Rake “no such file to load — java” even when `whic

I am a Ruby noob (rube?) and am having trouble configuring my environment to get rake to build something with a Java dependency.

I run

$ PATH=/tmp/jruby-dodge:"$PATH" rake

and get

/opt/local/bin/ruby -S rspec spec/contextual_spec.rb
/opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- java (LoadError)
        from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from /Users/msamuel/work/igrigorik/contextual/lib/contextual/contextual.rb:1
        from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from /Users/msamuel/work/igrigorik/contextual/lib/contextual.rb:2
        from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from /opt/local/lib/ruby/vendor_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from /Users/msamuel/work/igrigorik/contextual/spec/contextual_spec.rb:1
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `load'
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `load_spec_files'
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `map'
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/configuration.rb:698:in `load_spec_files'
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/command_line.rb:22:in `run'
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:80:in `run_in_process'
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:69:in `run'
        from /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.8.0/lib/rspec/core/runner.rb:10:in `autorun'
        from /opt/local/bin/rspec:19
rake aborted!
/opt/local/bin/ruby -S rspec spec/contextual_spec.rb failed

Tasks: TOP => default => spec
(See full trace by running task with --trace)

The PATH=/tmp/jruby-dodge:... makes sure that which ruby actually resolves to a symlink to /opt/local/bin/jruby.

Is "no such file to load -- java" related to jruby at all? java -version emits java version "1.6.0_29" so I don't think there is a failure to start up a JVM.

When using rake to build something with Java dependencies for use under jruby, does it matter whether rake is running under jruby or ruby? If so, how do I specify that?

It looks like rvm lets me juggle multiple rubies.

Installing RVM explains how to install it.