Renjin is a JVM-based interpreter for the R language. For Java developers of scientific application, I think it is a must (but still I need to test it). It can be used in various ways and offers itself a simple interface to be used. The fraction of packages ported into it is here.
For an introduction you can watch this webinar. But obviously you can have more by browsing Rnjin website.
For an introduction you can watch this webinar. But obviously you can have more by browsing Rnjin website.
Among others, gvSIG uses Renjin for making calculations. The source code is available on GIThub.
Click on the Figure to go to Renjin website.