The .jsp extension can be a bit of a misnomer. I have worked on many a website where you wouldn't know that it was powered by Java just by looking at the URL.
Plus, often the .jsp extension is hidden, such as with
Struts applications where the extension is .do
Actually, in Struts, the extension can be anything. I've worked on projects where the struts extension was actually .html, so everyone coming in thought the site was just served up by a web server.
Some clients have scary requests.
From the number of banks, insurance agencies, government offices and banks that I have worked for, I can tell you that Java is well represented.
-Cameron McKenzie