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FormLoginServlet handles login forms so they meet the criteria outlined in the Servlet 2.2 specification. Namely, usernames and passwords are saved to fields called j_username and j_password respectively. The action attribute is automatically set to j_security_check, as required by the Servlet 2.2 specification, to ensure that after the form is submitted, the user is directed to a page within the current Web application. The j_security_check parameter is resolved during runtime: FormLoginServlet examines the user’s security information and sets j_security_check to the appropriate destination URLs contained within FormLoginSession.
