UMFactory initialization error with login module

I've written a custom login module that has the following code:
IUserFactory userFactory = UMFactory.getUserFactory();
which causes an IllegalStateException with the following detailMessage: Could not initialize UMFactory! Please set property 'ume.cfg.path' or call UMFactory.initialize() first.
I've found a bunch of other postings relating to this problem but none seem to have discovered the answer. Does anyone know how to resolve this? I was under the impression the method getUserFactory() could be called without any initialization?
Cheers,
Steve

Hi Steve,
Please look at this.
/thread/3107 [original link is broken]
Regards,
Siva
P.S: Award points if you fidn this useful.

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import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.Callback;
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import com.sap.engine.lib.security.http.HttpGetterCallback;
import com.sap.engine.lib.security.http.HttpCallback;
import com.sap.engine.lib.security.LoginExceptionDetails;
import com.sap.engine.lib.security.Principal;
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// throwUserLoginException(e, LoginExceptionDetails.IO_EXCEPTION);
// userName = nameCallback.getName();
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Regards
Ramanender Singh

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I am stuck with the following issue:
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UMFactory initialization error with login module

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