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https://issues.apache.org/jira/browse/LOG4J2-1522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15425021#comment-15425021
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Mikael Ståldal commented on LOG4J2-1522:
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Yes, maybe. What's missing is the possibility to add a space before/after a
value if it exists. Like:
{{foo bar baz}} when "bar" have a value but {{foo baz}} when "bar" is empty.
(Used for the context stack.)
Could be a useful generic feature to add to PatternLayout, and if we do then we
would not need TTCCLayout.
> Log4j 1 layouts
> ---------------
>
> Key: LOG4J2-1522
> URL: https://issues.apache.org/jira/browse/LOG4J2-1522
> Project: Log4j 2
> Issue Type: Sub-task
> Components: Layouts
> Reporter: Mikael Ståldal
> Assignee: Mikael Ståldal
> Fix For: 2.7
>
>
> Support all layouts in Log4j 1 to the extent possible an reasonable.
> * PatternLayout and EnhancedPatternLayout are mapped to PatternLayout. We
> provide two new pattern conversions for the Log4j 1 format of NDC and MDC.
> * SimpleLayout is mapped to PatternLayout "%level - %m%n"
> * TTCCLayout is ported (cannot be emulated exactly with PatternLayout)
> * HTMLLayout is mapped to HtmlLayout (will not look exactly the same, but
> close enough)
> * XMLLayout is ported (XmlLayout in Log4j 2 is different and will not work)
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