File for using file systems as a persistent store of messages
JMS when using persistent delivery (the default) for working with JMS queues and topics for high performance, clustering and load balancing
Kafka when using persistent delivery for working with streaming events for high performance, clustering and load balancing
By default, a message is not considered successfully delivered until the recipient has persisted the message locally guaranteeing its receipt in the event the destination becomes unavailable.
And in XML:
<route> <from uri="direct:start"/> <to uri="jms:queue:foo"/> </route>