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https://issues.apache.org/jira/browse/LOG4J2-3601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17607371#comment-17607371
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Andy Seaborne commented on LOG4J2-3601:
---------------------------------------
We have the internal (clean separation of api, core and impl) and external
(user expectation of an implementation of slf4j using log4j).
The page [https://logging.apache.org/log4j/2.x/log4j-slf4j2-impl/index.html]
does not mention log4j-core. It does refer to "the log4j jars".
Links from the requirements section on that page go to:
[https://logging.apache.org/log4j/2.x/runtime-dependencies.html]
which gets you to
[https://logging.apache.org/log4j/2.x/log4j-slf4j-impl/dependencies.html#Dependency_Tree]
(there is no slf4j2 link) where log4j-core is a runtime dependency.
So there is a history of users (if they read the documentation :)) having a
single dependency way to use log4j to provide the logging for slf4j.
With scope=runtime, there is the same degree of compile separation from
log4j-core as scope=test.
> log4j-slf4j2: change of dependency scope for log4j-core
> -------------------------------------------------------
>
> Key: LOG4J2-3601
> URL: https://issues.apache.org/jira/browse/LOG4J2-3601
> Project: Log4j 2
> Issue Type: Improvement
> Components: SLF4J Bridge
> Affects Versions: 2.19.0
> Reporter: Andy Seaborne
> Priority: Major
>
> The artifact {{log4j-slf4j-impl}} has a scope=runtime dependency on
> log4j-core. {{log4j-slf4j18-impl}} similarly had scope=runtime.
> The artifact {{log4j-slf4j2-impl}} has a scope=test dependency on log4j-core.
> This changed as part of [commit
> 8f63620875|https://github.com/apache/logging-log4j2/pull/1024/files#diff-d3ba9956a9f81420d0be3d69477a05b505746272d548ab17404aa47f3e5946b0]
> although it seems to be unrelated.
> It makes switching over more of a bump. Previously just depending on
> {{log4j-slf4j-impl}} was enough.
> Please switch back to a scope=runtime dependency for {{log4j-slf4j2-impl}}.
> Example: we (Apache Jena) use slf4j in the main code base, and select log4j
> when it needed for binaries tests so we have multiple places where the
> dependency happens. We can change - but this may be a user experience for
> others as well.
> {noformat}
> [INFO] +- org.apache.logging.log4j:log4j-slf4j-impl:jar:2.18.0:compile
> [INFO] | +- org.apache.logging.log4j:log4j-api:jar:2.18.0:compile
> [INFO] | \- org.apache.logging.log4j:log4j-core:jar:2.18.0:runtime
> {noformat}
> {noformat}
> [INFO] +- org.apache.logging.log4j:log4j-slf4j2-impl:jar:2.19.0:compile
> [INFO] | \- org.apache.logging.log4j:log4j-api:jar:2.19.0:compile
> {noformat}
>
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