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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6728) Kafka Connect Header Null Pointer Exception
Date Fri, 30 Mar 2018 18:01:02 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420783#comment-16420783
] 

ASF GitHub Bot commented on KAFKA-6728:
---------------------------------------

tedyu opened a new pull request #4800: KAFKA-6728 Kafka Connect Header Null Pointer Exception
URL: https://github.com/apache/kafka/pull/4800
 
 
   Guard against potential null recordHeader in WorkerSinkTask#convertHeadersFor
   
   ### 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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> Kafka Connect Header Null Pointer Exception
> -------------------------------------------
>
>                 Key: KAFKA-6728
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6728
>             Project: Kafka
>          Issue Type: Bug
>          Components: KafkaConnect
>    Affects Versions: 1.1.0
>         Environment: Linux Mint
>            Reporter: Philippe Hong
>            Priority: Major
>
> I am trying to use the newly released Kafka Connect that supports headers by using the
standalone connector to write to a text file (so in this case I am only using the sink component)
> I am sadly greeted by a NullPointerException :
> {noformat}
> ERROR WorkerSinkTask{id=local-file-sink-0} Task threw an uncaught and unrecoverable exception
(org.apache.kafka.connect.runtime.WorkerTask:172)
> java.lang.NullPointerException
>     at org.apache.kafka.connect.runtime.WorkerSinkTask.convertHeadersFor(WorkerSinkTask.java:501)
>     at org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:469)
>     at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:301)
>     at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:205)
>     at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:173)
>     at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:170)
>     at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:214)
>     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>     at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>     at java.lang.Thread.run(Thread.java:748)
> {noformat}
> I launched zookeeper and kafka 1.1.0 locally and sent a ProducerRecord[String, Array[Byte]]
using a KafkaProducer[String, Array[Byte]] with a header that has a key and value.
> I can read the record with a console consumer as well as using a KafkaConsumer (where
in this case I can see the content of the header of the record I sent previously) so no problem
here.
> I only made two changes to the kafka configuration:
>      - I used the StringConverter for the key and the ByteArrayConverter for the value.

>      - I also changed the topic where the sink would connect to.
> If I forgot something please tell me so as it is the first time I am creating an issue
on Jira.



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