[jira] [Created] (LOG4J2-2992) PatternParser.parse() ignores nested Patterns when determining if a Throwable should be appended.

[Nate (Jira)]

Nate created LOG4J2-2992:
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             Summary: PatternParser.parse() ignores nested Patterns when 
determining if a Throwable should be appended.
                 Key: LOG4J2-2992
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2992
             Project: Log4j 2
          Issue Type: Bug
          Components: Pattern Converters
    Affects Versions: 2.13.1
            Reporter: Nate


Simplified example:

%replace{%ex{full}}{password}{******}

In this example, PatternParser.parse() only considers the %replace{} converter 
and does not find the %ex inside. In this case, if the PatternLayout doesn't 
declare  alwaysWriteExceptions="false", it will append an 
ThrowablePatternConverter anyway, leading to the exception being logged a 
second time without replace converter processing. It would probably be better 
if the RegexReplacementConverter (and other converters that support nested 
patterns) also implements the handlesThrowable() method in a way that delegates 
this handling to the nested patterns.



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