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https://issues.apache.org/jira/browse/SLING-1196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779850#action_12779850
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Felix Meschberger commented on SLING-1196:
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Yes, makes sense, though I would not but the login exception as a whole but 
rather the message of the exception (which may well be null !).

> Sling Authentication - SlingAuthenticator hides LoginFailure reason
> -------------------------------------------------------------------
>
>                 Key: SLING-1196
>                 URL: https://issues.apache.org/jira/browse/SLING-1196
>             Project: Sling
>          Issue Type: Improvement
>          Components: Engine
>    Affects Versions: Engine 2.0.6
>            Reporter: Hakim Sadikali
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> The SlingAuthenticator does not provide the handler with the reason a login 
> failed, it only logs the reason and proceeds to try again:
> // request authentication information and send 403 (Forbidden)
>             // if no handler can request authentication information.
>             log.info("authenticate: Unable to authenticate: {}",
>                 reason.getMessage());
>             log.debug("authenticate", reason);
>             login(request, response);
> Applications often want to provide more detailed information to the end user, 
> username not found, password does not match username etc.   
> An easy solution would be to put the LoginException in the request for the 
> login handler to have access to it, and then remove it after the login 
> handler has processed the request - works but not particularly elegant.

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