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From "Guozhang Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6592) NullPointerException thrown when executing ConsoleCosumer with deserializer set to `WindowedDeserializer`
Date Fri, 30 Mar 2018 05:27:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420165#comment-16420165

Guozhang Wang commented on KAFKA-6592:

Yes, the KIP is only for proposing the changes, after the proposal has been accepted, we still
need to implement that. Note the KIP includes two JIRAs, this one and KAFKA-4831. Now that
since the KIP has been accepted, I was thinking you are going to implement the proposed changes
for this ticket :)

> 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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