[Mongrel] error when installing on jruby (fastthread dependency)

[Stephen Bannasch]

I was able to get the mongrel gem installed in JRuby by first 
compiling it with MRI but specifying java:

   $ svn co http://mongrel.rubyforge.org/svn/trunk mongrel
   $ cd mongrel
   $ rake package java

then in JRuby

   $ cd mongrel/pkg
   $ gem install mongrel-1.1.2-java.gem
   Successfully installed mongrel-1.1.2
   1 gem installed
   Installing ri documentation for mongrel-1.1.2...
   Installing RDoc documentation for mongrel-1.1.2...