problems with assigning a value to object session

[osval]

I'm trying to assign a value to the object session :

<@ page session="true">
String var_name = "name";
String var_value = "value";
session.putValue(var_name,var_value);

Then I'm submitting to the same page and trying to read from the session :

String get_val = (String)session.getValue("name");

It always gives me "null".
I'm trying to get session object like that:

"HttpSession session = request.getSession(true)"

But every time I'm calling session.isNew() it returns me "true".
Do you know what's the problem?
thanks

[Jack]

get/setValue of the HttpSession interface have been deprecated. Try using setAttribute(String, Object) and getAttribute(String)