Renjin is a new interpeter for the R language that runs on the JVM. It's principle goal is to facilitate the use of R-language programs and libraries in a wider variety of environments, such as Google AppEngine, on which this example is running.
Renjin is meant to be 100% compatible with R 2.14.2, but not all primitive functions are implemented. (help wanted!). If you see a result that is inconsistent with the original interpreter or just plain wrong, please report it.