[R] can't load rJava in R 2.8.1 on Windows XP

[Duncan Murdoch]

Dieter Menne wrote:
> Duncan Murdoch <murdoch <at> stats.uwo.ca> writes:
>
>   
>>> Slightly different for me, but failure: 
>>>
>>> jvm.dll is on path (checked successfully with "where jvm.dll")
>>>       
>>  From within R?  Remember that the PATH is process-specific.  Maybe your 
>> shell added something that put jvm.dll on its path, but you didn't start 
>> Rgui from there.
>>
>> In any case, looking at the .onLoad, it appears the easiest thing to do 
>> is to define the environment variable JAVA_HOME.  The startup code puts 
>> $JAVA_HOME/bin, $JAVA_HOME/bin/client, and $JAVA_HOME/jre/bin/client 
>> onto the end of the path, so things should work if at least one of those 
>> has your jvm.dll in it.
>>
>>     
>
> JAVA_HOME had been defined (that's how I started, after reading the c code).
>
>
> In RGui
>
>   
>> shell("where jvm.dll")
>>     
> C:\Program Files\Java\jre6\bin\client\jvm.dll
>
>   
>> shell("set JAVA_HOME")
>>     
> JAVA_HOME=C:\Program Files\Java\jre6
>   

That doesn't last beyond the shell call, as far as I know.  It starts a 
process to run the shell, sets the environment variable in that process, 
then the process dies and the setting dies with it.  If you want a 
permanent setting, you should set it in the Rgui process, via Sys.setenv().

Duncan Murdoch
>
> And yet : the dialog box as mentioned, and, after clicking Ok:
>
> Error in inDL(x, as.logical(local), as.logical(now), ...) : 
>   unable to load shared library
> 'C:/PROGRA~1/R/R-28~1.0/library/rJava/libs/rJava.dll':
>   LoadLibrary failure:  Das angegebene Modul wurde nicht gefunden.
>
>
> Error : .onLoad failed in 'loadNamespace' for 'rJava'
> Error: package/namespace load failed for 'rJava'
>   
>
> If it matters: same problem from Rterm. To be sure it is not a security 
> problem under Vista, I also run both RGui and Rterm as admin. Same.
>
> Dieter
>
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