Help getting user ID

Hello! i am a bit of a newbie to JSP and I have a problem. I am trying to run a simple jsp page that when run will display the id of the person logged into the PC. We are using tomcat and I have been trying the following
<html>
<head><title>Hello</title></head>
<body bgcolor="white">
<h2><font color="black">Hello,
${pageContext.request.userPrincipal.name} !</font></h2>
</body>
</html>
but all this does is return
"Hello, ${pageContext.request.userPrincipal.name} !"
So far I have not been able to figure this out. Would anyone know what I am doing wrong?
Thanks in advance

when user login your application, save user's id in a session :
String userId = request.getParameter("userId"); // assume you sumbit a form which has a field named "userId"
request.getSession().setAttribute("userId", userId) );
then, in your jsp, you can do:
<c:out value='${sessionScope.userId}' />
Hope that helps.

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