Problems loading rJava Package on Win7

Question

I have installed the latest versions of R (2.15.2) and Java (7.11), and through RStudio (0.97.310) I am trying to load the rJava package. It seemed to install properly, but when I call library(rJava) I get the following error:

 Error : .onLoad failed in loadNamespace() for 'rJava', details:
 call: stop("No CurrentVersion entry in '", key, "'! 
 Try re-installing Java and make sure R and Java have matching architectures.")
 error: object 'key' not found
 Error: package/namespace load failed for ‘rJava’

The documentation for rJava makes reference to Java 1.5+, so I am wondering if I need to install an ancient version of Java to resolve this problem. Any help would be much appreciated!

Arduous

Check out if you need for 64bit or 32. Your java type and R type need to match. See: java.com/en/download/faq/java_win64bit.xml – Triturate

Which version of java are you sung system("java -version")? – Calcareous

This is almost a duplicate to the question I asked: https://mcmap.net/q/754036/-rjava-warning-meaning but mine was more for compiling the package. In any event the issue is the same. – Triturate

Answer 1

Ok, I figured it out. Guess I should have read the release notes on the rJava development website. I had installed Java, but not the JDK. Once I installed that, everything worked fine.

Arduous

Answer 2

I had this problem and solved it by downloading and installing Java 64-bit (which you should probably choose if you have a modern computer) from the Java download site.

Hump