Why does Object.hashCode() return the same value across runs

So the default implementation of hashCode() on HotSpot returns a random value and stores it in the object header. This doesn't seem to have changed in Java 8 where the hash value is calculated by a call to os::random():

static inline intptr_t get_next_hash(Thread * Self, oop obj) {
  intptr_t value = 0 ;
  if (hashCode == 0) {
     // This form uses an unguarded global Park-Miller RNG,
     // so it's possible for two threads to race and generate the same RNG.
     // On MP system we'll have lots of RW access to a global, so the
     // mechanism induces lots of coherency traffic.
     value = os::random() ;
  } else
...

What I'm wondering is why hashCode() always returns the same value, also after shutting down the JVM which I tried by executing the simple test below, restarting my machine and then running main() again.

public class SimpleTest {
    public static void main(String[] args) {
        Object obj = new Object();
        System.out.println(obj);
    }
}

How can the output be the same everytime if hashCode() is actually os::random()?

Thanks a lot in advance.

---

java -version gives

java version "1.8.0_40"
Java(TM) SE Runtime Environment (build 1.8.0_40-b25)
Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)