Java: waiting on synchronized block, who goes first?

Question

This question is inspired by this other question.

If multiple threads are waiting on a synchronized block, and the lock becomes available, who goes firs

Answer 1

According to this guy: http://tutorials.jenkov.com/java-concurrency/starvation-and-fairness.html

Java issues no guarantees about the sequence. So I guess it is not based on thread priority

I'll try to look further for an explanation on how Java actually decides who goes first.