Classpath IPP Logging

Does anyone here have any idea how to turn on IPP logging in GNU Classpath?
It's used like:

          logger.log(Component.IPP, "Attribute: Name: <" + jobUri.getCategory()
            .getName() + "> Value: <" + jobUri.toString() + ">");
 
It would be very useful to enable this, but I just can't figure it out.

Thanks,
Andrew.