Place below code in Theme default.JSP if you want implement session timeout using this approach in WebSphere Portal Applicaiton.
SessExpire_Test.JSP
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
<meta http-equiv="refresh" content="<%= session.getMaxInactiveInterval() %>;url=dummy_login.jsp">
</head>
<body>
<h1>Hi, !</h1>
Your session will expire in <%= session.getMaxInactiveInterval() %> seconds at which time your browser will be redirected to the login page and all your unsaved changes will be lost.
<br>Test Information!
</body>
</html>
dummy_login.jsp
<%@page contentType="text/html"%><%@page pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page</title>
</head>
<body>
<h1>You have reached this page because your session has timed out.</h1>
</body>
</html>
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