log4j:WARN No appenders could be found for logger

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log4j:WARN No appenders could be found for logger 
log4j:WARN Please initialize the log4j system properly.

 

如果启动时候报如上警告，有两种办法：

1. 检查log4j.properties or log4j.xml是否被load成功了（加载机制见源码：org.apache.log4j.LogManager.class）； 
2. 检查log4j.properties中有没有定义相应的logger

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