Not with the Unsafe class. It was never intended to be used by anything except the built-in concurrency support classes, and it was just barely good enough. External libraries which made use of the Unsafe class did so by studying how it was used, and then assumed/concluded how it worked. Java 9 formalized everything with the VarHandle class, and it offers much more features than the Unsafe class.

Thanks for the clarification. Java was obviously a trailblazer on formally introducing advanced memory models on practical languages, but it did take a few tries to get it correct.