使用c3p0链接池链接数据库时出现：Connections could not be acquired from the underlying database!
当使用c3p0链接数据库时，配置信息都没有错误，可是出现了以下状况：java 下列信息中有一行是java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database!mysql 也就是链接数据库失败spring D:\sofeware\JDK
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