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https://issues.apache.org/jira/browse/LOG4J2-2007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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fabrizio giustina updated LOG4J2-2007:
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Summary: Async logger with SMTP appender looses ThreadContext values in
PatternLayout (was: Async logger loose ThreadContext values for header/footer)
> Async logger with SMTP appender looses ThreadContext values in PatternLayout
> ----------------------------------------------------------------------------
>
> Key: LOG4J2-2007
> URL: https://issues.apache.org/jira/browse/LOG4J2-2007
> Project: Log4j 2
> Issue Type: Bug
> Reporter: fabrizio giustina
> Priority: Minor
>
> ThreadContext values seems not handled properly in pattern/header/footer
> properties of PatternLayout when using async logging with a SMTP appender.
> Tested with a SMTP appended with a pattern layout: header is populated
> property in sync mode but it doesn't work anymore when switching to async
> (both using an Async appender than switching to async globally)
> This is a simple appender configuration that shows this behaviour:
> {noformat}
> <SMTP name="sync-mail" to="n...@example.com"
> from="TEST<n...@example.com>" smtpHost="localhost" smtpPort="25"
> ignoreExceptions="false" subject="MDCSUBJECT%X{MDC1} %m">
> <PatternLayout header="%n
> ===================================%n
> MDC1HEADER=%X{MDC1}%n
> ===================================%n" pattern="%-5p %c (%F:%L)
> %d{dd.MM.yyyy HH:mm:ss} %m MDC1=%X{MDC1}%ex%n" />
> </SMTP>
> <Async name="mail-async" includeLocation="true">
> <AppenderRef ref="sync-mail" />
> </Async>
> {noformat}
> a simple:
> {noformat}
> ThreadContext.put("MDC1", "***testmdc***");
> log.error("test message");
> {noformat}
> which goes directly to the sync-mail appender leads to the following result:
> {noformat}
> subject: MDCSUBJECT***testmdc*** test message
> body:
> ===================================
> MDC1HEADER=***testmdc***
> ===================================
> {noformat}
> as you can see the ThreadContext value is replace in both the subject (built
> with the "subject" attribute of the appender) and the body of the email,
> generated using the "header" layout attribute.
> Doing the same though the "mail-async" appender leads instead to the
> following result:
> {noformat}
> subject: MDCSUBJECT***testmdc*** test message
> body:
> ===================================
> MDC1HEADER=
> ===================================
> {noformat}
> As you can see the subject of the email is still handled property (the
> ThreadContext value has been filled although the message has been sent by a
> separate thread) but the body of the email has lost any ThreadContext value.
> I actually couldn't find any way at the moment to preserve ThreadContext
> values in header/footer without keeping the smtp appender synchronous.
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