Philipp Schirmer created KAFKA-14609:
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Summary: Kafka Streams Processor API cannot use state stores
Key: KAFKA-14609
URL: https://issues.apache.org/jira/browse/KAFKA-14609
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 3.3.0
Reporter: Philipp Schirmer
The recently introduced Kafka Streams Processor API (since 3.3,
https://issues.apache.org/jira/browse/KAFKA-13654) likely has a bug with
regards to using state stores. The
[getStateStore|https://javadoc.io/static/org.apache.kafka/kafka-streams/3.3.1/org/apache/kafka/streams/processor/api/ProcessingContext.html#getStateStore-java.lang.String-]
method returns null, even though the store has been registered according to
the docs. The old transformer API still works. I created a small project that
demonstrates the behavior. It uses both methods to register a store for the
transformer, as well as the processor API:
https://github.com/bakdata/kafka-streams-state-store-demo/blob/main/src/test/java/com/bakdata/kafka/StreamsStateStoreTest.java
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