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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6592) NullPointerException thrown when executing ConsoleCosumer with deserializer set to `WindowedDeserializer`
Date Fri, 30 Mar 2018 07:27:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420252#comment-16420252

ASF GitHub Bot commented on KAFKA-6592:

huxihx opened a new pull request #4797: KAFKA-6592: ConsoleConsumer should support WindowedSerdes
URL: https://github.com/apache/kafka/pull/4797
   Have Console consumer support TimeWindowedDeserializer/SessionWindowedDeserializer by adding
new parameters `default.windowed.key.serde.inner` and `default.windowed.value.serde.inner`.
   An example would be like this:
   `... --property value.deserializer=org.apache.kafka.common.serialization.StringDeserializer
--property key.deserializer=org.apache.kafka.streams.kstream.TimeWindowedDeserializer --default.windowed.key.serde.inner
   When key/value.deserializer is not TimeWindowedDeserializer or SessionWindowedDeserializer,
specifying `default.windowed.key.serde.inner` or `default.windowed.value.serde.inner` takes
no effect.
   *More detailed description of your change,
   if necessary. The PR title and PR message become
   the squashed commit message, so use a separate
   comment to ping reviewers.*
   *Summary of testing strategy (including rationale)
   for the feature or bug fix. Unit and/or integration
   tests are expected for any behaviour change and
   system tests should be considered for larger changes.*
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)

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> 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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