Benchmark newer Java API

[LifeIsStrange]

Java has a new FFI API https://openjdk.java.net/jeps/419
which has different performance characteristics.
Using jdk 18 (stable) would be fair too.

Also for Java c++ interop, the best library is
https://github.com/bytedeco/javacpp

[dumblob]

I'd be also interested in this benchmark.

[Ramblurr]

I added this in my fork https://github.com/ramblurr/ffi-overhead?tab=readme-ov-file#results-2025-08