com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source

Question

I have MySQL under my Hibernate and I am also using c3p0-0.9.1 for connection pool.

When running on my laptop (I mean locally) I have no errors. But when I deploy it

Answer 1

Was missing a configuration property while setting up the ComboPooledDataSource ; was missing the jdbc driver name; when I set this - was able to get the connection;

Answer 2

Your c3p0-config.xml or c3p0-config.properties is not getting loaded, make sure one of the file should be include in the classpath while deploying in server.

Answer 3

Another problem which may cause this kind of exception is that your JDBC driver doesn't exists in the classpath ...

Answer 4

Some external problems and answers that might help:

• Problem with c3p0
• Problems to connect to mysql with hibernate
• java.sql.SQLException Connections Could not be Acquired from the Underlying Database!

Please follow the links, they all cover problems with the same exception.

Answer 5

Check your database connection. When it is down can happen this exception

Answer 6

Check your JDBC driver version, I've got the same problem. I'm using postgresql, I'd just updated the version in pom.xml and everything worked fine.