title: jruby rubygems update breaks jgem
body: <p>Has anyone seen this: ??  No <code>jgem</code> command works at all??  Though <code>jruby -S gem list</code> does work.  I'm using jruby 1.3.1 and Sun Java6 jre</p>
  
  <pre><code>root@test:/usr/local: jgem --version  
  1.3.3  
  
  root@test:/usr/local: jgem update --system  
  JRuby limited openssl loaded. gem install jruby-openssl for full support.
  http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL
  Updating RubyGems
  Updating rubygems-update
  Successfully installed rubygems-update-1.3.6
  /usr/local/jruby/lib/ruby/site_ruby/1.8/rubygems/commands/update_command.rb:103:Warning: Gem::SourceIndex#search support for String patterns is deprecated
  Updating RubyGems to 1.3.6
  Installing RubyGems 1.3.6
  RubyGems 1.3.6 installed  
  
  root@test:/usr/local: jgem list  
  /usr/local/jruby/bin/jgem: line 8: require: command not found
  /usr/local/jruby/bin/jgem: line 9: require: command not found
  /usr/local/jruby/bin/jgem: line 10: require: command not found
  /usr/local/jruby/bin/jgem: line 12: required_version: command not found
  /usr/local/jruby/bin/jgem: line 14: unless: command not found
  /usr/local/jruby/bin/jgem: line 15: abort: command not found
  /usr/local/jruby/bin/jgem: line 16: end: command not found
  /usr/local/jruby/bin/jgem: line 18: args: command not found
  /usr/local/jruby/bin/jgem: line 20: begin: command not found
  /usr/local/jruby/bin/jgem: line 21: Gem::GemRunner.new.run: command not found
  /usr/local/jruby/bin/jgem: line 22: rescue: command not found
  /usr/local/jruby/bin/jgem: line 23: exit: e.exit_code: numeric argument required
  </code></pre>