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From Ralph Goers <ralph.go...@dslextreme.com>
Subject Re: [log4j 1.x] Batch-sending with SMTPAppender
Date Wed, 16 Nov 2016 14:49:47 GMT
First, I have to say that Log4j 1 reached end-of-life over a year ago. We recommend you upgrade
to Log4j 2.

I don’t know what you mean by “each log message seems to generate its own separate email
message”. The SMTP appender accumulates log events in a buffer until a triggering event
occurs (usually an error event) and then all the buffered events are sent in an email. This
happens each time a triggering event occurs. I see the logic for sendOnClose and expect what
you are doing should work, but I haven’t worked with the Log4j 1 code in years so I can’t
say for sure.


> On Nov 16, 2016, at 7:24 AM, Christopher Schultz <schultz.christopher@gmail.com>
> All,
> Apologies if this has been posted before.. I checked the archives but
> it's hard to search for such terms... lots of stuff comes up.
> I have an SMTPAppender configured and it's working (mostly) as expected.
> The only problem is that each log message seems to generate its own
> separate email message.
> My use-case is a periodic job where I'd like to send any errors to an
> email box. Two configuration settings for the SMTPAppender led me to
> believe that the SMTPAppender might batch emails:
> 1. BufferSize
> 2. SendOnClose
> The javadoc specifically mentions that the BufferSize will affect the
> number of logging events delivered "in this email" which I assumed meant
> "each email message".
> My relevant configuration:
> log4j.appender.CLIENT.bufferSize=500
> log4j.appender.CLIENT.sendOnClose=true
> Usually, we get something like 0 - 12 errors per run of this periodic
> job, so I wouldn't expect to get anywhere near the 500 limit. Ideally,
> all of those log messages would be batched together and sent when the
> logger shuts down. At the end of the program, I do one of these:
>    finally
>    {
>        org.apache.log4j.LogManager.shutdown();
>    }
> That ought to trigger the SendOnClose behavior and flush anything that
> hasn't already been sent.
> Am I missing something in my configuration that is required to send
> these messages in batches? I'd prefer not to write the logs to a
> separate file and then use a secondary process to email that log file to
> the intended recipient.
> Thanks,
> -chris

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