in my web app , the user can view an excel sheet edit and save it back. when it get saved i need to insert the data in oracle. Im using tomcat as my web app server. using hssf-poi i want to implement this. but dont know where to palce the jar file. i put the jar file(commons-logging.jar) in tomcat common/lib but the page gave me an error package org.apache.poi.hpsf does not exist import org.apache.poi.hpsf.*; where i went wrong? can anyone guide me????/