[Bug]: class org.apache.logging.slf4j.SLF4JLoggerContext cannot be cast to class org.apache.logging.log4j.core.LoggerContext (org.apache.logging.slf4j.SLF4JLoggerContext and org.apache.logging.log4j.core.LoggerContext are in unnamed module of loader 'app')

[pavanarya-equifax]

What happened?

Hi I am trying to make use of log4j and I see that Dataflow (Apache beam already includes Slf4j)
So after upgrading from 2.51.0 of Apache Beam, I am facing issues with logs

Dependencies in my pom.xml related to Log4j and Slf4j

<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>2.0.16</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.24.3</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.24.3</version>
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j-impl</artifactId>
            <version>2.24.3</version>
        </dependency>

I am getting following exception

java.lang.ClassCastException: class org.apache.logging.slf4j.SLF4JLoggerContext cannot be cast to class org.apache.logging.log4j.core.LoggerContext (org.apache.logging.slf4j.SLF4JLoggerContext and org.apache.logging.log4j.core.LoggerContext are in unnamed module of loader 'app')

Note: I am seeing this error after an upgrade from Apache Beam 2.51.0 to above versions
Also this is occurring in Dataflow env and not with direct runner

Command I use for pushing code to Dataflow

mvn -s $MAVEN_SETTINGS compile exec:java \
                                            -Dexec.cleanupDaemonThreads=false \
                                            -Dexec.mainClass=${mainClass} \
                                            -Dexec.args=" \
                                                --runner=${apacheBeamRunner} \
                                                --project=${project_id} \
                                                --templateLocation=${templateLocation} \
                                                --tempLocation=${tempLocation} \
                                                --region=${region}"

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

Issue Components

• Component: Python SDK
• Component: Java SDK
• Component: Go SDK
• Component: Typescript SDK
• Component: IO connector
• Component: Beam YAML
• Component: Beam examples
• Component: Beam playground
• Component: Beam katas
• Component: Website
• Component: Infrastructure
• Component: Spark Runner
• Component: Flink Runner
• Component: Samza Runner
• Component: Twister2 Runner
• Component: Hazelcast Jet Runner
• Component: Google Cloud Dataflow Runner

[liferoad]

cc @shunping