Philippe Hong created KAFKA-6728: ------------------------------------ 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. {{}} -- This message was sent by Atlassian JIRA (v7.6.3#76005)