Andy,
This seems to be a lookup from a standalone client (not an appclient).
So, you need to do everything (possible) that appclient does :)
One of the things is to have all the classes in your application's classpath. This class is in install-dir/lib/appserv-admin.jar. Please place that jar in your classpath. Then this error would go away.
You may get into another error. At which point take a look at: install-dir/bin/appclient and then try
to add all the jars referred to there.
Better yet, use Java WebStart support that Tim Quinn has added :)
Regards,
Kedar
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