>Hi all,
>I have a different servlets which does the different functions such as add,
modify, delete & view. At the end of each function, the session arributes
gets >removed.
>One can try click on the back button of the browser & view the cached
version of pages and also may click on some functional buttons. Since the
all the >session buttons are removed, on click of functional button gives me
the null pointer exception.
>Please suggest me the general approach to handle this kind of scenario.
>Thanks in advance,
>Ashish.
you may point browser not cache docoment
response.setHeader("Cache-Control", "no-cache"); /*http 1.1*/
response.setHeader("Pragma", "no-cache"); /*http 1.0*/
and set expires date
long currentTime = System.currentTimeMillis();
long min = 1*60*1000; /* 1 min */
response.setDateHeader("Expires", currentTime + min);
Yuriy
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