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https://issues.apache.org/jira/browse/LOG4J2-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928361#comment-16928361
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Tobias Diez commented on LOG4J2-2690:
-------------------------------------

I tried the master snapshot, but as soon as I add `compile 
'org.apache.logging.log4j:log4j-core:3.0.0-SNAPSHOT'` I get compilation errors 
of the form `error: the unnamed module reads package 
org.apache.logging.log4j.util from both org.apache.logging.log4j.core and 
org.apache.logging.log4j`.
I guess the problem is that `log4j-api` and `log4j-core` both have the package 
`log4j.util`, leading to these split module errors.

> 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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