com.mchange.v2.resourcepool.ResourcePoolException: Attempted to use a closed or broken resource pool

- acquireRetryAttempts 
Default: 30 
Defines how many times c3p0 will try to acquire a new Connection from the database before giving up. If this value is less than or equal to zero, c3p0 will keep trying to fetch a Connection indefinitely 

- acquireRetryDelay 
Default: 1000 
Milliseconds, time c3p0 will wait between acquire attempts. 

- breakAfterAcquireFailure 
Default: false 
If true, a pooled DataSource will declare itself broken and be permanently closeed if a Connection cannot be obtained from the database after making acquireRetryAttempts to acquire one. If false, failure to obtain a Connection will cause all Threads waiting for the pool to acquire a Connection to throw an Exception, but the DataSource will remain valid, and will attempt to acquire again following a call to getConnection().

参考文档： http://itindex.net/blog/2010/01/27/1264560312821.html