Lucas Brutschy created KAFKA-18917:
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Summary: TransformValues with unnamed Materialized instance throws
NPE
Key: KAFKA-18917
URL: https://issues.apache.org/jira/browse/KAFKA-18917
Project: Kafka
Issue Type: Bug
Affects Versions: 4.0.0
Reporter: Lucas Brutschy
Assignee: Lucas Brutschy
In 4.0, when `transformValues` is used with a `Materialized` instance, but
without a queryable name, a `NullPointerException` is thrown.
{code:java}
.transformValues(new StatelessTransformerSupplier(),
Materialized.with(Serdes.String(), Serdes.Integer())
) {code}
with the following stack trace:
{code:java}
java.lang.NullPointerException: stateStoreFactory can't be null
at java.base/java.util.Objects.requireNonNull(Objects.java:235)
at
org.apache.kafka.streams.processor.internals.InternalTopologyBuilder.addStateStore(InternalTopologyBuilder.java:630)
at
org.apache.kafka.streams.processor.internals.InternalTopologyBuilder.addStateStore(InternalTopologyBuilder.java:619)
at
org.apache.kafka.streams.kstream.internals.graph.ProcessorParameters.addProcessorTo(ProcessorParameters.java:77)
at
org.apache.kafka.streams.kstream.internals.graph.ProcessorToStateConnectorNode.writeToTopology(ProcessorToStateConnectorNode.java:68)
at
org.apache.kafka.streams.kstream.internals.InternalStreamsBuilder.buildAndOptimizeTopology(InternalStreamsBuilder.java:322)
at
org.apache.kafka.streams.StreamsBuilder.build(StreamsBuilder.java:588) {code}
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