今天使用C3P0数据源的时候，一直抛出异常：java.sql.SQLException: Connections could not be acquired from the underlying database!
最后终于找到解决办法：MySQL版本不合适，只需要换一个jar包就可以了
我原来使用的是mysql-connector-java-5.1.6-bin.jar，然后将jar包换成mysql-connector-java-5.1.44-bin.jar。重新运行就可以了！
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