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Container based authentication

 
Ranch Hand
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Suppose I use container based form based authentication (j_username, j_password).
Suppose I request for a constraint resource and since its a constraint, container will ask me for authentication. Once I authenticate myself , the container will forward the request to requested constraint resource. Now in the constraint resource is there any way to get the user name that was used by the user and against which the container authenticated.
I tried
a) request.getParameterNames()
b) request.getQueryString()
Both these methods do not contain the user name.
 
Rancher
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The HttpServletRequest.getRemoteUser method returns the user name after a successful authentication.
 
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