Thank you for your reply .
I use IE 6 as my browser in windows and tomcat on HP unix.
I meant that ,all I did was open a browser window load my application,
goto a particular page Set page to refresh for every 10 secs(
application had a combo box to set interval of refresh).After few
refresh I get a null pointer exception and realize that the session is
null suddenly .( I repeat I don't get this issue when I run tomcat in
windows)
Anyway, first try to localize the problem, there are some ways:
* implement javax.servlet.http.HttpSessionListener interface to see what's happening with your sessions;
* install RequestDumperFilter filter into your application to see every request and response data;
* sniff HTTP traffic (don't know how...)
* try another browser (I don't force you to throw IE, just try another one), for example Mozilla has excellent tool named "Live HTTP headers" which shows all HTTP request/response headers.
That way you will see if a session invalidates normally for whatever reason or it "lost" somehow.
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