Java: Atomic Variables

It may not manage multi-field updates atomically.

AtomicReference is limited for complex data structures where you need to update multiple fields atomically. This is because it only provides atomicity for single reference updates. In scenarios where multiple fields need to be updated together, such as decrementing inventory while updating the number of sold items in a complex `Inventory` object, AtomicReference alone might not suffice without additional locking or algorithms.