log4j WARN No appenders could be found for logger

最新推荐文章于 2023-05-09 17:47:58 发布

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最新推荐文章于 2023-05-09 17:47:58 发布

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分类专栏： J2SE 文章标签： log4j class properties exception nested logging

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本文介绍如何解决Log4j在配置SMTP邮件发送时遇到的问题，包括版本不匹配导致的错误、无法发送低于ERROR级别的日志邮件及邮件发送失败等，并提供了解决方案。

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From: http://ylzhj01.javaeye.com/blog/763361

使用时，如果在程序中没有 log4j.properties , 则会出现如标题的warn，程序不能运行。

把这个文件放到src下便可

网络较详细地说明有：

http://blog.youkuaiyun.com/azheng270/archive/2008/03/12/2173430.aspx

http://blog.youkuaiyun.com/hingwu/archive/2007/02/13/1509269.aspx

http://www.cnblogs.com/licheng/archive/2008/09/23/1297185.html

http://haitao.javaeye.com/blog/192491

log4j WARN No such property SMTP Username

是因为版本不对， log4j-1.2.13.jar 用新的 log4j-1.2.16.jar解决问题

出现下面的问题

1。即使是将 log4j.appender.MAIL.Threshold=ERROR 修改为 INFO 级别，也只有在日志输出级别为 ERROR （即代码中调用logger.error("message")方法）时才会发送邮件，不知道是什么原因，反正现在的已经满足了需求，就没在去研究。

可能的解决办法http://www.manning-sandbox.com/thread.jspa?messageID=91270

Java代码

In order to send email logging messages for levels below error, you need to set and create a new EvaluatorClass. To follow the example above, the lo4j.properties file becomes:
# Assign appenders to root logger
log4j.rootLogger=DEBUG, myConsole, myLogFile, myMail
# Console appender
log4j.appender.myConsole=org.apache.log4j.ConsoleAppender
log4j.appender.myConsole.layout=org.apache.log4j.PatternLayout
log4j.appender.myConsole.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
# Rolling file appender
log4j.appender.myLogFile=org.apache.log4j.RollingFileAppender
log4j.appender.myLogFile.File=mylog.log
log4j.appender.myLogFile.MaxFileSize=100KB
log4j.appender.myLogFile.MaxBackupIndex=2
log4j.appender.myLogFile.layout=org.apache.log4j.PatternLayout
log4j.appender.myLogFile.layout.ConversionPattern=%d{MMM d, yyyy hh:mm:ss a}: %p [%t] %m%n
log4j.appender.myLogFile.threshold=WARN
# SMTP appender
log4j.appender.myMail=org.apache.log4j.net.SMTPAppender
log4j.appender.myMail.Threshold=WARN
log4j.appender.myMail.BufferSize=10
log4j.appender.myMail.To=username@agency .gov
log4j.appender.myMail.From=username@agency .gov
log4j.appender.myMail.SMTPHost=smtphost
log4j.appender.myMail.Subject=Log4J Message
log4j.appender.myMail.layout=org.apache.log4j.PatternLayout
log4j.appender.myMail.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
# THIS IS THE NEW LINE TO SET THE EVALUATOR
log4j.appender.myMail.evaluatorClass=com.millersystems.example.spi.MyEvaluator
Now you have to create the evaluator class and implement the org.apache.log4j.spi.TriggeringEventEvaluator interface and place this class in a path where log4j can access it.
//Example TriggeringEventEvaluator impl
package com.millersystems.example.spi;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.TriggeringEventEvaluator;
public class MyEvaluator implements TriggeringEventEvaluator {
public boolean isTriggeringEvent(LoggingEvent event) { return true ; }
}

In order to send email logging messages for levels below error, you need to set and create a new EvaluatorClass. To follow the example above, the lo4j.properties file becomes:
# Assign appenders to root logger
log4j.rootLogger=DEBUG, myConsole, myLogFile, myMail

# Console appender
log4j.appender.myConsole=org.apache.log4j.ConsoleAppender
log4j.appender.myConsole.layout=org.apache.log4j.PatternLayout
log4j.appender.myConsole.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

# Rolling file appender
log4j.appender.myLogFile=org.apache.log4j.RollingFileAppender
log4j.appender.myLogFile.File=mylog.log
log4j.appender.myLogFile.MaxFileSize=100KB
log4j.appender.myLogFile.MaxBackupIndex=2
log4j.appender.myLogFile.layout=org.apache.log4j.PatternLayout
log4j.appender.myLogFile.layout.ConversionPattern=%d{MMM d, yyyy hh:mm:ss a}: %p [%t] %m%n
log4j.appender.myLogFile.threshold=WARN

