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Google is heavily reliant on Java. LinkedIn and Twitter both use Scala and Java. I'm not really sure that pointing out that Google has some C++ code really disproves that Java is used heavily at google. Java is still very widely used, more so than more fashionable languages like python and ruby, but the syntax is a bit long on the tooth, hence the popularity of Scala, Clojure and Groovy.

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" I'm not really sure that pointing out that Google has some C++ code really disproves that Java is used heavily at google. "

Of course not

"Java is still very widely used, more so than more fashionable languages like python and ruby""

Yes, but "widely used" is a tricky term, I'm sure cases both for and against can be found.

But to talk about Google, last I heard it's only possible to develop application there in the following languages: JS, Java, C++, Python (there are exceptions of course, for specific libraries or things like ObjC for iOS)

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