Hi, I'm trying to use j2r with the sensitivity R package http://cran.r-project.org/web/packages/sensitivity/index.html I've installed R 2.10.1, sensitivity 1.4.0 and Rserve 0.6-1. Following commands are OK in the R shell: library('sensitivity') fast99(model = NULL,factors=3,n=1000,q='qunif',q.arg=list(min=-1,max=1)) but if I try the same with j2r, I've got: Exception in thread "main" java.lang.NullPointerException at org.nuiton.j2r.net.RNetEngine.convertResult(RNetEngine.java:302) at org.nuiton.j2r.net.RNetEngine.convertResult(RNetEngine.java:293) at org.nuiton.j2r.net.RNetEngine.convertResult(RNetEngine.java:293) at org.nuiton.j2r.net.RNetEngine.convertResult(RNetEngine.java:293) at org.nuiton.j2r.net.RNetEngine.eval(RNetEngine.java:169) at org.nuiton.j2r.RProxy.eval(RProxy.java:154) My java code is: Engine rengine = new RProxy(); rengine.eval("library('sensitivity')"); rengine.eval("fast99(model = NULL,factors=3,n=1000,q='qunif',q.arg=list(min=-1,max=1))"); If someone have an idea… -- Nicolas Dumoulin Ingénieur d'études - Cemagref, LISC +33 (0)4.73.44.07.29