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rJava provides a low-level bridge between R and Java (via JNI). It allows to create objects, call methods and access fields of Java objects from R. rJava release versions can be obtained from CRAN - usually install. packages("rJava") in R will do the trick.
rJava is a JNI (Java Native Interface)-based, R-to-Java interface with which Java objects may be created and Java methods called and Java fields accessed from R. In this tutorial, we shall get started with using the rJava R package to use Java from R. This tutorial has the following sections: Setting the Environment.
Wouldn't
apt-get install r-cran-rjava
have been easier? You could have asked me at useR! :)
Turns out my problem was an issue with my JAVA_HOME environment variable. Yes, shocking I know. My initial setting for PATH and JAVA_HOME looked like this:
export JAVA_HOME=/usr/lib/jvm/java-6-sun
export PATH=$PATH:$JAVA_HOME/bin
And I added /jre so it now looks like this:
export JAVA_HOME=/usr/lib/jvm/java-6-sun/jre
export PATH=$PATH:$JAVA_HOME/bin
Everything in Java seemed to work fine without the /jre but rJava would not. Odd.
That is how I make it work :
sudo apt-get install default-jre
sudo apt-get install default-jdk
sudo R CMD javareconf
install.packages("rJava")
Thanks - your suggestion about $JAVA_HOME lead me to a similar solution:
unset JAVA_HOME
before invoking R.
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