Answer Posted / ruchi

when we create session , we write
HttpSession session= res.getSessionn(true);
this checks whether there is a session bind on associated
request.if yes then it returns reference to session
object,otherwise create a session for associated request.

but if we want check that session is alive or not then we
write
HttpSession session= res.getSessionn(false);
this checks whether there is a session bind on associated
request.if yes then it returns reference to session
object,otherwise it returns null reference.

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