There's OpenJDK, there's a huge ecosystem surrounding java, and java is one of the few languages that can hold a candle to C-ish performance server-side. While

There's OpenJDK, there's a huge ecosystem surrounding java, and java is one of the few languages that can hold a candle to C-ish performance server-side. While being safer than C and less insane than C++. I doubt it will leave anytime soon.