So I finally got my test plan accepted for a 1 month trial to the Oracle Public Cloud at https://cloud.oracle.com/ .
Some initial thoughts- this Java cloud seemed more suitable for web apps, than for data science ( but I have to spend much more time on this).
I really liked the help and documentation and tutorials, Oracle has invested a lot in it to make it friendly to enterprise users.
Hopefully the Oracle R Enterprise ORE guys can talk to the Oracle Cloud department and get some common use case projects going.
In the meantime, I did a roundup on all R -Java projects.
- rJava by Simon Urbanek-http://cran.r-project.org/web/packages/rJava/index.html
Low-level interface to Java VM very much like .C/.Call and friends. Allows creation of objects, calling methods and accessing fields.
JRI is a Java/R Interface, which allows to run R inside Java applications as a single thread. Basically it loads R dynamic library into Java and provides a Java API to R functionality. It supports both simple calls to R functions and a full running REPL.
In a sense JRI is the inverse of rJava and both can be combined (i.e. you can run R code inside JRI that calls back to the JVM via rJava). The JGR project makes the full use of both JRI and rJava to provide a full Java GUI for R.
Important: JRI is now part of rJava, so if you simply want to use JRI, install rJava binary and your’e all set! There will be no further stand-alone JRI releases, JRI is now released only as a part of rJava
- RJava eclipse Plugin -http://www.studytrails.com/RJava-Eclipse-Plugin/
- Rengin by Alexander Bertram-http://code.google.com/p/renjin/
Renjin is a new JVM-based interpreter for the R language. It is intended to be 100% compatible with the original interpreter, to run on the Google AppEngine platform, and generally to open new opportunities for embedding libraries and programs written in R.
- Rsession http://code.google.com/p/rsession/ R sessions wrapping for Java
Rsession provides an easy to use java class giving access to remote or local R session. The back-end engine is Rserve 0.6, locally spawned automatically if necessary.
Rsession differs from Rserve as it is a higher level API, and it includes server side startup of Rserve. Therefore, it is easier to use in some point of vue, as it provides a multi session R engine (including for Windows, thanks to an ugly turn-around).
- RCaller -http://code.google.com/p/rcaller/
A library for calling R from Java. Also see http://stdioe.blogspot.in/search/label/rcaller
RCaller 2.0 uses the package Runiversal which has two functions for converting R list objects to Java or XML. The new logic underlying the RCaller is to translate java arrays to R, send them and the commands to R interpreter and handle the results as XML documents. XML documents then parsed using Java’s standard XML DOM document API’s. Finally, user can handle the results from Java.
- RServe -http://www.rforge.net/Rserve/
Rserve is a TCP/IP server which allows other programs to use facilities of R (see www.r-project.org) from various languages without the need to initialize R or link against R library. Every connection has a separate workspace and working directory. Client-side implementations are available for popular languages such as C/C++, PHP and Java.
The following Java code illustrates the easy integration of Rserve:
RConnection c = new RConnection();
double d = c.eval("rnorm(10)").asDoubles();
|What is JGR?|
|JGR (speak ‘Jaguar’) is a universal and unified Graphical User Interface for R (it actually abbreviates Java Gui for R). JGR was introduced at the useR! meeting in 2004 and there is an introductory article in the Statistical Computing and Graphics Newsletter|
- Riposte, a fast interpreter and JIT for R. https://github.com/jtalbot/riposte#readme