Yes, that is what the scheme I described is doing. You'd need a similar mechanism in Rust too to prevent it from collecting objects prematurely. I think impleme

Yes, that is what the scheme I described is doing. You'd need a similar mechanism in Rust too to prevent it from collecting objects prematurely. I think implementing this is fairly trivial. The difficult part of writing an FFI is handling closures: Java calling Python calling Java calling Python which throws an exception...