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https://issues.apache.org/jira/browse/LOG4J2-802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Sicker resolved LOG4J2-802.
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Resolution: Not A Problem
> Marker.isInstanceOf may not terminate if parent Markers form a cycle
> --------------------------------------------------------------------
>
> Key: LOG4J2-802
> URL: https://issues.apache.org/jira/browse/LOG4J2-802
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.0.2
> Reporter: Matt Sicker
> Priority: Minor
> Labels: marker
>
> Say I have a marker A which has parents B and C. Say marker B has the parent
> A. Now suppose I'm checking if A is an instance of C. Depending on which
> order we added B and C to A, we may recurse down the B path first which would
> give us A ad infinitum.
> Now the way the API Markers are written shouldn't allow such a scenario to
> happen. However, such a scenario may be possible with user-defined Markers.
> Due to the theoretical nature of this problem, I think this is a rather minor
> issue.
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