Rjb is Ruby-Java bridge using Java Native Interface. How to install you need to install Java2 sdk, and setup JAVA_HOME enviromental varible except for OS X. I assume that OS X's JAVA_HOME is fixed as '/System/Library/Frameworks/JavaVM.framework'. then, ruby setup.rb config ruby setup.rb setup (in Unix) sudo ruby setup.rb install or (in win32) ruby setup.rb install How to test in Win32 cd test ruby test.rb in Unix see test/readme.unix you must set LD_LIBRARY_PATH environmental variable to run rjb. artonx@yahoo.co.jp