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HttpSession became null  RSS feed

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i have a Jsp which renders tables dynamically through display tags.
The table acts as a tree structure.
Each tree has a node which when clicked, calls a Ajax where the request is passed to a servlet in POST method.
In the servlet i am using session variables for validation.
I am using weblogic web server.

The actual issue is when the no. of trees rendered in the table is less say abt 40 to 50. then i click the node to get the information from the server thro AJAX, the session exists.
When the no.of trees increases say about 70 or more and then i click any of the node which calls the AJAX which invokes a servlet, the request.getSession() becomes null and and the whole application is goin for a toss.

I have tried several solutions but nothing worked out.
Is there a solution for it . Please reply ASAP.

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