c3p0连接池的问题

C3P0 Exception:

org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: An SQLException was provoked by the following failure: com.mchange.v2.resourcepool.ResourcePoolException: Attempted to use a closed or broken resource pool

Caused by: 

java.sql.SQLException: An SQLException was provoked by the following failure: com.mchange.v2.resourcepool.ResourcePoolException: Attempted to use a closed or broken resource pool

要调整一下数据库连接池参数：

    30   #尝试30次

    100  #每100ms尝试一次

    false