Apple used Java in a ton of backend stuff. At least the entire backend for iTunes (Jingle) was written in Java and very very small amount of Clojure.
> Clojure
Apple should do more of that - they make cool computers, and should use cool languages.
One only need look at the job postings for Apple to see quite how common Java backend is there.
> entire backend for iTunes (Jingle) was written in Java
Wasn't that because iTunes started out as a NextStep WebObjects application? WebObjects started on Objective C, transitioned to a framework for Java in early 2000's, came to Apple with the Next acquisition.
iCloud is mostly Java (or was, about 10 years ago when I was there)
There was a time (around the beginnings of Mac OS X) when Java was considered a first class citizen in Mac OS X, next to Objective-C.
Some NeXT products like WebObjects got ported to Java (and ran not only the iTunes backend but also things like the original Dell online store) and there was something called the Java bridge which allowed you to program Cocoa applications with Java.
https://developer.apple.com/library/archive/documentation/Co...
Oh, and with Yellow Box for Windows, this was also possible on Windows.
If you look at the screenshots here, it's mostly Windows 2000: https://developer.apple.com/library/archive/documentation/Le...