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https://issues.apache.org/jira/browse/LOG4J2-741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15524467#comment-15524467
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Frank Conover commented on LOG4J2-741:
--------------------------------------

I am experiencing this issue with 2.6.3 and I tried 2.3. I have a custom plugin 
in a jar file. Works fine from eclipse, or a non-jar java app but not as a jar 
project. I have packages="... attribute filled out in my log4j2.xml. I added it 
to get the custom appender found while running from eclipse. As a non-maven 
program using jars which are on the classpath the appender is not found.  Is 
there another way I should be doing this? Is packages still fixed / or still an 
available feature?
Note: If I extract my jars and run, the appender is found.

The stack overflow link in the description sounds like my issue. Do I need to 
compile with a certain flag turned on? Generate my jar a certain way?

> Reinstate the package attribute for discovering custom plugins
> --------------------------------------------------------------
>
>                 Key: LOG4J2-741
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-741
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 2.0-rc2, 2.0
>            Reporter: Remko Popma
>            Assignee: Remko Popma
>            Priority: Blocker
>             Fix For: 2.0.1
>
>         Attachments: LOG4J2-741-patch.txt
>
>
> Several people reported problems with their custom plugins no longer being 
> recognized by log4j2. See LOG4J2-673 and [this StackOverflow 
> question|http://stackoverflow.com/questions/24918810/log4j2-configuration-will-not-load-custom-pattern-converter].
> Plugins created before the annotation processor was added to log4j2 (all 
> plugins created with 2.0-rc1 and earlier) may not have a 
> {{META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat}} 
> file.
> Previously plugins without this metadata file could still be found if the 
> user specified their custom plugin package(s) in the {{packages}} attribute 
> of the {{<Configuration>}} element in their log4j2.xml configuration file.
> However, since 2.0-rc2, the {{packages}} configuration attribute was 
> disabled; users may still specify a value, but log4j2 will no longer use this 
> value to try to load custom plugins. This causes problems for custom plugins 
> built before the annotation processor was added to log4j2, as well as custom 
> plugins that are built in an environment where the annotation processor does 
> not work (for example, most IDEs require some setting changes to enable 
> annotation processing).
> This Jira ticket is to reactivate the packages configuration attribute. 



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