Session Management in the gwt-ext

Hello All
I am working on the gwt-ext application.On the server side I am using
Hibernate.I am mantaining session on the server side.it's time out is
5 minute (In action class).
Now take a secenario in which a user logged in & remains it open for
five minute.After five minutes expires it do a click on a button on
the screen.There is some process on the client side & it is of 2
minutes and after that it goes for a server call.When it go for server
call it is already session out (as session time is 5 minutes which is
already expired).And a message of session out popped up with
redirecting the login page.
In this whole case user feels that I am active on the system so why I
am redirected to login page.
Reason behind is that that session is maintained on the server
side.And server hit is after seven minutes.
So I am thinking to maitain the session on the client side also.How to
achieve this in the gwt based application.
Is there any other way to do solve this issue.
Thanks to all.

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