In the pre-authenticated authentication case (unlike CAS, for example) the user will already have been identified through some external mechanism and a secure context established by the time the security-enforcement filter is invoked.
Therefore this class isn't actually responsible for the commencement of authentication, as it is in the case of other providers. It will be called if the user is rejected by the AbstractPreAuthenticatedProcessingFilter, resulting in a null authentication.
The commence
method will always return an HttpServletResponse.SC_FORBIDDEN
(403 error).
@see org.springframework.security.web.access.ExceptionTranslationFilter
@author Luke Taylor
@author Ruud Senden
@since 2.0
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