Shikhar Bhushan created KAFKA-4100:
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Summary: 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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