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https://issues.apache.org/jira/browse/LOG4J2-1535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikael Ståldal updated LOG4J2-1535:
-----------------------------------
    Component/s:     (was: Appenders)
                 Core

> 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: Core
>    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)
>  
> This issue is triggered by the fact that the Kafka client library we use 
> itself does logging via SLF4J during initialization.



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