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https://issues.apache.org/jira/browse/LOG4J2-798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14110776#comment-14110776
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Ian Barfield commented on LOG4J2-798:
-------------------------------------
Gave the patch a once over. Without comment on the rest of the changes, it does
seem to fix at least the specific issue of the 'Level' category erroneously
triggering core package scans. Naturally, I feel that the solution I created
for codec is superior for issue since it uses an existing, well-documented and
supported standard for controlling overrides etc.
However, as long as I can prevent any package scans and include my
configuration factory via a system property (as a specific class -- not a
package that requires jar scans), then that's all I really need.
> jar scanning for plugins too expensive and called too many times
> ----------------------------------------------------------------
>
> Key: LOG4J2-798
> URL: https://issues.apache.org/jira/browse/LOG4J2-798
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0.1, 2.0.2
> Environment: modern hardware, fat jar
> Reporter: Ian Barfield
>
> related to: [https://issues.apache.org/jira/browse/LOG4J2-741]
> It takes about 3 seconds to perform {{PluginManager.collectPlugins()}} and it
> appears to run 4 times before log4j2 is done initializing. That is pretty not
> okay. Please consider making the plugin discovery method configurable and/or
> curtailing the redundant calls.
> My application jar uses the maven shade plugin. I do not specify a 'packages'
> attribute. I do use a custom plugin (a configuration factory), but I excluded
> the resultant plugin dat file created for it and specify its usage at runtime
> via the appropriate system property.
> My suggestion for the easiest fix is to use the pre-computed plugin list and
> optionally (maybe even enabled by default) also scan the class path for
> custom plugins.
> Some nice extras would be:
> - removing the redundant {{collectPlugins()}} calls
> - using a plugin dat file format that is both human friendly and amenable to
> append operations so that users of the maven shade plugin and users who
> struggle with annotation processors can easily include custom plugins. See
> [https://github.com/addthis/codec] for an example of such a plugin system/
> file format that is based on hocon.
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