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https://issues.apache.org/jira/browse/KAFKA-19330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chia-Ping Tsai resolved KAFKA-19330.
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Fix Version/s: 4.1.0
Resolution: Fixed
> MockSerializer should extend Serializer<String>
> -----------------------------------------------
>
> Key: KAFKA-19330
> URL: https://issues.apache.org/jira/browse/KAFKA-19330
> Project: Kafka
> Issue Type: Improvement
> Reporter: Chia-Ping Tsai
> Assignee: Ming-Yen Chung
> Priority: Minor
> Fix For: 4.1.0
>
>
> MockSerializer and MockProducerInterceptor are used together normally, but
> they are using different types. That causes following error
> ```
> [2025-05-26 03:34:30,919] WARN Error executing interceptor onConsume callback
> (org.apache.kafka.clients.consumer.internals.ConsumerInterceptors:73)
> java.lang.ClassCastException: class [B cannot be cast to class
> java.lang.String ([B and java.lang.String are in module java.base of loader
> 'bootstrap')
> at
> org.apache.kafka.test.MockConsumerInterceptor.onConsume(MockConsumerInterceptor.java:86)
> ~[test/:?]
> ```
> It does not hurt the tests but it is very noising. `MockSerializer` has 20
> usages, and `MockProducerInterceptor` has 47. Hence, we should make
> `MockSerializer` extends Serializer<String>
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