# The same OrderService built with plain 'new', no Spring anywhere


--- constructor injection ---
new ConstructorOrderService(gateway, notifier).place("A-1", 500)
  OK -> charged 500 cents for A-1
  charges=1, notifications=1

--- setter injection, one setter forgotten ---
new SetterOrderService(); setter.setGateway(gateway);   // setNotifier never called
  NullPointerException: Cannot invoke "com.ankurm.coredi.injection.Notifier.send(String)" because "this.notifier" is null
  charges=1   <-- the customer was charged before the failure

--- field injection ---
new FieldOrderService().place("A-3", 500)
  NullPointerException: Cannot invoke "com.ankurm.coredi.injection.PaymentGateway.charge(String, int)" because "this.gateway" is null
after ReflectionTestUtils.setField(...) twice:
  OK -> charged 500 cents for A-3