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https://issues.apache.org/jira/browse/LOG4J2-2616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849644#comment-16849644
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Gary Gregory commented on LOG4J2-2616:
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[~waldeinburg],
May you please provide a PR on GitHub?
Gary
> Backward compatibility with third party subclasses is broken by added
> constructor argument in ThrowablePatternConverter
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-2616
> URL: https://issues.apache.org/jira/browse/LOG4J2-2616
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.8.2, 2.11.2
> Reporter: Daniel Skovenborg
> Priority: Minor
>
> In 2.8.2 a new argument, config, was [added to the ThrowablePatternConverter
> constructor|https://github.com/apache/logging-log4j2/commit/0146bbae4a94aee9e92e1ba843f0125075debfdc#diff-e4ffc325dbf1d6164a8eb8130f52411eR57]
> without adding a constructor with the original signature specifying a
> default value. This breaks backwards compatibility with third party
> subclasses. If no external subclassing was intended, the constructor should
> have been made package private instead of protected.
> This is not just a theoretical problem. For example, it is annoying when
> using Spring Boot and wanting to use a newer Log4j2 than the default 2.7
> because Spring Boot has its own ExtendedWhitespaceThrowablePatternConverter.
> The system does not crash but the log gets some NoSuchMethodError exceptions.
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