You can create a "resource-adapter-config" for "jmsra" [default MQ resource adatper name] as follows :
asadmin create-resource-adapter-config --threadpools jms-thread-pool jmsra
where jms-thread-pool is the one created by user that can be used only for jmsra.
This will ensure that the work (message delivery) is done by a thread obtained from specified thread-pool.
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