Loosing session

I created 2 very simple files and trying to set session attribute in one of them and retrieve it in the next one. There is a link from the first to the second.
I always get new session in the second JSP.
Source of the 1st file :
<%@ page import="java.sql.*"%>
<%@ page import="java.lang.*"%>
<%@ page import="java.io.*" %>
<%@ page import="java.net.URLEncoder" %>
<%@ page import="java.util.*" %>
<%@ page import="javax.servlet.*" %>
<%@ page import="javax.servlet.jsp.*" %>
<%@ page session="true"%>
<%
session.setAttribute("test_attr","_data_sample");
%>
<html>
<head>
</head>
<body>
<%
String in_session = (String)session.getAttribute("test_attr");
out.println("Session attribute value is : " + in_session + "<br>");
out.println("Session ID : " + session.getId() + "<br>");
out.println("Is Session new : " + session.isNew());
session = request.getSession(true);
out.println("Did we join the session : " + session.isNew());
%>
Click here
</body>
</html>
source of the 2nd JSP :
<%@ page import="java.sql.*"%>
<%@ page import="java.lang.*"%>
<%@ page import="java.io.*" %>
<%@ page import="java.net.URLEncoder" %>
<%@ page import="java.util.*" %>
<%@ page import="javax.servlet.*" %>
<%@ page import="javax.servlet.jsp.*" %>
<%
session = request.getSession(true);
String new_str = (String)session.getAttribute("test_attr");
out.println("Test session value : " + new_str + "<br>");
out.println("Session ID : " + session.getId() + "<br>");
out.println("Is Session new : " + session.isNew());
%>

Put session.setAttibute after html tag in first page, sometimes work :D

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