Apache log4j is an excellent logging facility to log application information. It is extremely easy to setup and it is very powerful. It comes with an email appender by default which you can config it to sends email when you log.
Example: Logs message to standard system.out on INFO and Sends email when an application error occurs
This is pretty simple. The only setting that controls what to send is the Threshold property of the appender.
Example: Logs message to standard system.out on INFO and Sends email when an application error occurs
# Configuration for receiving e-mails when ERROR messages occur.
log4j.appender.mail=org.apache.log4j.net.SMTPAppender
log4j.appender.mail.To=to@mydomain.com
log4j.appender.mail.From=from@mydomain.com
log4j.appender.mail.SMTPHost=smtp.mydomain.com
log4j.appender.mail.Threshold=ERROR
log4j.appender.mail.BufferSize=1
log4j.appender.mail.Subject=An application error occured
log4j.appender.mail.layout=org.apache.log4j.HTMLLayout
# Standrd System.out appender
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.Threshold=INFO
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.rootLogger=INFO, stdout, mail
This is pretty simple. The only setting that controls what to send is the Threshold property of the appender.
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