Urgent - problem with session objects

[ashaikhhafiz@xxxxxxxxx]

Hi !
i have a session object in which we put the user object, which contains the
user information of the user who has logged in. The first time i use the
search criterions, the session object is not null and the user object which
i retrieve from the session object is also neither null. but the second
time onwards the session object is not null, but the user object which i
retrieve from the session object is null. sometimes the session object is
also null even though the session timeout time is not elapsed. the session
timeout time is 30 mins. but when i use it the second time itself, when i
check if the session object is null, it returns me null.
plz help me out with this. it's quite urgent.
Thanks & Regards
Azeem.

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