I am facing a weird problem and it seems to be c3p0 related. I am starting two instances of an app in the same java vm which interact with each other. After some operations "APPARENT DEADLOCK" messages appear in the log.
I have the feeling that both app instances use the same connection pool although they use different session factory instances.
Might there be some "singleton-magic" involved in C3P0 ?
As far as I know, there are no singletons involved. Each datasource instance is configured / instantiated / managed separately.
Furthermore, using the same data source from several session factories should not cause any problems (assuming appropriate configuration, adequate number of connections, etc... but that s beside the point here).
Have you tried increasing the number of helper threads and setting maxAdministrativeTaskTime to a non-zero value as described here?
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