[KAFKA-14270] Kafka Streams logs exception on startup

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.4.0
• Component/s: streams
• External issue URL: https://github.com/apache/kafka/pull/12700

Language

groovy

• Assignee: Oliver Eikemeier
• Reporter: Oliver Eikemeier
• Created: 30/Sep/22 09:54
• Updated: 04/Oct/22 10:03
• Resolved: 04/Oct/22 10:00

Description

Kafka Streams expects a version resource at /kafka/kafka-streams-version.properties. It is read by ClientMetrics, initialised by

https://github.com/apache/kafka/blob/3.3.0/streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java#L894

When the resource is not found,

https://github.com/apache/kafka/blob/3.3.0/streams/src/main/java/org/apache/kafka/streams/internals/metrics/ClientMetrics.java#L55

logs a warning at startup:
org.apache.kafka.streams.internals.metrics.ClientMetrics <clinit> WARN: Error while loading kafka-streams-version.properties
java.lang.NullPointerException: inStream parameter is null
at java.base/java.util.Objects.requireNonNull(Objects.java:233)
at java.base/java.util.Properties.load(Properties.java:407)
at org.apache.kafka.streams.internals.metrics.ClientMetrics.<clinit>(ClientMetrics.java:53)
at org.apache.kafka.streams.KafkaStreams.<init>(KafkaStreams.java:894)
at org.apache.kafka.streams.KafkaStreams.<init>(KafkaStreams.java:856)
at org.apache.kafka.streams.KafkaStreams.<init>(KafkaStreams.java:826)
at org.apache.kafka.streams.KafkaStreams.<init>(KafkaStreams.java:738)

Issue Links

• links to: PR #12700