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From "huxihx (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6592) NullPointerException thrown when executing ConsoleCosumer with deserializer set to `WindowedDeserializer`
Date Fri, 30 Mar 2018 01:09:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420029#comment-16420029
] 

huxihx commented on KAFKA-6592:
-------------------------------

[~guozhang] [KIP-265|https://cwiki.apache.org/confluence/display/KAFKA/KIP-265%3A+Make+Windowed+Serde+to+public+APIs]
says:
`And in ConsoleConsumer class, add the new StreamsConfigs names into its options: DEFAULT_WINDOWED_KEY_SERDE_INNER_CLASS
and DEFAULT_WINDOWED_VALUE_SERDE_INNER_CLASS. `

That's why I thought this KIP would cover this jira. However, I did not find those added confis
in `ConsoleConsumer`. Is it as designed? 

> 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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