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https://issues.apache.org/jira/browse/LOG4J2-504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905452#comment-13905452
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Jason Winnebeck commented on LOG4J2-504:
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I see this problem too, I wanted to use MapMessage here so I could get a
parsable log, but I get this: "message":"{"action":"getVersion",
"duration":"0", "result":"success"}"
The problem is in JSONLayout line 188 and 194 the quote is appended whether or
not "jsonSupported" is true. Also, the other comment about MapMessage not
escaping JSON characters is also valid, although fortunately I can ensure that
the values I output will not have these characters in them.
The workaround is to write your own layout... Or in my case for this specific
task I'll probably just have to not use log4j for these messages and output a
separate file because I need the output to be parseable.
> Problems with message field when using MultiformatMessage in JSONLayout
> -----------------------------------------------------------------------
>
> Key: LOG4J2-504
> URL: https://issues.apache.org/jira/browse/LOG4J2-504
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts
> Affects Versions: 2.0-beta9
> Reporter: Michael Friedmann
> Attachments: log4j2Test.tar.gz
>
>
> When using MultiformatMessage (e.g. MapMessage) in the JSONLayout, the
> "message" is properly JSON formatted. However, it is surrounded by quotes,
> rendering the overall JSON invalid. When the quotes are removed, everything
> works fine.
> Additionally, the individual properties of the MapMessage may already contain
> JSON formatted values. These are currently surrounded by quotes as well,
> again rendering the overall JSON invalid. Note that for properties whose
> values are plain strings, however, these need to be JSON escaped.
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