How to modify java classes in tomcat

Hi friends,
I have jsp which calls some java classes,i want to modify code in one of the java class .Please tell me what are the steps required.
Thanks
Naresh

Classes involved in web-apps are compiled from a source tree outside of Tomcat. The class files are then installed in either WEB-INF/classes or inside a jar in WEB-INF/lib.
The source code is quite separate from the Tomcat server, and you're going to have to track it down. Normally the source for a web-app (including fixed pages and JSPs) is compiled and wrapped up in a "war" file (a kind of jar) and distributed to the web server like that.
There may well be an ant script for the job.

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