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Thursday January 30, 2003

How To: Configure Log4j to notify you of errors

A couple of weeks ago, I mentioned that I was interested in using Log4j's SMTPAppender to e-mail me messages when errors occured in my webapp. I discovered how easy it is a couple of days ago. Here's how to configure it.

1. Add mail to the log4j.rootCategory in log4j.properties: log4j.rootCategory=INFO, stdout, mail
2. Add the following configuration settings to log4j.properties: 

# Configuration for receiving e-mails when ERROR messages occur.
log4j.appender.mail=org.apache.log4j.net.SMTPAppender
log4j.appender.mail.To=@ERROR-MAILTO@
log4j.appender.mail.From=@ERROR-MAILFROM@
log4j.appender.mail.SMTPHost=@ERROR-MAILHOST@
log4j.appender.mail.Threshold=ERROR
log4j.appender.mail.BufferSize=1
log4j.appender.mail.Subject=CCT Application Error

log4j.appender.mail.layout=org.apache.log4j.PatternLayout
log4j.appender.mail.layout.ConversionPattern=%p [%t] %C{1}.%M(%L) | %m%n

One question I have is that the ConversionPattern is kinda funky - where the line breaks don't seem to be carried into the e-mail (from exception.printStackTrace()). Any suggestions for a better configuration are appreciated. The To, From, and SMTPHost are all replaced with values from Ant during the build process.

Posted in Java at Jan 30 2003, 06:25:43 AM MST 5 Comments
Comments:

I use the following and line breaks are fine: log4j.appender.Mail.layout=org.apache.log4j.PatternLayout log4j.appender.Mail.layout.ConversionPattern=%d %-5p %c %x - %m%n

Posted by Llucifer on January 30, 2003 at 02:25 PM MST #

where log file will be created ? You have not mention in log4j.properties file the location of log file .

Posted by Rajeev Chaturvedi on November 15, 2007 at 05:40 PM MST #

Thanks

Posted by 202.177.174.81 on December 18, 2008 at 04:09 PM MST #

If you also want to change the subject of the emails received, see Log4J SMTPAppender: Exception info in the subject

Posted by Domaniczky Lajos on October 02, 2009 at 09:01 AM MDT #

Try this: log4j.appender.mail.layout=org.apache.log4j.HTMLLayout

Posted by Steve Wells on March 16, 2010 at 02:55 AM MDT #

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