R help - May 2009 - Problem loading rJava

I am running R on Windows XP
I first tried to install rJava and got this message

utils:::menuInstallLocal()
package 'rJava' successfully unpacked and MD5 sums checked
updating HTML package descriptions

then i tried this

require(rJava)
Loading required package: rJava
Error in if (!nchar(javahome)) stop("JAVA_HOME is not set and could not be 
determined from the registry") : 
  argument is of length zero
Error : .onLoad failed in 'loadNamespace' for 'rJava'

Not yet realizing I didn't have Java installed, I instead tried to 
reinstall the package rJava and got this: 

utils:::menuInstallLocal()
package 'rJava' successfully unpacked and MD5 sums checked
Warning: cannot remove prior installation of package 'rJava'
updating HTML package descriptions

I finally realized I didn't have Java installed on my computer, so I 
downloaded Java and tested that it works.

I then attempted to reinstall rJava and load the package, but got this;

utils:::menuInstallLocal()
package 'rJava' successfully unpacked and MD5 sums checked
Warning: cannot remove prior installation of package 'rJava'
updating HTML package descriptions

require(rJava)
Loading required package: rJava
Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, 
logical.return = TRUE,  :
  there is no package called 'rJava'


What do I need to do?   rJava is not in the library even though the 
warning message indicates there is a prior installation of rJava

Thanks for your help

JK




	[[alternative HTML version deleted]]

<Josef.Kardos <at> phila.gov> writes:
> 
> I finally realized I didn't have Java installed on my computer, so I 
> downloaded Java and tested that it works.
> 
> I then attempted to reinstall rJava and load the package, but got this;
> 
> utils:::menuInstallLocal()
> package 'rJava' successfully unpacked and MD5 sums checked
> Warning: cannot remove prior installation of package 'rJava'
> updating HTML package descriptions
This sound like you did not leave RGui when installing Java. Try again
after a restart.

Dieter