Hi we made some pain full experience on z/OS with OJB and connection management. But we was successful to resolve this problem (put there are a lot more problems).
The solution to this problem was:
z/OS jdbc driver for Websphere 4.x use per default a aggressive connection
management
to protect the db2. So the driver closes connection under your knees if this option is set. So you get some errors like this 'method is not valid
on a closed logical connection.prepareStatement()
SQLSTATE=57015 and SQLCODE=-923'
The solution is to disable the aggressive connection management by removing the bboax.jar file from the class path. :-b
regards
Matthias Roth
Thanks you very much for this information. Federico Spinazzi
P.S: have you tried to use a connection listener ?
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