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https://issues.apache.org/jira/browse/KAFKA-9248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032632#comment-17032632
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John Roesler commented on KAFKA-9248:
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Hey [~mjsax], I just saw this ticket. I think it's the same as
https://issues.apache.org/jira/browse/KAFKA-9517, do you agree?
If so, I'd close this one as a duplicate, since 9517 already has a PR.
> Foreign key join does not pickup default serdes and dies with NPE
> -----------------------------------------------------------------
>
> Key: KAFKA-9248
> URL: https://issues.apache.org/jira/browse/KAFKA-9248
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.4.0
> Reporter: Matthias J. Sax
> Assignee: Matthias J. Sax
> Priority: Major
>
> The foreign key join operator only works if `Serdes` are passed in by the
> user via corresponding API methods.
> If one tries to fall back to default Serdes from `StreamsConfig` the operator
> does not pick up those Serdes but dies with a NPE.
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