:18:in `ffi_lib'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri/ffi/libxml.rb:5
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri/ffi/libxml.rb:31:in `require'
        from C:/jruby-1.3.1/bin/../lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:521:in `new_constants_in
'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri.rb:10
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/nokogiri-1.3.3-java/lib/nokogiri.rb:31:in `require'
        from C:/jruby-1.3.1/bin/../lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:521:in `new_constants_in
'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/rc-rest-3.0.0/lib/rc_rest.rb:3
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/rc-rest-3.0.0/lib/rc_rest.rb:31:in `require'
        from C:/jruby-1.3.1/bin/../lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:521:in `new_constants_in
'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/google-geocode-1.2.1/lib/google_geocode.rb:2
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/google-geocode-1.2.1/lib/google_geocode.rb:36:in `require'
        from C:/jruby-1.3.1/bin/../lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:521:in `new_constants_in
'
        from C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:156:in `require'
        from geografikos.rb:304
        from geografikos.rb:304:in `each'
        from geografikos.rb:304
        from geografikos.rb:2:in `require'
        from (irb):2irb(main):002:0>

我感觉我需要安装xml、xml2、xslt和exslt库，但在尝试安装这些库时出现错误，如下所示：

C:\work\Code\geografikos>jruby -S gem install libxml-ruby
Building native extensions.  This could take a while...
ERROR:  Error installing libxml-ruby:
        ERROR: Failed to build gem native extension.

C:/jruby-1.3.1/bin/../bin/jruby.bat extconf.rb
C:/jruby-1.3.1/bin/../lib/ruby/1.8/mkmf.rb:7: JRuby does not support native extensions. Check wiki.jruby.org for alternatives. (No
tImplementedError)
        from C:/jruby-1.3.1/bin/../lib/ruby/1.8/mkmf.rb:14:in `require'
        from extconf.rb:14


Gem files will remain installed in C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/libxml-ruby-1.1.3 for inspection.
Results logged to C:/jruby-1.3.1/lib/ruby/gems/1.8/gems/libxml-ruby-1.1.3/ext/libxml/gem_make.out

如果您需要任何其他信息，请告诉我。我解决不了这个问题！

Answer 1

这些gem似乎是“本机”实现的；也就是说，使用低级语言实现，而不是直接用Ruby实现。JRuby不支持带有本地扩展的gem，因为它不能在JVM中运行它们。