R deducer error with .jcall

Question

Recently I installed latest R (3.1) and RStudio (0.98) on Mac. While starting deducer() I get the following error.

> deducer()
Error in .jcall(.deducer, , "startNoJGR") :
   java.lang.ClassNotFoundException

I get the same error whether I start deducer from terminal or RStudio. On googling I didn't find much info either and any help is much appreciated.

r> R.version
               _                           
platform       x86_64-apple-darwin10.8.0   
arch           x86_64                      
os             darwin10.8.0                
system         x86_64, darwin10.8.0        
status                                     
major          3                           
minor          1.0                         
year           2014                        
month          04                          
day            10                          
svn rev        65387                       
language       R                           
version.string R version 3.1.0 (2014-04-10)
nickname       Spring Dance

r> library("Deducer")
r> deducer()
Error in .jcall(.deducer, , "startNoJGR") : 
  RcallMethod: cannot determine object class

terminal> java -version
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)

Answer 1

On Mac one can only kick-off deducer from JGR env and all goes well. See Ian's reply at https://groups.google.com/forum/#!topic/deducer/H7rqPFE9qY8

Answer 2

I have run in to the same/similar problem. The best thing would be to launch JGR and enable the Deducer and Deducer Extras from JFG package manager as described in the Wiki link bellow for deducer.

Deducer Mac OS Installation and usage.

I created a small R script the contains the code to launch JGR (the fours lines of code)

Sys.setenv(NOAWT=1)
library(JGR)
Sys.unsetenv("NOAWT")
JGR()

and in the Package manager for JGR, checked the load and default check boxes for Deducer and Deducer Extras.