C3p0 is not JCA and is unaware of transaction enlistement. It is simply a pooling
library.
To get the behavior you want, you need to use a JBossJCA datasource where we provide the
pooling, transaction enlistment etc.
Have a look at:
http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossJCA
generally and
http://wiki.jboss.org/wiki/Wiki.jsp?page=ConfigDataSources
more specifically.
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