Java-R integration?

Question

I have a Java app which needs to perform partial least squares regression. It would appear there are no Java implementations of PLSR out there. Weka might have had something

Answer 1

I have successfully used two alternatives in the past.

JRI

• Pros: probably better performance.
• Cons: you have to configure some environment variables and libraries, different in Win/UNIX.

RServe

• Pros: easy to setup, you don't need to initialize R or link against any R library, can run in a different machine.
• Cons: based on TCP/IP (a server is running), no callbacks from R.

Other alternatives I have never used : RCaller

Answer 2

I had similar need a while back and tested a few of the interfaces to R. The one I found to be the best for my needs (windows, c#) was Rserve which I believe is written in Java. My only gripe with it is that it wasn't 64-bit. I used a simple client written in c# and it worked very well. I'm sure the Java client is a lot better.