def to_path( group_id, artifact_id, *classifier_version )
      version = classifier_version[ -1 ]
      classifier = classifier_version[ -2 ]
      
      jar = to_jar( group_id, artifact_id, version, classifier )
      ( [ Jars.home ] + $LOAD_PATH ).each do |path|
        if File.exists?( f = File.join( path, jar ) )
          return f
        end
      end
      nil
    end
def to_path( group_id, artifact_id, *classifier_version )
      version = classifier_version[ -1 ]
      classifier = classifier_version[ -2 ]
      
      jar = to_jar( group_id, artifact_id, version, classifier )
      ( [ Jars.home ] + $LOAD_PATH ).each do |path|
        if File.exists?( f = File.join( path, jar ) )
          return f
        end
      end
      nil
    end
TODO should move into jar-dependencies