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Remove log4j-core dependency from SLF4J bridges
To prepare for the migration between Log4j Core 2 and Log4j Core 3 this PR removes the runtime dependency on `log4j-core` from both `log4j-slf4j-impl` and `log4j-slf4j2-impl`. This explicitly reverts the changes in [LOG4J2-3601](https://issues.apache.org/jira/browse/LOG4J2-3601)
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‎log4j-slf4j-impl/pom.xml‎

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</dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.osgi</groupId>
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<artifactId>org.osgi.core</artifactId>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-api</artifactId>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core</artifactId>
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<scope>runtime</scope>
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<artifactId>log4j-api-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-api-test</artifactId>
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<artifactId>log4j-core</artifactId>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-to-slf4j</artifactId>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-csv</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-params</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.vintage</groupId>
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<artifactId>junit-vintage-engine</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>

‎log4j-slf4j2-impl/pom.xml‎

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</dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.osgi</groupId>
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<artifactId>org.osgi.core</artifactId>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-api</artifactId>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core</artifactId>
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<scope>runtime</scope>
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<artifactId>log4j-api-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-api-test</artifactId>
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<artifactId>log4j-core</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-to-slf4j</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-csv</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-params</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.vintage</groupId>
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<artifactId>junit-vintage-engine</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>

‎src/changelog/.2.x.x/.release-notes.adoc.ftl‎

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This releases contains ...
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=== JMX changes
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=== SLF4J implementations (bridges)
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Starting in version 2.24.0, JMX support is disabled by default and can be re-enabled via the `log4j2.disableJmx=false` system property.
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To prepare for the migration between Log4j Core 2 and Log4j Core 3, the
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xref:components.adoc#log4j-slf4j-impl[`log4j-slf4j-impl`]
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and
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xref:components.adoc#log4j-slf4j-impl[`log4j-slf4j2-impl`]
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bridges between SLF4J and Log4j API, no longer depend on Log4j Core 2.
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Users should specify the logging implementation of their choice explicitly in their dependency manager:
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[tabs]
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====
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Maven::
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+
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We assume you use xref:components.adoc#log4j-bom[`log4j-bom`] for dependency management.
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[source,xml]
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----
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<!-- Bridge from SLF4J 2 to Log4j API -->
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-slf4j2-impl</artifactId>
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<scope>runtime</scope>
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</dependency>
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<!-- Log4j API implementation -->
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core</artifactId>
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<scope>runtime</scope>
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</dependency>
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----
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Gradle::
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We assume you use xref:components.adoc#log4j-bom[`log4j-bom`] for dependency management.
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[source,groovy]
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----
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// Bridge from SLF4J 2 to Log4j API
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runtimeOnly 'org.apache.logging.log4j:log4j-slf4j2-impl'
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// Log4j API implementation
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runtimeOnly 'org.apache.logging.log4j:log4j-core'
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----
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====
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See xref:manual/installation.adoc#impl-core[Installing Log4j Core] for more details.
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<#include "../.changelog.adoc.ftl">

‎src/changelog/.2.x.x/slf4j_impl_remove_log4j_core.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="https://logging.apache.org/xml/ns"
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xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
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type="changed">
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<description format="asciidoc">Removes Log4j Core from the runtime dependencies of `log4j-slf4j-impl` and
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`log4j-slf4j2-impl`
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</description>
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</entry>

‎src/site/antora/modules/ROOT/examples/slf4j.adoc‎

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See xref:manual/installation.adoc#impl-core[Installing Log4j Core]

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