Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotF
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引起如下错误的原因是：
dataBase.properties文件中的
Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.jdbc.Driver
这个问题纠结了好长的时间，真蛋疼！
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