Ordering of rollback messages redelivery

Question

I have two transacted message consumers, which are receiving messages repeatedly. If one of the consumer (i.e. ConsumerA) is rollback, would the other consumer (Consumer B) receive the rollback messages?
I found that the method to handle these rollback messages is different across the vendors.
e.g. SwiftMQ, the consumer B will receive the rollback messages, but it may receive the (rollback) message that is older than it's latest messages.
e.g. SonicMQ, the consumer B will not receive the rollback messages, even I have created a new consumer (Consumer C), the messages cannot be received neither, that could cause MESSAGE LOST, if the consumer A doesn't receive message after rollback.
That's really frustrated, does JMS Spec. defined any standard way to handle this senario...?
Thanks a lot
Germen

Answer 1

e.g. SwiftMQ, the consumer B will receive the rollback
messages, but it may receive the (rollback) message
that is older than it's latest messages.That's ok. ;-)
e.g. SonicMQ, the consumer B will not receive the
rollback messages, even I have created a new consumer
(Consumer C), the messages cannot be received neither,
that could cause MESSAGE LOST, if the consumer A
doesn't receive message after rollback.Well, that's bad.
That's really frustrated, does JMS Spec. defined any
standard way to handle this senario...?Nope. The JMS spec doesn't define the behavior of multiple consumers per queue, so this is vendor specific. However, if a JMS product supports multiple consumers, rollbacks shouldn't lead to a message lost but to a re-queue of the message so that other consumers can pick it up.
-- Andreas