@ounos said:
Just make two threads, one thread constantly creating objects, second thread constantly reading them, invoking a method on them and checking whether this == null. In the first 5 minutes you'll get it, in a dual core machine.
Interesting idea! Our production server is multi-core so I thought that would be the best place to try. Have been running for half an hour and still no sign of a null this, but terminal now seems very slow so maybe one's about to happen. Shall I keep going?