"Page not found" error while fetching data using tomcat

Hi all
We have a java web application that runs on a distant server . The web server is apache tomcat . The database used is oracle. We upload large data to the site and generate various reports. We are using servlets for this purpose. But when there the amount of data fetch is larger, the browser shows "Page not found" error . We tried to increase the time out of the web server but it didnt work . Is there any solution to this problem ?
Thanks & Regards
Ashish

Yup, don't fetch everything at a go!
Google around for optimization techniques. I know one site called "javaperformancetuning" or something of that sort. It has some interesting articles on how to do this.
Rich.

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