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https://issues.apache.org/jira/browse/KAFKA-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14999498#comment-14999498
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ASF GitHub Bot commented on KAFKA-2793:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/482
> ConsoleConsumer crashes with new consumer when using keys because of
> incorrect deserializer
> -------------------------------------------------------------------------------------------
>
> Key: KAFKA-2793
> URL: https://issues.apache.org/jira/browse/KAFKA-2793
> Project: Kafka
> Issue Type: Bug
> Components: tools
> Reporter: Ewen Cheslack-Postava
> Assignee: Ewen Cheslack-Postava
>
> The ConsoleConsumer class uses Array[Byte] everywhere, but the new consumer
> is configured with a string key deserializer, resulting in a class cast
> exception:
> {quote}
> java.lang.ClassCastException: java.lang.String cannot be cast to [B
> at kafka.consumer.NewShinyConsumer.receive(BaseConsumer.scala:62)
> at kafka.tools.ConsoleConsumer$.process(ConsoleConsumer.scala:101)
> at kafka.tools.ConsoleConsumer$.run(ConsoleConsumer.scala:64)
> at kafka.tools.ConsoleConsumer$.main(ConsoleConsumer.scala:42)
> at kafka.tools.ConsoleConsumer.main(ConsoleConsumer.scala)
> {quote}
> Note that this is an issue whether you are printing the keys or not, it will
> be triggered by any non-null key (and I'd imagine some should also trigger
> serialization exceptions if they are not UTF8-decodeable).
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