They post regularly Java and Clojure positions.

Apple has gotten into Java since OS X early days, when they weren't sure about the current generation of Mac OS developers being willing to adopt Objective-C.

So there was Cocoa Java Bridge, QT for Java, their own JVM and WebObjects was rewritten in Java.

Even though they got ridden of their Java OS X bindings, WebObjects still powers the Apple Store, for example.

Actually Apple uses Java/Scala a lot, and some of the core contributors to Netty are Apple devs.