Hi Ramesh,
I was able to resolve my issues.
As the Sonic guys couln't help, I had to try other ways and ended up
with JMSJCA/sun-jms-adapter.rar. I will blog about this later and send
the link to this mailing list.
I've read that "JMSJCA is to merge with the JMSRA and GenericJMSRA".
So I'm afraid that the new JMSJCA will have the Sonic bug (or whatever
the issue is). Could you please have a look at this, then?
Thanks anyway for your pointers, it did help to understand JMS/JCA
better and finally lead my to this solution.
Best regards,
Matthias