auto-create destinations when consumers are added to the broker (assuming auto-create is enabled) to help implement Virtual Topics.. For more background see: http://www.nabble.com/Re%3A-Virtual-Topics-%28was-Re%3A-Failover-topic-subscribers%29-tf1942508.html#a5332644
incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/AbstractRegion.java