classpaths problems

I have an API that I want to use in a RPG program.  The API(jar) is
dependant on 3 other jar files.  I have written ILE prototypes over the main
class I want to use.  I can create the instance of the class, run some
methods of the class, but 1 method that relies on other jars fails with a
class not found exception.  I have all 4 jars added to the same classpath
but for some reason it tells me class not found on one of the dependant
classes.

I also created a Java program that does the same thing as the rpg pgm and
placed it on the IFS, under qsh I can compile and run the method fine.  I
use the same user for qsh/java as I did for the rpg, the classpath is the
same for both yet the rpg tells me class not found.

I noticed that the first time I ran my rpg it linked the jar files to
something, initially I was using an older version of the jar file that
didn't need the other 3 jars.  Is it possible that the old jar is still
linked to something?  If so how can I "unlink" it.

I have no idea if that is the problem or not but it might be helpful for
somebody who knows something about rpg calling java methods.  I am
completely stuck right now and I am open to any suggestions.

Thanks,
Robert