To get our .jsp files to work, we had to copy standard.jar and jstl.jar from the jsp-examples folder into the WEB-INF/lib folder where the .jsp code was located.

The .jar are at /var/lib/tomcat5/webapps/jsp-examples/WEB-INF/lib

If the .jsp page is located in /myDir, then the .jar should be put in /myDir/WEB-INF/lib
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Shannon Morrison