Question

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?

Answer 1

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.