JMS and legacy systems

Hi fellows,
I have to make a decision in my work. We are developing a system, that will be based in application server (JBoss) and it will comunicate with a legacy system throught messages queues. These "queues" are part of proprietary system.
Basically, when business method's EJB are calling, a messege is sent to the legacy system. And the next step is receive a response of that one.
I want use JMS to do that. I have a serie of doubts:
1) May be various EJB sending messages concurrentily. How I know that EJB response message is the right one? How can I make sure that a response message is delivered to the right EJB?
2) I must develop a tier in legacy system to receive JMS messages? I don't want to build a tier that receive a message from a queue, translate that to the legacy system and "vice-versa". I would like that is transparent to avoid work in the legacy system. How can I do that?
Thank in advance.
Forgive my english.
Luciano Bohnert.

1. look up the term correlation ID which is on the Message class, I believe. This ID can be used to match up with your original sender.
The senders must also be listening on another queue. So you need two queue as such.
A->queue1->B->queue2->A
2. MQ Series will support your system needs, but will exist on the Legacy system itself.
You could also use a receiving application which would then send your message via JNI to a C or C++ application on the Legacy system. JNI however is a very confusing many layered mess.

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