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：

1 log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
2 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：

1 log4j.rootLogger=DEBUG, stdout 
2  
3 log4j.appender.stdout=org.apache.log4j.ConsoleAppender 
4 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 
5 log4j.appender.stdout.layout.ConversionPattern=%c{1} - %m%n 
6  
7 log4j.logger.java.sql.PreparedStatement=DEBUG 

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%c[CATEGORY]%n%m[MESSAGE]%n%n
57 # Log Factor 5 Appender
58 log4j.appender.LF5_APPENDER=org.apache.log4j.lf5.LF5Appender
59 log4j.appender.LF5_APPENDER.MaxNumberOfRecords=2000
60 
61 # 发送日志给邮件
62 log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender
63 log4j.appender.MAIL.Threshold=FATAL
64 log4j.appender.MAIL.BufferSize=10
65 log4j.appender.MAIL.From=yyflyons@163.com
66 log4j.appender.MAIL.SMTPHost=www.wusetu.com
67 log4j.appender.MAIL.Subject=Log4J Message
68 log4j.appender.MAIL.To=yyflyons@126.com
69 log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout
70 log4j.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。

1 log4j.rootLogger=CONSOLE,FILE
2 #log4j.rootLogger=DEBUG,CONSOLE,FILE
3 log4j.addivity.org.apache=true