Minor Description
When a JMS queue is used as a camel consumer for a route it may well be one of possibly many intermediate stops in a chain of processing. If the previous processing step itself used Camel to route the message, then both the JMS replyTo and the camel-header JMSReplyTo will both be populated with the same value. This will cause an infinite loop.
Of course, this is in some sense a developer error, but it is a pain to constantly add code to clear the camel JMSReplyTo header if it equals the destination. This should probably be internal to the camel-jms component itself.