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https://issues.apache.org/jira/browse/LOG4J2-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902450#comment-14902450
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Vermeulen commented on LOG4J2-1071:
-----------------------------------
I was surprised by this too. I don't see why 0 would not be an appropriate
value for how many prior logs to show. Especially if you know how to get to the
actual log file and you value your mailbox storage, this may be the best option.
I have now set the buffer value to 1 and this still shows me an unrelated log
message. I didn't have this behavior with log4j 1.
> Allow for bufferSize=0 in SMTP appender
> ---------------------------------------
>
> Key: LOG4J2-1071
> URL: https://issues.apache.org/jira/browse/LOG4J2-1071
> Project: Log4j 2
> Issue Type: Improvement
> Components: Appenders
> Affects Versions: 2.3
> Reporter: Benjamin Jaton
> Priority: Minor
>
> From the doc:
> "The number of logging events delivered in this e-mail depend on the value of
> BufferSize option. The SMTPAppender keeps only the last BufferSize logging
> events in its cyclic buffer. This keeps memory requirements at a reasonable
> level while still delivering useful application context. All events in the
> buffer are included in the email. The buffer will contain the most recent
> events of level TRACE to WARN preceding the event that triggered the email."
> https://logging.apache.org/log4j/2.x/manual/appenders.html#SMTPAppender
> The bufferSize is the number of messages preceding the message that triggered
> the event. They might be completely unrelated. One may not want to include
> them in the email at all, so having a bufferSize of 0 makes sense.
> This is however disallowed in the code:
> Caused by: java.lang.IllegalArgumentException: The maxSize argument (0) is
> not a positive integer.
> at
> org.apache.logging.log4j.core.util.CyclicBuffer.<init>(CyclicBuffer.java:41)
> at
> org.apache.logging.log4j.core.net.SmtpManager.<init>(SmtpManager.java:70)
> at
> org.apache.logging.log4j.core.net.SmtpManager$SMTPManagerFactory.createManager(SmtpManager.java:338)
> at
> org.apache.logging.log4j.core.net.SmtpManager$SMTPManagerFactory.createManager(SmtpManager.java:299)
> at
> org.apache.logging.log4j.core.appender.AbstractManager.getManager(AbstractManager.java:71)
> at
> org.apache.logging.log4j.core.net.SmtpManager.getSMTPManager(SmtpManager.java:124)
> at
> org.apache.logging.log4j.core.appender.SmtpAppender.createAppender(SmtpAppender.java:142)
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