Is there anything remotely "complicated" that has been really successful in industry? Java is about as basic as you can get, it doesn't even stretch its OO and

Is there anything remotely "complicated" that has been really successful in industry? Java is about as basic as you can get, it doesn't even stretch its OO and imperative parts a lot, never mind other programming paradigms. C# has a few more elaborate parts, but I wonder how much use the more "arcane" subsystems get in larger code bases…