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https://issues.apache.org/jira/browse/KAFKA-3589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-3589.
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Resolution: Fixed
Issue resolved by pull request 1246
[https://github.com/apache/kafka/pull/1246]
> KTable.count(final KeyValueMapper<K, V, K1> selector, String name) throw NPE
> ----------------------------------------------------------------------------
>
> Key: KAFKA-3589
> URL: https://issues.apache.org/jira/browse/KAFKA-3589
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.0.0
> Reporter: Damian Guy
> Assignee: Guozhang Wang
> Labels: architecture
> Fix For: 0.10.0.0
>
>
> The implementation of KTable.count(inal KeyValueMapper<K, V, K1> selector,
> String name) passes null through as the parameters for the key and value
> serdes. This results in an NPE in the aggregate method when it does:
> ChangedSerializer<V1> changedValueSerializer = new
> ChangedSerializer<>(valueSerde.serializer());
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