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https://issues.apache.org/jira/browse/LOG4J2-2703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034450#comment-17034450
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Volkan Yazici commented on LOG4J2-2703:
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I guess the main problem emanates from the fact that {{MapMessage#data}} is of
type {{StringMap}}, while {{with(key,val)}} methods allow non-String entries in
the values.
> MapMessage#getFormattedMessage() incorrectly formats Object's
> -------------------------------------------------------------
>
> Key: LOG4J2-2703
> URL: https://issues.apache.org/jira/browse/LOG4J2-2703
> Project: Log4j 2
> Issue Type: Bug
> Reporter: Volkan Yazici
> Priority: Minor
>
> The following code snippet
> {color:#0747a6}{{new MapMessage()}}
> {{ .with("key1", "val1")}}
> {{ .with("key2", Collections.singletonMap("val2.1", "val2.2"))}}
> {{ .getFormattedMessage(new String[]\{"JSON"});}}{color}
> produces
> {color:#0747a6}{{{"key1":"val1", "key2":"{val2.1=val2.2}"}}}{color}
> whereas
> {color:#0747a6}{{{"key1":"val1", "key2":{"val2.1":"val2.2}"}}}{color}
> was expected.
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