Output different from output in book

[mghildiy]

On page 152, following code is implemented for subscribeOn:

log("Starting");
final Observable<String> obs = simple();
log("Created");
obs
.subscribeOn(schedulerA)
.subscribe(
x -> log("Got " + x),
Throwable::printStackTrace,
() -> log("Completed")
);
log("Exiting");

Book output is:

35 | main | Starting
112 | main | Created
123 | main | Exiting
123 | Sched-A-0 | Subscribed
124 | Sched-A-0 | Got A
124 | Sched-A-0 | Got B
124 | Sched-A-0 | Completed

But when I implement same code, I don't get output for scheduler:

0	| main	| Starting
81	| main	| Created
83	| main	| Transformed
94	| main	| exiting

Program exits even before scheduler thread starts working. To get output from scheduler thread, I have to make main thread sleep at end.