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https://issues.apache.org/jira/browse/LOG4J2-1522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15424673#comment-15424673
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Mikael Ståldal commented on LOG4J2-1522:
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Only reaming issue is that the format is slightly different for %x (NDC) and %X
(MDC), see comment in {{Log4j1ConfigurationFactory.java}}. I added support for
the Log4j formats if you use %ndc or %properties instead. Don't want to change
the behaviour of existing conversions in Log4j's 2 PatternLayout.
I think this should be good enough if we document it.
> 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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