[jira] [Created] (LOG4J2-2037) Include SLF4J in log4j-bom

["Arend v. Reinersdorff (JIRA)" <ji...@apache.org>]

Arend v. Reinersdorff created LOG4J2-2037:
---------------------------------------------

             Summary: Include SLF4J in log4j-bom
                 Key: LOG4J2-2037
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2037
             Project: Log4j 2
          Issue Type: Improvement
    Affects Versions: 2.9.0
         Environment: Maven
            Reporter: Arend v. Reinersdorff


Currently log4j-bom only includes Log4j 2 dependencies. It would be nice log4j-bom would also include an slf4j-api dependency (and maybe other optional dependencies).

Currently when using Log4j 2 as a backend for SLF4J the Maven dependency management would look like this:

{code:xml}
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.25</version> <!-- Must match dependency version of log4j-bom -->
            </dependency>
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-bom</artifactId>
                <version>2.9.0</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
{code}
 
If log4j-bom would specify a dependency for slf4j-api:
* Dependency management entry for slf4j-api would no longer be needed
* Keeping the dependency versions of Log4j 2 and SLF4J in sync would much easier. When the dependency version of log4j-bom is increased, it would automatically set the dependency version of slf4j-api.

As an example see [spring-boot-dependencies | http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.springframework.boot%22%20AND%20a%3A%22spring-boot-dependencies%22] BOM which conveniently specifies many optional Spring Boot dependencies.



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