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log4j:WARN Please initialize the log4j system properly 解决方案

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使用log4j时候,出现这个警告:
log4j:WARN No appenders could be found for logger (***).
log4j:WARN Please initialize the log4j system properly.

问题原因:没有正确配置log4j配置文件。
log4j默认从系统属性中的log4j.configuration获取log4j配置文件的url,找不到就从classpath中找 log4j.xml文件为配置文件,找不到就从classpath中找log4j.properties配置文件。如果找不到,就打印上面的出错信息。详情见log4j源码,org.apache.log4j.LogManager.java文件。

详情参考本人日志: Log4j笔记 第一章 简单用上Log4j

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