[data37]

It depends on what you mean by a "website". You need to understand that a web application need to have a client-side (managing user interaction) and a server-side (mostly fetching data). Java is still more popular than any other technology for the server-side part. May be you should read more. And think more.

[ehsan_akbari]

I meant the back-end. Noone bothers to write the front-end with these languages ( ASP.Net is an exception ) when there are tons of great JS libraries avalable.