QF22 is NRT-SYD. QF will call up people the day before and offer O/D pax alternate routings via HKG, SIN, PER, etc. sometimes with an upgrade sweetener. Doubt the flight will be overbooked at departure, esp. with JL being a partner. Connecting pax will get priority in accomodation, fwiw. Worst case some get bumped and stay overnight at NRT hotel. Unlike US airlines with $2000 bump vouchers, QF won't be giving out any.
You might have a reasonable chance for a J upgrade, chances are J0 was done due to Y overbooking, not J oversold. Also you could volunteer to go via HKG or SIN for a J upgrade, if you have the time and want the longer routing.