log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).

一、异常描述：

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

二、错误分析：缺少日志文件。

三、解决方法：在src/main/resources上面右键 New—>File，File name: log4j.properties。

文件内容如下：

 # Configure logging for testing: optionally with log file
 log4j.rootLogger=WARN, stdout
 # log4j.rootLogger=WARN, stdout, logfile

 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

 log4j.appender.logfile=org.apache.log4j.FileAppender
 log4j.appender.logfile.File=target/spring.log
 log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
 log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

完整配置如下：

 log4j.rootLogger=CONSOLE,FILE
 log4j.addivity.org.apache=true

 # 应用于控制台
 log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
 log4j.appender.CONSOLE.Threshold=INFO
 log4j.appender.CONSOLE.Target=System.out
 log4j.appender.CONSOLE.Encoding=GBK
 log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
 log4j.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.DailyRollingFileAppender
 log4j.appender.A1.File=C:/log4j/log
 log4j.appender.A1.Encoding=GBK
 log4j.appender.A1.Threshold=DEBUG
 log4j.appender.A1.DatePattern='.'yyyy-MM-dd
 log4j.appender.A1.layout=org.apache.log4j.PatternLayout
 log4j.appender.A1.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L : %m%n

 #应用于文件
 log4j.appender.FILE=org.apache.log4j.FileAppender
 log4j.appender.FILE.File=C:/log4j/file.log
 log4j.appender.FILE.Append=false
 log4j.appender.FILE.Encoding=GBK
 log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
 log4j.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.RollingFileAppender
 log4j.appender.ROLLING_FILE.Threshold=ERROR
 log4j.appender.ROLLING_FILE.File=rolling.log
 log4j.appender.ROLLING_FILE.Append=true
 log4j.appender.CONSOLE_FILE.Encoding=GBK
 log4j.appender.ROLLING_FILE.MaxFileSize=10KB
 log4j.appender.ROLLING_FILE.MaxBackupIndex=1
 log4j.appender.ROLLING_FILE.layout=org.apache.log4j.PatternLayout
 log4j.appender.ROLLING_FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

 #自定义Appender
 log4j.appender.im = net.cybercorlin.util.logger.appender.IMAppender
 log4j.appender.im.host = mail.cybercorlin.net
 log4j.appender.im.username = username
 log4j.appender.im.password = password
 log4j.appender.im.recipient = yyflyons@163.com
 log4j.appender.im.layout=org.apache.log4j.PatternLayout
 log4j.appender.im.layout.ConversionPattern =[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

 #应用于socket
 log4j.appender.SOCKET=org.apache.log4j.RollingFileAppender
 log4j.appender.SOCKET.RemoteHost=localhost
 log4j.appender.SOCKET.Port=5001
 log4j.appender.SOCKET.LocationInfo=true
 # Set up for Log Facter 5
 log4j.appender.SOCKET.layout=org.apache.log4j.PatternLayout
 log4j.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 Appender
 log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender
 log4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000

 # 发送日志给邮件
 log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender
 log4j.appender.MAIL.Threshold=FATAL
 log4j.appender.MAIL.BufferSize=10
 log4j.appender.MAIL.From=yyflyons@163.com
 log4j.appender.MAIL.SMTPHost=www.wusetu.com
 log4j.appender.MAIL.Subject=Log4J Message
 log4j.appender.MAIL.To=yyflyons@126.com
 log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout
 log4j.appender.MAIL.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n

问题补充：

若加入 log4j.properties 日志文件后，警告信息变成了如下内容：

 2017-10-13 18:22:27,018 WARN [org.hibernate.util.DTDEntityResolver] - recognized obsolete
 hibernate namespace http://hibernate.sourceforge.net/. Use namespace
 http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
 2017-10-13 18:22:27,044 WARN [org.hibernate.util.DTDEntityResolver] - recognized obsolete
 hibernate namespace http://hibernate.sourceforge.net/. Use namespace
 http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
 2017-10-13 18:22:27,651 WARN [org.hibernate.util.DTDEntityResolver] - recognized obsolete
 hibernate namespace http://hibernate.sourceforge.net/. Use namespace
 http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!

针对警告 WARN [org.hibernate.util.DTDEntityResolver] - recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide! 解决方法：

1、检查所有***.hbm.xml文件，看看是不是有
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"
更改为
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"

2、检查hibernate.cfg.xml文件，将
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"
更改为
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"