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i'm currently maintaining a small web-app running on Websphere.
We got a form-based login that is working, using a Custom user registry to check informations on user from a LDAP and a SAP system.
My problem : depending on the reason for logon failure, we would like to get a different error message. The customUserRegistry errors contains the textual infos i need, but i can't seem to be able to get the error causing the failure in the login_error.jsp page.
I'd like to help but you need to go into more specifics of your problem. What kind of web application are you running? Why can't you use a try/catch block in the JSP page to read the error then re-write your own output to the user. Not the best solution, but again it depends on your setup and system.