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https://issues.apache.org/jira/browse/LOG4J2-3519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17542846#comment-17542846
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Volkan Yazici commented on LOG4J2-3519:
---------------------------------------
Annotation-processed plugins are recorded into {{Log4j2Plugins.dat}} files. As
Ralph noted, Log4j will find such files in the classpath and load them without
any extra configuration. Though if you are using a fat-JAR for running your
code, you will need the Gradle-equivalent of
[maven-shaded-log4j-transformer|https://github.com/edwgiz/maven-shaded-log4j-transformer].
Please update us on your progress and close the ticket if the problem is
resolved.
> Log4j2 failed to load custom plugin
> ------------------------------------
>
> Key: LOG4J2-3519
> URL: https://issues.apache.org/jira/browse/LOG4J2-3519
> Project: Log4j 2
> Issue Type: Bug
> Components: Plugins
> Affects Versions: 2.17.1
> Reporter: XIAOMING ZHAO
> Priority: Major
>
> We got some issue to load the custom plugin.
> we add annotation Plugin like the following:
> @Plugin(name = "UnifiedLoggingFormat", category = Node.CATEGORY,
> elementType = Layout.ELEMENT_TYPE, printObject = true)
> public class UnifiedLoggingFormat extends AbstractStringLayout
> then add the annotationProcessor in build.gradle
> annotationProcessor( 'org.apache.logging.log4j:log4j-core:2.17.1')
>
> after the build, we can see the
> META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat in
> the class jar file.
> > jar tvf *appender*.jar
> 0 Tue May 24 14:18:40 EDT 2022 META-INF/
> 1077 Tue May 24 14:18:40 EDT 2022 META-INF/MANIFEST.MF
> 0 Tue May 24 14:18:40 EDT 2022 META-INF/org/
> 0 Tue May 24 14:18:40 EDT 2022 META-INF/org/apache/
> 0 Tue May 24 14:18:40 EDT 2022 META-INF/org/apache/logging/
> 0 Tue May 24 14:18:40 EDT 2022 META-INF/org/apache/logging/log4j/
> 0 Tue May 24 14:18:40 EDT 2022 META-INF/org/apache/logging/log4j/core/
> 0 Tue May 24 14:18:40 EDT 2022
> META-INF/org/apache/logging/log4j/core/config/
> 0 Tue May 24 14:18:40 EDT 2022
> META-INF/org/apache/logging/log4j/core/config/plugins/
> 236 Tue May 24 14:18:40 EDT 2022
> META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat
>
> then in log42j.xml, we added the package of this custom plugin class.
> <Configuration status="trace" monitorInterval="30"
> packages="com.server.logging.log4jappenders, com.common.utils">
>
> but we still got the problem
> FelixDispatchQueue DEBUG Took 0.003516 seconds to load 0 plugins from package
> com.server.logging.log4jappenders
> FelixDispatchQueue DEBUG Took 0.000117 seconds to load 0 plugins from package
> com.common.utils
>
> Would you please help out?
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