In Application Server 7, users were able to specify the following system property to optionally turn on some ORB performance optimization:
-Djavax.rmi.CORBA.UtilClass=com.iplanet.ias.util.orbutil.IasUtilDelegate
The ORB performance optimization is turned on by default in Application Server 8.1. If you are using the system property reference above, you must remove it to avoid interfering with the default optimization.