log4j:WARN No appenders could be found for logger
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在Java编程中有时候会遇到这样的错误：
log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.其实就是IDE找不到log4j的properties文件，因为你还没把它加入到项目的class path。
以IntelliJ Idea为例，在src下新建一个文件夹，然后新建一个文件log4j.properties，往里面写入：
# Set root logger level to DEBUG and its only appender to A1.log4j.rootLogger=DEBUG, A1# A1 is set to be a ConsoleAppender.log4j.appender.A1=org.apache.log4j.ConsoleAppender# A1 uses PatternLayout.log4j.appender.A1.layout=org.apache.log4j.PatternLayoutlog4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n保存，然后点击idea的File -> Project Structure -> Modules，选中刚才创建的resources文件夹，单机上面的Resources，这样就把这个目录下所有的资源文件加载到该项目的class path去啦。
再次运行项目，log正常打印出来了。
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- 解决 WARN No appenders could be found for logger log4j
- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
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- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
- log4j:WARN No appenders could be found for logger
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