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Posted to dev@kafka.apache.org by "Guozhang Wang (JIRA)" <ji...@apache.org> on 2018/04/20 03:32:00 UTC
[jira] [Resolved] (KAFKA-6592) NullPointerException thrown when
executing ConsoleCosumer with deserializer set to `WindowedDeserializer`
[ https://issues.apache.org/jira/browse/KAFKA-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Guozhang Wang resolved KAFKA-6592.
----------------------------------
Resolution: Fixed
Thanks for the reminder!
> 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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