[jira] [Commented] (LOG4J2-1866) Add default value to MdcPatternConverter

["Gary Gregory (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-1866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981932#comment-15981932 ] 

Gary Gregory commented on LOG4J2-1866:
--------------------------------------

Hi Izek,

Thank you for the patch! 
Would you mind updating it with documentation for the site under {{src/site}}? 

You can view the current docs for this feature here: https://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout

Thank you,
Gary

> Add default value to MdcPatternConverter 
> -----------------------------------------
>
>                 Key: LOG4J2-1866
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1866
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Pattern Converters
>    Affects Versions: 2.8.2
>            Reporter: Izek Greenfield
>              Labels: converter, mdc, pattern
>         Attachments: Add_default_value_to_MDC_converter.patch
>
>
> When using %X in a pattern I can't define default value if the value does not exist in MDC.
> I will be great to be able to define one like:
> {code:title=pattern|borderStyle=solid}
> %X{key}{hello}
> {code}



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