一、异常描述：
1 log4j:WARN No appenders could be found for logger 2 (org.springframework.web.context.ContextLoader). 3 log4j:WARN Please initialize the log4j system properly. 4 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：
1 # Configure logging for testing: optionally with log file 2 log4j.rootLogger=WARN, stdout 3 # log4j.rootLogger=WARN, stdout, logfile 4 5 log4j.appender.stdout=org.apache.log4j.ConsoleAppender 6 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 7 log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n 8 9 log4j.appender.logfile=org.apache.log4j.FileAppender 10 log4j.appender.logfile.File=target/spring.log 11 log4j.appender.logfile.layout=org.apache.log4j.PatternLayout 12 log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n
完整配置如下：
1 log4j.rootLogger=CONSOLE,FILE 2 log4j.addivity.org.apache=true 3 4 # 应用于控制台 5 log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender 6 log4j.appender.CONSOLE.Threshold=INFO 7 log4j.appender.CONSOLE.Target=System.out 8 log4j.appender.CONSOLE.Encoding=GBK 9 log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout 10 log4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n 11 12 # 每天新建日志 13 log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender 14 log4j.appender.A1.File=C:/log4j/log 15 log4j.appender.A1.Encoding=GBK 16 log4j.appender.A1.Threshold=DEBUG 17 log4j.appender.A1.DatePattern='.'yyyy-MM-dd 18 log4j.appender.A1.layout=org.apache.log4j.PatternLayout 19 log4j.appender.A1.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L : %m%n 20 21 #应用于文件 22 log4j.appender.FILE=org.apache.log4j.FileAppender 23 log4j.appender.FILE.File=C:/log4j/file.log 24 log4j.appender.FILE.Append=false 25 log4j.appender.FILE.Encoding=GBK 26 log4j.appender.FILE.layout=org.apache.log4j.PatternLayout 27 log4j.appender.FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n 28 29 # 应用于文件回滚 30 log4j.appender.ROLLING_FILE=org.apache.log4j.RollingFileAppender 31 log4j.appender.ROLLING_FILE.Threshold=ERROR 32 log4j.appender.ROLLING_FILE.File=rolling.log 33 log4j.appender.ROLLING_FILE.Append=true 34 log4j.appender.CONSOLE_FILE.Encoding=GBK 35 log4j.appender.ROLLING_FILE.MaxFileSize=10KB 36 log4j.appender.ROLLING_FILE.MaxBackupIndex=1 37 log4j.appender.ROLLING_FILE.layout=org.apache.log4j.PatternLayout 38 log4j.appender.ROLLING_FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n 39 40 #自定义Appender 41 log4j.appender.im = net.cybercorlin.util.logger.appender.IMAppender 42 log4j.appender.im.host = mail.cybercorlin.net 43 log4j.appender.im.username = username 44 log4j.appender.im.password = password 45 log4j.appender.im.recipient = yyflyons@163.com 46 log4j.appender.im.layout=org.apache.log4j.PatternLayout 47 log4j.appender.im.layout.ConversionPattern =[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n 48 49 #应用于socket 50 log4j.appender.SOCKET=org.apache.log4j.RollingFileAppender 51 log4j.appender.SOCKET.RemoteHost=localhost 52 log4j.appender.SOCKET.Port=5001 53 log4j.appender.SOCKET.LocationInfo=true 54 # Set up for Log Facter 5 55 log4j.appender.SOCKET.layout=org.apache.log4j.PatternLayout 56 log4j.appender.SOCET.layout.ConversionPattern=[start]%d{DATE}[DATE]%n%p[PRIORITY]%n%x[NDC]%n%t[THREAD]%n% 57 c[CATEGORY]%n%m[MESSAGE]%n%n 58 # Log Factor 5 Appender 59 log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender 60 log4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000 61 62 # 发送日志给邮件 63 log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender 64 log4j.appender.MAIL.Threshold=FATAL 65 log4j.appender.MAIL.BufferSize=10 66 log4j.appender.MAIL.From=yyflyons@163.com 67 log4j.appender.MAIL.SMTPHost=www.wusetu.com 68 log4j.appender.MAIL.Subject=Log4J Message 69 log4j.appender.MAIL.To=yyflyons@126.com 70 log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout 71 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：
1 2017-10-13 18:22:27,018 WARN [org.hibernate.util.DTDEntityResolver] - recognized obsolete 2 hibernate namespace http://hibernate.sourceforge.net/. Use namespace 3 http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide! 4 2017-10-13 18:22:27,044 WARN [org.hibernate.util.DTDEntityResolver] - recognized obsolete 5 hibernate namespace http://hibernate.sourceforge.net/. Use namespace 6 http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide! 7 2017-10-13 18:22:27,651 WARN [org.hibernate.util.DTDEntityResolver] - recognized obsolete 8 hibernate namespace http://hibernate.sourceforge.net/. Use namespace 9 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"