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

[Duncan Murdoch]

On 1/23/2009 9:44 AM, drflxms wrote:
> Dear Mr. Murdoch, Dear Mr. Ripley, Dear Mr. Wang,
> 
> thank you very much for your quick and efficient help! It is exactly as
> Duncan explained it: Including jvm.dll in PATH solved the problem
> immediately. Everything works fine now.
> 
> The only thing is, that I do not understand why I had to do this
> manualy, as I installed Java Runtime Environment a long time ago,
> updated frequently and never encountered any difficulties in using Java
> software.

If you look at rJava:::.onLoad now that you can load the package, you'll 
see that it goes through a number of tests to try to find the right 
path.  Those work on my system (and presumably on Simon Urbanek's, the 
rJava maintainer), but not on yours.  It might be helpful to him if you 
could find some small change to his search that would work on systems 
like yours, even without adding the jvm.dll path to the general PATH. 
(I don't have it in mine.)

Duncan Murdoch


> 
> Anyway, I am happy now :-)
> Thanx again for your great support!
> Greetings from Munich, Germany,
> 
> Felix
> 
> Duncan Murdoch schrieb:
>> On 1/23/2009 7:38 AM, drflxms wrote:
>>> Dear community,
>>>
>>> unfortunately I did not manage load the rJava package receiving the
>>> following
>>> error-message:
>>>
>>>
>>>> library("rJava")
>>> Error in inDL(x, as.logical(local), as.logical(now), ...) : kann
>>> shared library 'C:/Programme/R/2.8.1/library/rJava/libs/rJava.dll' nicht
>>> laden:
>>> LoadLibrary failure:  Das angegebene Modul wurde nicht gefunden.
>>>
>>> Error : .onLoad in 'loadNamespace' für 'rJava' fehlgeschlagen
>>> Fehler: Laden von Paket/Namensraum für 'rJava' fehlgeschlagen
>>>
>>>
>>> Translation: can't load library ... rJava.dll
>>> LoadLibrary failure: the module was not found
>>
>> That message comes from Windows, not R, and it's misleading.  It does
>> not say that rJava.dll was not found, it says that a DLL needed by it
>> is not found.  It would be helpful if it told you which one.  You
>> should complain to Microsoft about it.  If rJava.dll had been missing,
>> the English message would have been
>>
>>   shared library 'rJava' not found
>>
>> The pedump utility (in the Rtools set, see
>> www.murdoch-sutherland.com/Rtools) can tell you what the dependencies
>> are:
>>
>> pedump -i rJava.dll
>>
>> shows that it imports things from these dlls:
>>
>>  R.dll
>>  KERNEL32.dll
>>  msvcrt.dll
>>  jvm.dll
>>
>> The first 3 are routine; without those R wouldn't work. (Without
>> KERNEL32.dll, nothing in Windows would work.)  So as Brian said, it's
>> likely jvm.dll that it can't find, or possibly a DLL that it depends on.
>> Did you install Java first, as rJava requires?
>>
>> Duncan Murdoch
>>
>>>
>>> Reinstalling the package did not help, installing the latest
>>> developement
>>> version didn't help as well.
>>>
>>> The shared library rJava.dll is in place (exactly where R is looking
>>> for it)!
>>>
>>> Are there any ideas, what's wrong.
>>> I'd appreciate any kind of help very much, as I need rJava urgently
>>> to use RWeka and iPlots.
>>>
>>> Best regards,
>>> Felix
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>