log4j:WARN No appenders could be found for logger 解决方案

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.

这个问题是因为我们的log4j.properties文件配置不够完整，所以我们给它配置齐了就不会再出现这个问题。 
log4j.properties不完整配置如下：

log4j.rootLogger=DEBUG, stdout  log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%c{1} - %m%n  log4j.logger.java.sql.PreparedStatement=DEBUG 

完整配置如下： 

log4j.rootLogger=CONSOLE,FILElog4j.addivity.org.apache=true# 应用于控制台log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppenderlog4j.appender.CONSOLE.Threshold=INFOlog4j.appender.CONSOLE.Target=System.outlog4j.appender.CONSOLE.Encoding=GBKlog4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayoutlog4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n# 每天新建日志log4j.appender.A1=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.A1.File=C:/log4j/loglog4j.appender.A1.Encoding=GBKlog4j.appender.A1.Threshold=DEBUGlog4j.appender.A1.DatePattern='.'yyyy-MM-ddlog4j.appender.A1.layout=org.apache.log4j.PatternLayoutlog4j.appender.A1.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L : %m%n#应用于文件log4j.appender.FILE=org.apache.log4j.FileAppenderlog4j.appender.FILE.File=C:/log4j/file.loglog4j.appender.FILE.Append=falselog4j.appender.FILE.Encoding=GBKlog4j.appender.FILE.layout=org.apache.log4j.PatternLayoutlog4j.appender.FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n# 应用于文件回滚log4j.appender.ROLLING_FILE=org.apache.log4j.RollingFileAppenderlog4j.appender.ROLLING_FILE.Threshold=ERRORlog4j.appender.ROLLING_FILE.File=rolling.loglog4j.appender.ROLLING_FILE.Append=truelog4j.appender.CONSOLE_FILE.Encoding=GBKlog4j.appender.ROLLING_FILE.MaxFileSize=10KBlog4j.appender.ROLLING_FILE.MaxBackupIndex=1log4j.appender.ROLLING_FILE.layout=org.apache.log4j.PatternLayoutlog4j.appender.ROLLING_FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n#自定义Appenderlog4j.appender.im = net.cybercorlin.util.logger.appender.IMAppenderlog4j.appender.im.host = mail.cybercorlin.netlog4j.appender.im.username = usernamelog4j.appender.im.password = passwordlog4j.appender.im.recipient = [e-mail]=org.apache.log4j.PatternLayoutlog4j.appender.im.layout.ConversionPattern =[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n#应用于socketlog4j.appender.SOCKET=org.apache.log4j.RollingFileAppenderlog4j.appender.SOCKET.RemoteHost=localhostlog4j.appender.SOCKET.Port=5001log4j.appender.SOCKET.LocationInfo=true# Set up for Log Facter 5log4j.appender.SOCKET.layout=org.apache.log4j.PatternLayoutlog4j.appender.SOCET.layout.ConversionPattern=[start]%d{DATE}[DATE]%n%p[PRIORITY]%n%x[NDC]%n%t[THREAD]%n%c[CATEGORY]%n%m[MESSAGE]%n%n# Log Factor 5 Appenderlog4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appenderlog4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000# 发送日志给邮件log4j.appender.MAIL=org.apache.log4j.net.SMTPAppenderlog4j.appender.MAIL.Threshold=FATALlog4j.appender.MAIL.BufferSize=10log4j.appender.MAIL.From=[e-mail]=www.wusetu.comlog4j.appender.MAIL.Subject=Log4J Messagelog4j.appender.MAIL.To=[e-mail]=org.apache.log4j.PatternLayoutlog4j.appender.MAIL.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

再次运行你的程序，你会发现Log4j的警告消失了。不过发现以前的Log4j控制台信息也没有了，其实只要把上面详细配置的log4j.rootLogger=CONSOLE,FILE改为log4j.rootLogger=DEBUG,CONSOLE,FILE，你就发现，控制台信息又回来了。

log4j.rootLogger=CONSOLE,FILE#log4j.rootLogger=DEBUG,CONSOLE,FILElog4j.addivity.org.apache=true