We were running on a SAP PO 7.5 SPS06 system and needed JMS connection pooling to limit the maximum number of connections per queue manager.
Solution: OSS Note 2053223.
Despite several attempts and playing around with parameters mentioned in the OSS note, we had no success and the system always refers to the default connection pool (despite correct parameter usage in the JMS adapter)
The OSS note mentions SP03 for component XI ADAPTER FRAMEWORK 7.50, but we were on SP06. Even that was too low. Now we upgraded the system to SP11 and that fixed the problem. Now, JMS adapter configuration is reflected in the connection pool monitor