1.
log4j:WARN No appenders could be found for logger 解决方案
【解决】
我们在使用Log4j的时候，总是出现：
- log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
- log4j:WARN Please initialize the log4j system properly.
- log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
- log4j:WARN Please initialize the log4j system properly.
解决方法 : eclipse里，在WEB-INF/classes/路径下加上文件 log4j.properties ；IDEA里，在target/classes/路径下加上文件 log4j.properties 。
其参考内容如下
# Set root logger level to error
log4j.rootLogger=INFO, Console, File
###### Console appender definition #######
# All outputs currently set to be a ConsoleAppender.
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d{ABSOLUTE} %-5p [%c{3}] %m%n
#log4j.appender.Console.layout.ConversionPattern=%d{ABSOLUTE} %-5p [%c] %m%n
###### File appender definition #######
log4j.appender.File=org.apache.log4j.DailyRollingFileAppender
log4j.appender.File.File=spring.log
log4j.appender.File.Append=false
log4j.appender.File.layout=org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern=%d{ABSOLUTE} %-5p [%c] %m%n