Thrown if an authentication request could not be processed due to a system problem that occurred internally. It differs from {@link AuthenticationServiceException} in that it would not be thrown if an external system has aninternal error or failure. This ensures that we can handle errors that are within our control distinctly from errors of other systems. The advantage to this distinction is that the untrusted external system should not be able to fill up logs and cause excessive IO. However, an internal system should report errors.
This might be thrown if a backend authentication repository is unavailable, for example. However, it would not be thrown in the event that an error occurred when validating an OpenID response with an OpenID Provider.
@author Rob Winch
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