[R] rJava classpath issues

From: Munir, Danish <danish.munir_at_lehman.com>
Date: Thu, 12 Jun 2008 18:09:08 -0400

I'm having some issues with getting my own jars to work properly with rJava.
Bear with me as I explain my scenario:

I have a java package called rjbridge, with the following classes: RJBridge.class
ObjectInfo.class
....
....

Each of the classes has the following line on top: package com.rjbridge

My directory structure is:

/home/Danish/java/com/rjbridge
All the class files lie in the above directory I use the following commands to compile and jar:

cd /home/Danish/java
javac -d . ./com/rjbridge/*.java
jar -cvf rjbridge.jar ./com/rjbridge

So far, so good. Everything works as it should, and I can use the RJBridge class as follows:
java -cp /home/Danish/java/rjbridge.jar RJBridge [args]

and it runs fine.

Now in R, when I try the following:

>library(rJava)
>.jinit()
>.jaddClassPath("/home/Danish/java/rjbridge.jar")
> r<-.jnew("ObjectInfo")

I get,
Exception in thread "main" java.lang.ClassNotFoundException

        at RJavaClassLoader.findClass(RJavaClassLoader.java:195)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:242)
Error in .jnew("ObjectInfo") : Failed to create object of class `ObjectInfo'
In addition: Warning message:
createObject.FindClass ObjectInfo failed in: .jnew("ObjectInfo")

Trying:
> r<-.jnew("rjbridge.ObjectInfo")

Gives the following:

Exception in thread "main" java.lang.ClassNotFoundException

        at RJavaClassLoader.findClass(RJavaClassLoader.java:195)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:242)
Error in .jnew("rjbridge.ObjectInfo") : Failed to create object of class `rjbridge/ObjectInfo'

I've spent a lot of time trying this in a number of different ways, but to no avail. Will some kind soul help me out here?

Thanks
Danish
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