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https://issues.apache.org/jira/browse/LOG4J2-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16930643#comment-16930643
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Ralph Goers commented on LOG4J2-2690:
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Yes and no. The quality of it should be just as good as 2.x, but one of the
goals was to modularize it as much as possible. That work hasn't been
completed. I also can't guarantee we won't change more stuff before it is
released.
> 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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