今天看视频学用C3P0，执行以后就会出现
com.mchange.v2.log.MLog 'com.mchange.v2.log.log4j.Log4jMLog' could not be loaded! com.mchange.v2.log.MLog
com.mchange.v2.log.MLog 'com.mchange.v2.log.log4j.Log4jMLog' could not be loaded! com.mchange.v2.log.MLog
阅读背景：
无法加载com.mchange.v2.log.log4j.Log4jMLog
来源：互联网
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