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https://issues.apache.org/jira/browse/LOG4J2-1535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582007#comment-15582007
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Mikael Ståldal commented on LOG4J2-1535:
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So this issue is triggered by the fact that the Kafka client library we use
itself does logging via SLF4J during initialization.
> KafkaAppender NullPointerException when putting the related jars in tomcat lib
> ------------------------------------------------------------------------------
>
> Key: LOG4J2-1535
> URL: https://issues.apache.org/jira/browse/LOG4J2-1535
> Project: Log4j 2
> Issue Type: Improvement
> Components: Appenders
> Affects Versions: 2.6.2
> Environment: Tomcat 7.0.70
> Reporter: Bill Okara
> Attachments: kafka-test-src.tar.gz
>
>
> By putting the log4j2 and kafka appender related jars in tomcat/lib (instead
> of packaged in WEB-INF/lib), got NullPointerException when initializing the
> log4j2.xml.
> Steps to reproduce:
> 1) unzip the attached kafka-test-src.tar.gz, build the project with maven:
> > mvn clean package
> 2) get all the dependency jars by:
> > mvn dependency:copy-dependencies
> 3) copy the *.jar from $project/target/dependency/*.jar to tomcat/lib/
> 4) deploy the war to tomcat
> 5) start tomcat
> Will see errors like:
> Caused by: java.lang.NullPointerException at
> org.apache.kafka.clients.producer.KafkaProducer.close(KafkaProducer.java:658)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:333)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:188)
> at
> org.apache.logging.log4j.core.appender.mom.kafka.DefaultKafkaProducerFactory.newKafkaProducer(DefaultKafkaProducerFactory.java:29)
> at
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaManager.startup(KafkaManager.java:86)
> at
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaAppender.start(KafkaAppender.java:96)
> at
> org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:247)
> at
> org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:496)
> at
> org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:566)
>
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