How to redirect to login page if not logged in

hi,

i have a tomcat web application and it is working properly. i have only javascript and jsp but if user types any url of any jsp without login its displaying that page for that i written the code like this in jsp.... but its not working........ so any one please help me...........

the code is

<% if(null == session.getAttribute("username")){
response.sendRedirect("./jsp/logout.jsp");
}else { %>
<a href="../jsp/useradmin.jsp?">Add User </a> <%} %>

this is not redirecting to login page if i entered url useradmin page directly without login. any one please tell me sollution..

Have you tried printing the value returned by session.getAttribute("username") to the screen to see what it is returning.

I know in .net how would this happen but dnt know in java.

have you tried spring security ? it has such feature out of box.