rJava works with 32-bit but not 64

On Feb 4, 2013, at 6:33 AM, Spencer Graves wrote:

On 2/3/2013 11:21 PM, Pascal Oettli wrote:

Hello,

Do you have a 64-bit version of Java?

rJava says to you:
call: stop("No CurrentVersion entry in '", key, "'! Try

re-installing Java and make sure R and Java have matching
architectures.")

     I think I probably have a 32-bit version and not a 64-bit,

because it works with 32-bit R but not 64-bit R.

     Is it feasible to have both installed in a way that allows the

each version of R to select its own version of Java?

Yes, that is the default. 32-bit R will only see 32-bit Java and vice
versa, because Windows separates 32-bit and 64-bit registries.

 A comment on stackoverflow suggests that may not be easy

(http://stackoverflow.com/questions/5272216/is-it-possible-to-install-both-32bit-and-64bit-java-on-windows-7). 

Ehm, it says "Yes, it is absolutely no problem. " -- which part of it
suggests it's not easy? SO is a good source of rumors, seldom facts --
but in this case it's not too far from the truth.

Cheers,
Simon

     Thanks,
     Spencer

Regards,
Pascal


Le 04/02/2013 14:27, Spencer Graves a ?crit :

Hello:


      rJava works for me under 32-bit but under not 64-bit R; see below.


      Suggestions?
      Thanks,
      Spencer

library(rJava)

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'

sessionInfo()

R version 2.15.2 (2012-10-26)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods base

##########################

library(rJava)
sessionInfo()

R version 2.15.2 (2012-10-26)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods base

other attached packages:
[1] rJava_0.9-3

-- 
Spencer Graves, PE, PhD
President and Chief Technology Officer
Structure Inspection and Monitoring, Inc.
751 Emerson Ct.
San Jos?, CA 95126
ph:  408-655-4567
web:  www.structuremonitoring.com