Hi, When trying out the log4j2 Kafka appender, it works ok if all the log4j2/kafka-client related jars are packaged in the webapp's WEB-INF/lib, like:
>ls WEB-INF/lib/ jackson-core-2.8.1.jar log4j-core-2.6.2.jar lz4-1.3.0.jar kafka-clients-0.10.0.1.jar log4j-slf4j-impl-2.6.2.jar slf4j-api-1.7.21.jar log4j-api-2.6.2.jar log4j-web-2.6.2.jar snappy-java-1.1.2.6.jar But if the jars are provided in tomcat/lib (for all webapps), and each webapp will have its own log4j2.xml (as in attached war), then when launching the webapp, will encounter: ----- 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) --------- (full stack trace as in attached catalina.out) To reproduce the error, simply: 1) build the attached webapp, and deploy the output to tomcat/webapps 2) move the WEB-INF/lib/*.jar to tomcat/lib (make sure WEB-INF/lib is empty after move) 3) start tomcat Tested with tomcat 7.0.70 Anyone encounter similar problem? or is this a bug? (log4j2 or kafka-client bug?) Thanks, Bill
log4j2-kafka-test.tar.gz
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