Problem with iplots library which prevents JGR to start on macos

I want to install (and run) JGR on my macos to develop R scripts. To do so, I have installed R-2.12.0. (dmg), neccessary libraries for JGR and JGR (ui for R) following these instructions:

install.packages(c("rJava","JavaGD","iplots"))
install.packages("JGR")

Unfortunately I can not load JGR library, because I got an error within iplots library:

> library(JGR)
Loading required package: iplots
Note: On Mac OS X we strongly recommend using iplots from within JGR.
Proceed at your own risk as iplots cannot resolve potential ev.loop deadlocks.
'Yes' is assumed for all dialogs as they cannot be shown without a deadlock,
also ievent.wait() is disabled.
Error in .jnew("org/rosuda/iplots/Framework") : 

java.lang.NoClassDefFoundError: Could not initialize class org.rosuda.ibase.Common
    Error: package 'iplots' could not be loaded

I can not find any information on this issue or similar one. Does somebody manage to run JGR on MacOs 10.6? Has anybody got such an error?

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Problem with iplots library which prevents JGR to start on macos

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