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https://issues.apache.org/jira/browse/LOG4J2-1152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14946491#comment-14946491
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Christian Möller commented on LOG4J2-1152:
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Thanks for your advise regarding %replace converter - don't know why I have not
got it before. Let me see how I can use it as a base for the code. The %oneLine
converter might have it's own right to exist because it's name is more
expressive than the equivalent %replace{...}{[\r\n]{1,2}}{ |>> }, isn't it?
OK, the name %oneLine might be argueable, but it does not simply remove some
chars but marks/escapes line breaks produced by the enclosed expression.
Your concerns regarding performance: I expect that most of similar converters
get hit by it ... what about IO? OK, I think not really the right place to
discuss it here.
Extending the %throwable converter would catch processing of stack traces only;
applying a more general approach you are able to oneline/mark/escape line
breaks if you are logging program input/output, for example (think of
pretty-printed XML or JSON or the like).
> Add %oneLine to PatternLayout to mask line breaks for easier processing of
> log messages
> ---------------------------------------------------------------------------------------
>
> Key: LOG4J2-1152
> URL: https://issues.apache.org/jira/browse/LOG4J2-1152
> Project: Log4j 2
> Issue Type: New Feature
> Components: Pattern Converters
> Reporter: Christian Möller
> Assignee: Gary Gregory
> Attachments: OneLinePatternConverter.java
>
>
> Adding %oneLine\{...\} to PatternLayout will mask line breaks of enclosed
> Strings as " |>> ". For instance, %oneline{%exception{full}} will convert
> stack traces to a one-liner easier to handle with tools like grep. Based on
> an idea of Heinz Kabutz: http://www.javaspecialists.eu/archive/Issue177.html
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