In AMQ 7, setting the maximum number of consumers for a queue to one did not work the same as for an "exclusive consumer" in AMQ 6. In AMQ 6, an exclusive consumer means that one consumer will receive all of the messages. Any other consumers are still registered, just not consuming messages. When the current exclusive consumer leaves the queue, another consumer becomes the exclusive consumer. Previously in AMQ 7, if you set `max-consumers` = `1` for a queue, when this limit is reached, the broker returned a `AMQ119200` error and did not allow any new consumers to join the queue. This error no longer occurs.