Renjin is a JVM-based interpreter for the The R Project for Statistical Computing.

The primary goals of the project are to provide a modern interpreter that serves as a drop-in replacement for GNU R, but is easier to integrate with other systems, offers better performance, and is more extensible.

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Renjin is available under the GPLv2 (or higher) license, see LICENSE for the full text of the license. Renjin also includes code from R which is redistributed here. R uses many different licenses so check the file sources to see which license applies.
Database Architectures

Mühleisen, H.F. (2016). Renjin.