This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori 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.