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https://issues.apache.org/jira/browse/KAFKA-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399675#comment-16399675
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Guozhang Wang commented on KAFKA-6592:
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[~huxi_2b] Are you still working on this JIRA now??
> NullPointerException thrown when executing ConsoleCosumer with deserializer
> set to `WindowedDeserializer`
> ---------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-6592
> URL: https://issues.apache.org/jira/browse/KAFKA-6592
> Project: Kafka
> Issue Type: Bug
> Components: streams, tools
> Affects Versions: 1.0.0
> Reporter: huxihx
> Assignee: huxihx
> Priority: Minor
>
> When reading streams app's output topic with WindowedDeserializer deserilizer
> using kafka-console-consumer.sh, NullPointerException was thrown due to the
> fact that the inner deserializer was not initialized since there is no place
> in ConsoleConsumer to set this class.
> Complete stack trace is shown below:
> {code:java}
> [2018-02-26 14:56:04,736] ERROR Unknown error when running consumer:
> (kafka.tools.ConsoleConsumer$)
> java.lang.NullPointerException
> at
> org.apache.kafka.streams.kstream.internals.WindowedDeserializer.deserialize(WindowedDeserializer.java:89)
> at
> org.apache.kafka.streams.kstream.internals.WindowedDeserializer.deserialize(WindowedDeserializer.java:35)
> at
> kafka.tools.DefaultMessageFormatter.$anonfun$writeTo$2(ConsoleConsumer.scala:544)
> at scala.Option.map(Option.scala:146)
> at kafka.tools.DefaultMessageFormatter.write$1(ConsoleConsumer.scala:545)
> at kafka.tools.DefaultMessageFormatter.writeTo(ConsoleConsumer.scala:560)
> at kafka.tools.ConsoleConsumer$.process(ConsoleConsumer.scala:147)
> at kafka.tools.ConsoleConsumer$.run(ConsoleConsumer.scala:84)
> at kafka.tools.ConsoleConsumer$.main(ConsoleConsumer.scala:54)
> at kafka.tools.ConsoleConsumer.main(ConsoleConsumer.scala)
> {code}
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