With JSPs, as long as Jasper (the Apache Jasper component) is directed to check the JSP, you don't need to redeploy the whole WAR. Just update the JSP file and access the page. Depending on the settings you have for Jasper, it will check for changes and recompile if necessary. The default configuration for Jasper in Tomcat and Jetty embedded systems should allow this to work out of the box. Just checked on my test system.
Appreciate the answer. Will try. Thanks.