# SMTP appender
log4j.appender.myMail=org.apache.log4j.net.SMTPAppender
log4j.appender.myMail.Threshold=WARN
log4j.appender.myMail.BufferSize=10
log4j.appender.myMail.To=username@agency.gov
log4j.appender.myMail.From=username@agency.gov
log4j.appender.myMail.SMTPHost=smtphost
log4j.appender.myMail.Subject=Log4J Message
log4j.appender.myMail.layout=org.apache.log4j.PatternLayout
log4j.appender.myMail.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n
# THIS IS THE NEW LINE TO SET THE EVALUATOR
log4j.appender.myMail.evaluatorClass=com.millersystems.example.spi.MyEvaluator


Now you have to create the evaluator class and implement the org.apache.log4j.spi.TriggeringEventEvaluator interface and place this class in a path where log4j can access it.

//Example TriggeringEventEvaluator impl

package com.millersystems.example.spi;

import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.TriggeringEventEvaluator;
public class MyEvaluator implements TriggeringEventEvaluator {

public boolean isTriggeringEvent(LoggingEvent event) { return true; }

}

2。log4j:ERROR Error occured while sending e-mail notification.
javax.mail.SendFailedException: Sending failed;
nested exception is:
class javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS command first. d39sm646911wam.4

解决办法：

http://codelol.com/2009/09/log4j-smtpappender-and-authentication/

Java代码

I was trying to hook up my log4j configuration to my gmail account so that I could be immediately alert for errors. Pretty simple use case … But I started getting errors like:
com.sun.mail.smtp.SMTPSendFailedException: 530 5.7 . 0 Must issue a STARTTLS command first.
and
com.sun.mail.smtp.SMTPSendFailedException: 530 5.7 . 0 Authentication required
I have reason to believe SMTPAppender is borked on anything authentication related because your authentication properties are read after the javax.mail.Session is created. The following is code for an overridden SMTPAppender that takes over the session creation.
view sourceprint?01 . import java.security.Security;
02 . import java.util.Properties;
03 . import javax.mail.PasswordAuthentication;
04 . import javax.mail.Session;
05 . import org.apache.log4j.net.SMTPAppender;
06 .
07 . public class SMTPSSLAppender extends SMTPAppender {
08 .
09 .
public SMTPSSLAppender() {
10 .
Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
11 .
}
12 .
13 .
@Override
14 .
protected Session createSession() {
15 .
Properties properties = new Properties();
16 .
properties.setProperty("mail.transport.protocol" , "smtp" );
17 .
properties.setProperty("mail.host" , getSMTPHost());
18 .
properties.put("mail.smtp.auth" , "true" );
19 .
properties.put("mail.smtp.port" , "465" );
20 .
properties.put("mail.smtp.socketFactory.port" , "465" );
21 .
properties.put("mail.smtp.socketFactory.class" , "javax.net.ssl.SSLSocketFactory" );
22 .
properties.put("mail.smtp.socketFactory.fallback" , "false" );
23 .
properties.setProperty("mail.smtp.quitwait" , "false" );
24 .
25 .
Session session = Session.getDefaultInstance(properties, new javax.mail.Authenticator() {
26 .
protected PasswordAuthentication getPasswordAuthentication()
27 .
{ return new PasswordAuthentication(getSMTPUsername(),getSMTPPassword()); }
28 .
});
29 .
30 .
return session;
31 .
}
32 .}And the log4j.properties would have something like:
view sourceprint?01 .log4j.appender.mail=SMTPSSLAppender
02 .log4j.appender.mail.SMTPHost=smtp.gmail.com
03 .log4j.appender.mail.SMTPUsername=myusername
04 .log4j.appender.mail.SMTPPassword=mypassword
05 .log4j.appender.mail.BufferSize= 1
06 .log4j.appender.mail.Subject=ZOMG some error occured!
07 .log4j.appender.mail.To=my @email .com
08 .log4j.appender.mail.threshold=error
09 .log4j.appender.mail.layout=org.apache.log4j.PatternLayout
10 .log4j.appender.mail.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{ 1 }:%L - %m%nOf course, overriding session creation breaks a lot of things, but it still has the 20 % of functionality that 80 % of folks will use