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https://issues.apache.org/jira/browse/LOG4J2-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647875#comment-13647875
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Thomas Golden commented on LOG4J2-236:
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Looking through the source, I see that the variable _ought_ to be substituted,
but that the result of lookups.get("env") on line 101 in Interpolator returns
null. It seems that the other resolvers have not been registered at this point.
> SMTPAppender does not interpolate variables
> -------------------------------------------
>
> Key: LOG4J2-236
> URL: https://issues.apache.org/jira/browse/LOG4J2-236
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0-beta5
> Environment: OS X 10.7 Lion (11.4.2 Darwin Kernel Version 11.4.2: Thu
> Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64)
> Reporter: Thomas Golden
>
> When configuring an SMTP appender as follows, I would expect the smtpHost
> property to be interpolated, and the appropriate environment variable
> substituted:
> <SMTP name="Mailer" subject="Error" to="[email protected]"
> from="[email protected]"
> smtpHost="${env:SMTP_HOST}" smtpPort="25" bufferSize="1"></SMTP>
> Instead, Log4J complains that the host ${env:SMTP_HOST} is unknown.
> The documentation does not state that these variables cannot be interpolated,
> so from reading the manual I would assume this is a bug and not, in fact, by
> design.
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