RubyGems.org

A collection of core java utilities with ruby adapters for JRuby. * A concurrent (thread safety) testing facility for java JUnit, ruby Test::Unit, or other test harnesses. * A concurrent performance testing facility for java/JRuby with simple test wiring in ruby. * A Heterogeneous Type-safe Map implementation in java. * A set of core java utility classes (resizable buffers, a stopwatch, \ SI unit formatting, fast random number generator), in support of the above and of general utility.