Can I use SimpleFdkCredential() from within a servlet?

I have a test program that logs in to content DB using SimpleFdkCredential, and works perfectly well run from the main() method of a Java class from within JDeveloper. When I try to login the same way from within the doGet() method of a servlet, doGet() hangs on the call to ManagersFactory.login() using the same SimpleFdkCredential that works in-process. The login() call doesn't throw any exceptions, it just sits there waiting[I presume], and never returns.
Is it necessary to use S2SFdkCredential for any authentication that originates from a servlet invocation? It seems that SimpleFdkCredential should work in this instance as well.
Thanks.

Can you check the Content DB http node log (application.log) with debug log level set, to see if the request from the servlet for the RemoteLoginManager Web Service was received?
I would also check that all libraries are present/accessible from servlet - and that there are no conflicts with existing libraries.
Also, check the servlet log for anything strange.
Finally, you could try remote debugging of your servlet .. e.g -Xdebug java option.
-Matt.

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