How your configuration in web.xml looks like?
Do you log error with an exception caught? I believe LogDigger sends
notification only if exception was logged (although it would be simple
to change this).
Did you test your setup as described at the end of guide document?
http://logdigger.com/logdigger-connector/guide/
(BTW, no, you don't need to use My LogDIgger service in order to use
LogDigger library.)
Regards,
Radomir