from the install notes
IMPORTANT!! After opening the GeoNetwork homepage, log on
as Administrator. You should use the username admin and
password admin. In the Administration section you can then modify
your account.
Running GN 2.2.0 RC2 using Jetty. Try to login as admin/admin. Get the
following error
Error
The requested operation could not be performed.
NullPointerException :
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Puneet Kishor