how to configure connection pooling in JPA/Hibernate application (Without Spring)?

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Back in the old days, you had to load the appropriate driver class using Class.forName(org.postgresql.Driver.class) construct. With JDBC 4.0 drivers it's no longer necessary - but you may give it a try.

Alternatively, try starting your application with -Djdbc.drivers=org.postgresql.Driver, it does virtually the same as Class.forName snippet, but doesn't require you to hardcode the driver class. Hope it helps.


From the answer

http://stackoverflow.com/a/10899364/112500

I am able to resolve the problem.

And after apending this line to c3p0-config.xml

<property name="driverClass">org.postgresql.Driver</property>

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