CODEWITHSUNDEEP
javasmtplog4jaggregatedigest
Joel Pearson
Joel Pearson

Reputation: 1631

Log4J SMTP digest/aggregate emails?

I have a JBOSS batch application that sometimes sends hundreds on emails in a minute to the same email address with Log4J errors. This causes problems with Gmail, because it says we are sending emails too quickly for that gmail account.

So I was wondering if there was a way to basically create a "digest" or "aggregate" email puts all the error logs in 1 email and sends that every 5 minutes. So that way every 5 minutes we may get a large email, but at least we actually get the email instead of it being delayed for hours and hours by gmail servers rejecting it.

I read this post that suggested something about using an evaluator to do that, but I couldn't see how that is configured in the Log4J xml configuration file. It also seemed like it might not be able to "digest" all the logs into 1 email anyway.

Has anyone done this before? Or know if it's possible?

Upvotes: 2

Views: 3333

Answers (2)

JoseK
JoseK

Reputation: 31371

From (the archived) SMTPAppender Usage page:

set this property

log4j.appender.myMail.evaluatorClass = com.mydomain.example.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.mydomain.example;

import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.TriggeringEventEvaluator;

public class MyEvaluator implements TriggeringEventEvaluator {

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

}

You have to write the evaluator logic within this method.

Upvotes: 4

Thies
Thies

Reputation: 696

I created a free useable solution for log4j2 with an ExtendedSmtpAppender.
(If you still use log4j 1.x, simply replace your log4j-1.x.jar with log4j-1.2-api-2.x.jar - and log4j-core-2.x.jar + log4j-api-2.x.jar of course.)

You get it from Maven Central as de.it-tw:log4j2-extras (This requires Java 7+ and log4j 2.8+).
If you are restricted to Java 6 (and thus log4j 2.3) then use de.it-tw:log4j2-Java6-extras

Additionally, see the GitLab project: https://gitlab.com/thiesw/log4j2-extras (or https://gitlab.com/thiesw/log4j2-Java6-extras)


[OLD text:
If you use log4j2, see answer to other stack overflow issue: https://stackoverflow.com/a/34072704/5074004

Or directly go to my external but publically available solution presented in https://issues.apache.org/jira/browse/LOG4J2-1192
]

Upvotes: 0

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