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by pjmlp 1044 days ago
Yes, they do. Many people don't get the point across that Java is like C and C++, there are plenty of implementations.

Regarding OpenJDK, here are some examples,

Amazon has Lambda SnapStart into their implementation, Azul uses a LLVM based JIT, their own pauseless GC and extensions for value types (ObjectLayout), Red-Hat ships Shenodah.