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https://issues.apache.org/jira/browse/LOG4J2-587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15829711#comment-15829711
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Mikael Ståldal commented on LOG4J2-587:
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Looks like this symmetric-ds needs to be updated to use Log4j 2.
> log4j-1.2-api emulation jar missing classes
> -------------------------------------------
>
> Key: LOG4J2-587
> URL: https://issues.apache.org/jira/browse/LOG4J2-587
> Project: Log4j 2
> Issue Type: Bug
> Components: log4j 1.2 emulation
> Affects Versions: 2.0-rc1
> Reporter: Adam Gent
> Labels: easyfix
>
> The log4j 1.2 emulation jar does not contain {{AppenderSkeleton}}. There are
> several Spring components like spring-amqp that define custom appenders.
> Even if you don't reference those appenders because of various class loading
> discovery (such as Springs annotation configuration) you will get exceptions
> like
> {code}
> java.lang.NoClassDefFoundError: org/apache/log4j/AppenderSkeleton
> at java.lang.Class.getDeclaredMethods0(Native Method)
> at java.lang.Class.privateGetDeclaredMethods(Class.java:2531)
> at java.lang.Class.getDeclaredMethods(Class.java:1855)
> at
> org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findPersistenceMetadata(
> {code}
> And thus you cannot remove the original log4j-1.2.x jars.
> Basically the class just needs to exist to avoid reflection exceptions like
> the one above. Unfortunately this is a show stopper for us as we use Spring
> heavily and and it appears to happen on any of our spring applications and we
> don't allow jars with duplicate classes in our projets.
> This appears to be an easy fix... just stub all of the log4j-1.2 classes that
> are extendable.
> The log4j SLF4J bridge does in fact contain the appender skeleton:
> http://www.slf4j.org/api/org/apache/log4j/package-summary.html
> Consequently a not so ideal workaround is to just use
> {{log4j-over-slf4j.jar}} which does contain the AppenderSkeleton.
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