Tag Archives: rJava

How to load the {rJava} package after the error “JAVA_HOME cannot be determined from the Registry”

In case you tried loading a package that depends on the {rJava} package (by Simon Urbanek), you might came across the following error:

Loading required package: rJava
Error : .onLoad failed in loadNamespace() for ‘rJava’, details:
call: fun(libname, pkgname)
error: JAVA_HOME cannot be determined from the Registry

The error tells us that there is no entry in the Registry that tells R where Java is located. It is most likely that Java was not installed (or that the registry is corrupt).

This error is often resolved by installing a Java version (i.e. 64-bit Java or 32-bit Java) that fits to the type of R version that you are using (i.e. 64-bit R or 32-bit R). This problem can easily effect Windows 7 users, since they might have installed a version of Java that is different than the version of R they are using.

Note that it is necessary to ‘manually download and install’ the 64 bit version of JAVA. By default, the download page gives a 32 bit version .

You can pick the exact version of Java you wish to install from this link. If you might (for some reason) work on both versions of R, you can install both version of Java (Installing the “Java Runtime Environment” is probably good enough for your needs).
(Source: Uwe Ligges)

Other possible solutions is trying to re-install rJava.

If that doesn’t work, you could also manually set the directory of your Java location by setting it before loading the library:

Sys.setenv(JAVA_HOME='C:\\Program Files\\Java\\jre7') # for 64-bit version
Sys.setenv(JAVA_HOME='C:\\Program Files (x86)\\Java\\jre7') # for 32-bit version

(Source: “nograpes” from Stackoverflow, which also describes the find.java in the rJava:::.onLoad function)

R GUI now offers interactive graphics – Deducer 0.4-2 connects with iplots

Earlier today, Ian Fwllows has announced the release of Deducer 0.4-2 and DeducerExtras 1.2 to CRAN (I copy his announcement here):

Deducer 0.4-2 contains a few bug fixes, and an interface to the iplots package. With the new iplots interface it is now possible to do interactive plots with Deducer. An introductory example screen cast (by Ian) is available on the tube:

DeducerExtras 1.2 contains a few new dialogs including ‘load data from package’, and ‘t-test power’.

Additionally, a new Windows R/JGR/Deducer installer is available which installs R-2.12.0, JGR with it’s launcher, Deducer, DeducerExtras, and DeducerPlugInScaling. It is available on the Deducer website: