log4j 不打印日志

背景说明 

不是web 应用，单独的java程序

报以下错误

log4j:WARN No appenders could be found for logger (xxxx).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

 

 

解决方案

调用 getLogger 之前。先初始化一下log系统 

import org.apache.log4j.xml.DOMConfigurator;

BasicConfigurator.configure();