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Session tracking

 
Gaurav Chikara
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Hi All
I m using javawebserver2.0 trial version
I m using HttpSession object for session tracking
in which I put a vector in my first servlet where i create this session
through this servlet i popup a jsp through a hyperlink
and after entering some values in input fields of that JSP
i add those values in a vector and add that vector to the vector which i put in session object in the first servlet
Now on submit button of jsp i call another servlet in which i try to retrive values of the session vector .
Problem i am facing is that
on first time whenever i load my first servlet and reach to last servlet via JSP
it always give nullpointerexception but if i refresh the browser and reload the first servlet it starts working fine
Can anyone pls give me a hint where i may be wrong
 
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