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https://issues.apache.org/jira/browse/KAFKA-4100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ewen Cheslack-Postava resolved KAFKA-4100.
------------------------------------------
Resolution: Fixed
Issue resolved by pull request 1800
[https://github.com/apache/kafka/pull/1800]
> Connect Struct schemas built using SchemaBuilder with no fields cause NPE in
> Struct constructor
> -----------------------------------------------------------------------------------------------
>
> Key: KAFKA-4100
> URL: https://issues.apache.org/jira/browse/KAFKA-4100
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 0.10.0.1
> Reporter: Shikhar Bhushan
> Assignee: Shikhar Bhushan
> Priority: Minor
> Fix For: 0.10.1.0
>
>
> Avro records can legitimately have 0 fields (though arguable how useful that
> is).
> When using the Confluent Schema Registry's {{AvroConverter}} with such a
> schema,
> {noformat}
> java.lang.NullPointerException
> at org.apache.kafka.connect.data.Struct.<init>(Struct.java:56)
> at io.confluent.connect.avro.AvroData.toConnectData(AvroData.java:980)
> at io.confluent.connect.avro.AvroData.toConnectData(AvroData.java:782)
> at
> io.confluent.connect.avro.AvroConverter.toConnectData(AvroConverter.java:103)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:358)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:227)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:171)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:143)
> at
> org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:140)
> at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:175)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> This is because it is using the {{SchemaBuilder}} to create the Struct
> schema, which provides a {{field(..)}} builder for each field. If there are
> no fields, the list stays as null.
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