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well, i don't know about XMLMessageListener#onReceive(), but the jms MessageListener http://docs.oracle.com/javaee/5/api/javax/jms/MessageListener.html states the threading contract specifically in the javadoc:
"Each session must insure that it passes messages serially to the listener. "
If you are using broker specific API's, though, then the behavior is whatever that broker implementation specifies.
jtahlborn: I recall solace is a jms standard implementation therefore the jms doc also applies.