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https://issues.apache.org/jira/browse/LOG4J2-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16092987#comment-16092987
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Martin Schröder commented on LOG4J2-1421:
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I'm running into the same issue with the prometheus-client (latest source is
[here|https://github.com/prometheus/client_java/blob/master/simpleclient_log4j2/src/main/java/io/prometheus/client/log4j2/InstrumentedAppender.java]):
It loads in IntelliJ but not in a Spring Boot fat jar. The plugin is annotated
with
{code:java}
@Plugin(name = "Prometheus", category = "Core", elementType = "appender")
{code}
A similar ticket: LOG4J2-673
> Custom plugins packaged in jar files are not loaded by "packages" property
> mecanism
> -----------------------------------------------------------------------------------
>
> Key: LOG4J2-1421
> URL: https://issues.apache.org/jira/browse/LOG4J2-1421
> Project: Log4j 2
> Issue Type: Bug
> Components: Plugins
> Affects Versions: 2.6
> Reporter: Anthony Maire
> Attachments: log4j-plugin-load-issue.zip
>
>
> the "packages" attribute in configuration file works properly to load custom
> plugins from Eclipse. However, if the plugin class is packaged alone in a jar
> file (without the Log4j2Plugins.dat file in it), the "packages" property load
> mecanism is not working.
> 2016-06-09 19:40:44,823 main DEBUG Took 0,001222 seconds to load 0 plugins
> from package test
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