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

Bundesamt f�r Informatik und Telekommunikation BIT 
Office f�d�ral de l'informatique et de la t�l�communication OFIT

Ufficio federale dell'informatica e della telecomunicazione UFIT   
Monbijoustrasse 74, CH-3003 Bern

Tel.        ++41 (0)31 325 84  68 
Fax        ++41 (0)31 325 97 54
[EMAIL PROTECTED]
http://www.bit.admin.ch/



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