gistfile1

~/projects/solrium [master] $ rake build
(in /Users/jan/projects/solrium)
  Successfully built RubyGem
  Name: solrium
  Version: 0.1.0
  File: solrium-0.1.0.gem
~/projects/solrium [master] $ rvm use jruby
Using /Users/jan/.rvm/gems/jruby-1.5.6
~/projects/solrium [master] $ gem install pkg/solrium-0.1.0.gem 
Successfully installed solrium-0.1.0
1 gem installed
~/projects/solrium [master] $ irb
>> require 'rubygems'
=> true
>> gem 'solrium'
=> true
>> require 'solr'            
May 11, 2011 5:36:05 PM sun.reflect.NativeMethodAccessorImpl invoke0
INFO: Logging to org.slf4j.impl.JDK14LoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
=> true
>>  Solrium::Solr.new('/foo')
RuntimeError: solr_home /foo not found  

I believe this should be:

...
jruby-1.6.0 :001 > require 'rubygems'
 => true 
jruby-1.6.0 :002 > gem 'solrium'
 => true
...

ah right. i have require 'rubygems' in my .irbrc because you almost always need it.

makes sense. :-P