Connections could not be acquired from the underlying database!(Java异常）
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很明显是数据库连接异常，出现这个异常的原因可能有很多。
但这里我只说明我出现该异常的原因：我使用的是远程连接数据库，c3p0配置文件依然用的localhost当然会连接不上，并抛出异常。
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