Two things: (1) It looks like you might have a method name there and
not a class name, and (2) it looks like you are using "." as a
separator instead of "/". ("." is Java surface syntax for separating
package names, but "/" is what is used at the API boundary.) So, I
would check to make sure that your JNI registration code is
well-formed.
If this isn't your problem, then maybe you can provide a bit more
context (e.g., actual source code) which might help guide further
suggestions.
-dan