[LOG4J2-2037] Include SLF4J in log4j-bom

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: 2.9.0

Environment

Maven

• Assignee: Unassigned
• Reporter: Arend v. Reinersdorff
• Created: 07/Sep/17 19:59
• Updated: 31/Dec/17 05:12
• Resolved: 31/Dec/17 05:12

Description

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:

    <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>

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 BOM which conveniently specifies many optional Spring Boot dependencies.