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https://issues.apache.org/jira/browse/LOG4J2-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16930022#comment-16930022
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Ralph Goers commented on LOG4J2-2690:
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I have updated master and have gotten my test project to run, although my test
doesn't have the log4j plugin in a module separate from the application. If
you compile against log4j 3.0.0 you should modify the plugins to reference the
classes in log4j-plugins instead of log4j-core and you will need to add a
provides org.apache.logging.log4j.plugins.processor.PluginService to
module-info.java. Log4j will generate the class it references.
As for Log4j 2.x, I am sure the issue there is that Log4j can't find the
ClassLoader for the module containing your plugins. We will need to add code to
find all the class loaders for all loaded modules to make that work.
> 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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