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https://issues.apache.org/jira/browse/LOG4J2-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16930069#comment-16930069
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Ralph Goers commented on LOG4J2-2690:
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[~mattsicker] We already essentially do that. The problem is it can only find
the ClassLoaders in the parent hierarchy, not siblings. We need to locate all
the modules and add their class loaders to the list being searched.
[~TobiasDiez] Yes, you need to add the provides. The PluginService will be
generated by the annotation processor if you have it enabled and you are
compiling with Log4j 3. For me it gets generated into
target/generated-sources/annotations, but I build with Maven. I have no idea
what Gradle does.
> Custom appenders no longer found with Java 11
> ---------------------------------------------
>
> Key: LOG4J2-2690
> URL: https://issues.apache.org/jira/browse/LOG4J2-2690
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.12.1
> Environment: Java 11.2
> {noformat}
> compile group: 'org.slf4j', name: 'slf4j-api', version: '1.8.0-beta4'
> compile 'org.apache.logging.log4j:log4j-slf4j18-impl:2.12.1'
> compile 'org.apache.logging.log4j:log4j-jcl:2.12.1'
> compile 'org.apache.logging.log4j:log4j-api:2.12.1'
> compile 'org.apache.logging.log4j:log4j-core:2.12.1'{noformat}
> Reporter: Tobias Diez
> Priority: Major
>
> After upgrading to Java 11, the custom appenders are no longer found. The
> following errors are shown when running the app:
> {noformat}
> 2019-09-10 21:44:54,195 main ERROR Error processing element GuiAppender
> ([Appenders: null]): CLASS_NOT_FOUND
> 2019-09-10 21:44:54,240 main ERROR Appenders contains an invalid element or
> attribute "OurApplicationInsightsAppender"
> 2019-09-10 21:44:54,261 main ERROR Unable to locate appender
> "applicationInsightsAppender" for logger config "root"
> 2019-09-10 21:44:54,262 main ERROR Unable to locate appender "GuiLogger" for
> logger config "org.jabref"
> 2019-09-10 21:44:54,262 main ERROR Unable to locate appender "GuiLogger" for
> logger config "org.apache.pdfbox"{noformat}
> The log4j config file can be found here:
> https://github.com/JabRef/jabref/blob/master/src/main/resources/log4j2.xml
> and the appender here:
> https://github.com/JabRef/jabref/blob/master/src/main/java/org/jabref/gui/logging/GuiAppender.java
> (They were working with Java 8, so it shouldn't be a configuration problem.)
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