[KAFKA-17478] Wrong configuration of metric.reporters lead to NPE in KafkaProducer constructor

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.7.0, 3.8.0, 3.7.1
• Fix Version/s: 4.0.0
• Component/s: clients, producer
• Flags: Patch
• External issue URL: https://github.com/apache/kafka/pull/17086
• Assignee: Fred Rouleau
• Reporter: Fred Rouleau
• Due: 04/Sep/24
• Created: 04/Sep/24 10:23
• Updated: 07/Oct/24 04:09
• Resolved: 10/Sep/24 14:22

Description

if the metric.reporters property contains some invalid class, the KafkaProducer constructor fails with non explicit NPE:

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.util.Optional.ifPresent(java.util.function.Consumer)" because "this.clientTelemetryReporter" is null
    at org.apache.kafka.clients.producer.KafkaProducer.close(KafkaProducer.java:1424)
    at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:472)
    at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:295)
    at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:322)
    at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:307)
    at org.frouleau.kafka.clients.Produce.sendAvroSpecific(Produce.java:89)
    at org.frouleau.kafka.clients.Produce.main(Produce.java:63)

This behavior was introduced by KAFKA-15901 implementing KIP-714.

Issue Links

• links to: GitHub Pull Request #17086