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Comments (3)

alfonz19 avatar alfonz19 commented on August 11, 2024 1

Sorry for delay, I had to verify it.
Thank you for your help, you are correct. In our project we have multiple producers and the one producing this specific record was kafka-connect, which was misconfigured. I misread specification, that even custom extensions has to have "ce_" prefix. I thought this rule holds only for cloudevents-specific, known headers. So I fixed kafka-connect configuration and sure enough, everything is fine.

Thanks again for your help!

from sdk-java.

pierDipi avatar pierDipi commented on August 11, 2024

Hi @alfonz19, thanks for reporting, in Kafka, when sending the event, you should see a header ce_whatever having value whatever as opposed to header whatever having value whatever.

This is done by serializer in

sdk-java/kafka/src/main/java/io/cloudevents/kafka/impl/BaseKafkaMessageWriterImpl.java

Lines 41 to 48 in a135755

public BaseKafkaMessageWriterImpl<R> withContextAttribute(String name, String value) throws CloudEventRWException {
String headerName = KafkaHeaders.ATTRIBUTES_TO_HEADERS.get(name);
if (headerName == null) {
headerName = KafkaHeaders.CE_PREFIX + name;
}
headers.add(new RecordHeader(headerName, value.getBytes(StandardCharsets.UTF_8)));
return this;
}
when calling this

sdk-java/kafka/src/main/java/io/cloudevents/kafka/CloudEventSerializer.java

Lines 93 to 95 in a135755

return new KafkaSerializerMessageWriterImpl(headers)
.writeBinary(data);
}

from sdk-java.

pierDipi avatar pierDipi commented on August 11, 2024

how are you writing records to Kafka? Can you share a small reproducer?

from sdk-java.

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