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https://issues.apache.org/jira/browse/LOG4J2-2561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16782854#comment-16782854
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Bruce Wen commented on LOG4J2-2561:
-----------------------------------
_Existing code that compares version numbers by parsing their elements and
comparing them numerically will continue to work._ — this is the best way to
compare versions so far.
> In log4j-core AbstractStringLayout java version detection is not JEP223
> compatible
> ----------------------------------------------------------------------------------
>
> Key: LOG4J2-2561
> URL: https://issues.apache.org/jira/browse/LOG4J2-2561
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.11.2
> Reporter: Ulrich Enslin
> Priority: Major
> Labels: easyfix, pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> The function isPreJava8() will detect java 9 and higher as being pre java 8,
> because the logic does not take JEP223 into account.
>
> The same logic is correct in
> org.apache.logging.log4j.util.Constants#getMajorVersion, so simply modified
> the logic in AbstractStringLayout to work the same in the PR.
>
> This seems like a small change, but it prevents log4j from being JDK 9 and up
> compatible.
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