This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I'm not very sure what you are trying to do, but if my guess is right, you want to change / modify some JSP code without redeploying your war file. If thats the case, find out the path where the web app has been undeployed and modify the JSP. You might need to delete the generated servlet for the JSP to be recomplied.