How does message persistence affect the order of message production by a client and delivery by the JMS server?
Created May 4, 2012
Jerry Smith
Message priority is another related factor. In general, messages with higher priority will arrive before messages of lower priority, within a session, but it is not possible to depend on high-priority nonpersistent messages being delivered before low-priority persistent messages.
It's convenient to view persistent and nonpersistent messages from the same producing client as elements of a partitioned space, even if sent to the same destination. There is no guarantee that a consuming client will even receive a nonpersistent message; hence, nonpersistent messages must be exempt from any logical conditions on message order in the producing client.
A related issue is that, at best, messages are only ordered within each message-producing session by destination.