The Camel RabbitMQ endpoint does not allow to set an empty routing key when configuring a dead letter exchange:
[error] <0.664.0> Channel error on connection <0.649.0> (192.168.224.3:55000 -> 192.168.224.2:5672, vhost: '/', user: 'rabbitmq'), channel 1:
operation queue.declare caused a channel exception precondition_failed: inequivalent arg 'x-dead-letter-routing-key' for queue 'testqueue' in vhost '/': received the value 'undefined' of type 'void' but current is none
This is required if you want to keep the original routing key on the message when it is sent to the dead letter queue.
When setting the deadLetterRoutingKey property to an empty value, the error doesn't appear but the original routing is lost.