what server side language is gmail written in?
Based on what I know about Google, I'd say Java or C++. Maybe Python. Google only uses four languages, those three, and Javascript on the client side.
Most likely Java.
I guess google has there own web development framework based on java, like yahoo has yui
A few services including code.google.com and google groups. Most other front ends are in C++ (google.com) and Java (gmail). All web services are built on top of a highly optimizing http server wrapped with SWIG.
Gmail is written in JavaScript, as recently revealed by De Boor in a Computerworld article. It currently consists of 443,000 lines of JavaScript, all of it written by hand.
it's been write in Javascript
At the USENIX annual conference last month, Gmail engineer Adam de Boor surprised the audience by noting that the company's Gmail service was written entirely in JavaScript, and that all of its code, around 443,000 lines worth, was written by hand.
http://infoworld.com/d/developer-world/google-executive-frustrated-java-c-complexity-375