我已尝试关注jruby调试器的各种在线参考，但它无效。
我尝试过以下操作：首先更改为root（不能像普通用户一样）然后：
jruby -S gem install ruby-debug-base
jruby -S gem install ruby-debug-base
但是以下命令失败：
jruby --debug -S rdebug ./classifier-wf.rb
Gem::LoadError: Could not find columnize (>= 0.1) amongst [jdbc-mysql-5.1.24, rake-10.0.3, ruby-debug-0.10.4, ruby-debug-base-0.10.4-java]
to_specs at /opt/jruby-1.7.3/lib/ruby/shared/rubygems/dependency.rb:247
activate_dependencies at /opt/jruby-1.7.3/lib/ruby/shared/rubygems/specification.rb:777
each at org/jruby/RubyArray.java:1613
activate_dependencies at /opt/jruby-1.7.3/lib/ruby/shared/rubygems/specification.rb:766
activate at /opt/jruby-1.7.3/lib/ruby/shared/rubygems/specification.rb:750
gem at /opt/jruby-1.7.3/lib/ruby/shared/rubygems.rb:1232
(root) at /opt/jruby-1.7.3/bin/rdebug:22
我正在运行jruby 1.7.3。感谢。