I don't know that much about struts, I will give you a solution for basic JSP and servlets which i think it would be better.
normaly you would be storing the User object in the session, so i would suggest to create a Filter and then in its doFilter method check if there is a user object in the session, if it's not then redirect to the login page.
in the mapping of the filter in the web.xml spcecify to which URL's you want that filter to be applied.
Omar Al Kababji - Electrical & Computer Engineer
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