Pointers only hopefully of some help.
iplots should work as you have described, however there have been a number
of different versions of JGR each for a different version of R - have you
got the correct version?
I believe JGR shouldn't work as you have described, even though I have no
experience
iMac Intel Core Duo; OS X 10.4.8; Java 1.5.0_06; R 2.4.1; JGR 1.4-14; rJava
0.4-12; iplots 1.0-5
I'm unable to get JGR or iplots to load using library(JGR) or
library(iplots), respectively. This feels like it might be a classpath or
Mac look-and-feel issue, but I'm not sure where to go with it
