今天使用C3P0數據源的時候，一直拋出異常：java.sql.SQLException: Connections could not be acquired from the underlying database!
最后終於找到解決辦法：MySQL版本不合適，只需要換一個jar包就可以了
我原來使用的是mysql-connector-java-5.1.6-bin.jar，然后將jar包換成mysql-connector-java-5.1.44-bin.jar。重新運行就可以了！
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