The error has most likely nothing to do with the JDBC driver; that's just a message that the web app can't be shut down properly. If you want to avoid it, unregister the driver at shutdown time, possibly through a ServletContextListener.
To learn about the actual problem that prevents the web app from starting up, check the other log files.
Joined: Aug 04, 2011
How to unregister it through servletContextListener?
Joined: Mar 22, 2005
DriverManger.deregisterDriver would do that, but you needn't worry - as the message says, it's been done for you. The actual problem is elsewhere.