I must decide which message queue software (preferably non-commercial) I must use for a distributed app. and JMS seems to be a good choice with JBoss as J2EE server.

I need guaranteed message delivery to the recipient which may be several machines away, eg.

Three machines A,B,C
All three have JBoss running on them.
The queues on A, B and C must act as one queue.
If I publish a message at A then it must arrive at C where there are subscribers for this type of message.
This must happen even though B or C may be switched off at time of publishing. If the message lies and wait at A,B or C and that machine dies (power outage, etc.) then my message must survive the outage.

In short:
Queues on multiple machines act as one queue
Queues sits on top of persistant storage
Queues handles retries in case of network/server outage

Can this be done with JBoss as my J2EE server? If I know that this can be done, I will buy the docs and get going!

Etienne