JAMon comes with a
servlet filter that tracks various statistics for every jsp, servlet, gif, jpg etc including hits, avg time, max time, min time, max concurrency and more. JAmon is simple to use and using the servlet filter should only require minimal effort to incorporate. It is fast enough to monitor in production systems, and is in your war, so no special installation is required. The demo available at
http://www.fdsapi.com uses the jamon servlet filter. It aslo monitors all
jdbc calls and more.