Philippe Hong created KAFKA-6728:
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Summary: 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
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 with 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 message 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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