A ConnectionEventListener is an object that registers to receive events generated by a PooledConnection.
The ConnectionEventListener interface is implemented by a connection pooling component. A connection pooling component will usually be provided by a JDBC driver vendor, or another system software vendor. A ConnectionEventListener is notified by a JDBC driver when an application is finished using its Connection object. This event occurs after the application calls close on its representation of the PooledConnection. A ConnectionEventListener is also notified when a Connection error occurs due to the fact that the PooledConnection is unfit for future use---the server has crashed, for example. The listener is notified, by the JDBC driver, just before the driver throws an SQLException to the application using the PooledConnection.