“Cannot reproduce” - is Java deterministic multithreading possible?

Question

Is this possible to run multithreaded Java application in a deterministic fashion? I mean to have always the same thread switching in two different runs of my application.

Answer 1

I am not aware of any practical way to do this.

In theory, it would be possible to implement a bytecode interpreter with an entirely deterministic behavior under certain assumptions¹. You would need to simulate the multiple threads by implementing the threads and the thread scheduling entirely in software and using a single native thread.

---

^{1 - For example, no I/O, and no use of the system clock.}