What is "renjin"

Renjin is an implementation of the R programming language atop the Java Virtual Machine. It is free software released under the GPL. Renjin is tightly integrated with Java to allow the embedding of the interpreter into any Java application with full two-way access between the Java and R code.

Renjin's development is primarily supported by BeDataDriven, but ultimately made possibly by several current and past contributors including Mehmet Hakan Satman, Hannes Mühleisen, and Ruslan Shevchenko.