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https://issues.apache.org/jira/browse/KAFKA-9533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Roesler reopened KAFKA-9533:
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> ValueTransform forwards `null` values
> -------------------------------------
>
> Key: KAFKA-9533
> URL: https://issues.apache.org/jira/browse/KAFKA-9533
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.0.0, 0.10.2.2, 0.11.0.3, 1.1.1, 2.0.1, 2.2.2,
> 2.4.0, 2.3.1
> Reporter: Michael Viamari
> Assignee: Michael Viamari
> Priority: Major
> Fix For: 2.2.3, 2.5.0, 2.3.2, 2.4.1
>
>
> According to the documentation for `KStream#transformValues`, nulls returned
> from `ValueTransformer#transform` are not forwarded. (see
> [KStream#transformValues|https://kafka.apache.org/24/javadoc/org/apache/kafka/streams/kstream/KStream.html#transformValues-org.apache.kafka.streams.kstream.ValueTransformerSupplier-java.lang.String...-]
> However, this does not appear to be the case. In
> `KStreamTransformValuesProcessor#process` the result of the transform is
> forwarded directly.
> {code:java}
> @Override
> public void process(final K key, final V value) {
> context.forward(key, valueTransformer.transform(key, value));
> }
> {code}
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