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https://issues.apache.org/jira/browse/WW-4851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16183174#comment-16183174
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Stefaan Dutry commented on WW-4851:
-----------------------------------
[~lukaszlenart]
After further investigations this is what i found so far:
* jar: {{log4j-api-2.9.0.jar}}
* file in jar causing exception:
{{META-INF/versions/9/org/apache/logging/log4j/util/StackLocator.class}}
* caused by:
** jetty jarscanner
** uses asm libraries.
People's opinions i found so far:
* {{.class}} files under META-INF should not be scanned => bug in jarscanner
My knowledge about this is still limited, but from what i find, it's
{{log4j-api}} that gets reported by the warning, but it's in fact the
jar-scanning that's incorrect and not the jar.
So i don't think we can remove the warning and there is in fact nothing wrong.
It's just because it's a multi-release JAR supporting both java 9 and pre-java 9
> Upgrade to Log4j2 2.9.0
> -----------------------
>
> Key: WW-4851
> URL: https://issues.apache.org/jira/browse/WW-4851
> Project: Struts 2
> Issue Type: Dependency
> Reporter: Stefaan Dutry
> Priority: Trivial
> Fix For: 2.5.14
>
>
> version {{2.9.0}} was released on {{2017-08-26}}
> [changelog|https://logging.apache.org/log4j/2.0/changes-report.html#a2.9.0]
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