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https://issues.apache.org/jira/browse/LOG4J2-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17526024#comment-17526024
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ASF subversion and git services commented on LOG4J2-3427:
---------------------------------------------------------
Commit 262828b193da7c63dd0b45509faaa0fb6e0bf16e in logging-log4j2's branch
refs/heads/dependabot/maven/org.apache.felix-maven-bundle-plugin-5.1.4 from
Piotr P. Karwasz
[ https://gitbox.apache.org/repos/asf?p=logging-log4j2.git;h=262828b193 ]
[LOG4J2-3427] Replace ServiceLoader calls with ServiceLoaderUtil
In an attempt to uniformize the calls to `ServiceLoader` and work around
its limitations, this replaces the `ServiceLoader#load` call sites with
`ServiceLoaderUtil#loadServices`.
`ServiceLoaderUtil` is also modified to return `Stream` instead of a
`List`, hence allowing for a more comfortable filtering and sorting of
the results.
> ServiceLoader usage in a servlet environment
> --------------------------------------------
>
> Key: LOG4J2-3427
> URL: https://issues.apache.org/jira/browse/LOG4J2-3427
> Project: Log4j 2
> Issue Type: Improvement
> Reporter: Piotr Karwasz
> Assignee: Piotr Karwasz
> Priority: Major
> Fix For: 2.17.3
>
>
> It is fair to assume that a servlet container like Tomcat might contain
> multiple copies of Log4j 2.x:
> * a copy of Log4j 2.x can be used as logging provider for the entire server,
> * each web application can contain another copy of Log4j 2.x
> One of the shortcomings of {{ServiceLoader}} is that it detects services in
> both the web application's and server's classloader, but only those in the
> web application are usable: those in the server's classloader can not extend
> the service class contained in the application's classloader.
> A typical usage of {{ServiceLoader}} to find all instances of a certain
> service can therefore end up in a {{{}ServiceConfigurationError{}}}. Those
> are caught in Log4j 2.x, but usually end up in all services (also the viable
> ones) being {*}discarded{*}.
> Hence a tool is necessary to only discard those services, which are contained
> in the server's classloader.
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