Flex Session implementation in Java

Hi
I am new to Flex. I have requirement like "store and retreiving a value in FlexSession instead of passing it to UI". The application in which I am working is an existing application where the value which I mentioned is generated from a service call and storinand reteiving it inside a DB. I neeed to modify it so that it should be from Flex Session.
I tried using FlexContext.getFlexSession().setAttribute("abc","value");
But while retreiving through FlexContext.getFlexSession().getAttribute("abc") it is returning null.
Could somebody help in finding a solution for this. It is urgent.

Thanks for your reply Claudiu. FlexContext comes from flex-messgaing-core.jar and I don't think it is a custom class. And my issue got solved . I think I missed the below entry in web.xml,

<llstener>
<listener-class>flex.messaging.HttpFlexSession</listener-class>
</llstener>

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"Sandeep Suri" <[email protected]> wrote in message
news:[email protected]..
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Revision: 23961
Revision: 23961
Author:   [email protected]
Date:     2012-06-15 04:42:44 -0700 (Fri, 15 Jun 2012)
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Revision: 23960
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Revision: 23948
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Author:   [email protected]
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