com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source
Solution 1:
Another problem which may cause this kind of exception is that your JDBC driver doesn't exists in the classpath ...
Solution 2:
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.