[jamessinghal]

Yes but it would just be the hot loop in this case; the rest of the app can still be in idiomatic Java, and you still get the GC.

[lolinder]

Exactly. Write it in Java, optimize what you need to, leave the rest alone.

[pjmlp]

As polyglot dev, I never understood this religious approach that it has to be 100% pure unadulterated in language XYZ for performance.

Nope, embrace the productivity of managed languages, if really needed, package that rest in a native library, done.