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https://issues.apache.org/jira/browse/KAFKA-14270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17612165#comment-17612165
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Guozhang Wang commented on KAFKA-14270:
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Thanks for filing the bug [~eikemeier], will take a look.
>From your description, it seems whenever Kafka Streams is started, with
>whatever integration tooling besides groovy, it will always log a warning?
> Kafka Streams logs exception on startup
> ---------------------------------------
>
> Key: KAFKA-14270
> URL: https://issues.apache.org/jira/browse/KAFKA-14270
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 3.3.0
> Reporter: Oliver Eikemeier
> Priority: Minor
>
> 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)
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