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GH-3880: The DefaultHandler resolves an incorrect value for the parameter annotated with @Header. #3881

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May 8, 2025
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GH-3880: The DefaultHandler resolves an incorrect value for the parameter annotated with @Header. #3881

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22 changes: 22 additions & 0 deletions ...tora/modules/ROOT/pages/kafka/receiving-messages/class-level-kafkalistener.adoc
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Expand Up @@ -62,3 +62,25 @@ void listen(Object in, @Header(KafkaHeaders.RECORD_METADATA) ConsumerRecordMetad
...
}
----

Also, this won't work as well.
The `topic` is resolved to the `payload`.

[source, java]
----
@KafkaHandler(isDefault = true)
public void listenDefault(String payload, @Header(KafkaHeaders.RECEIVED_TOPIC) String topic) {
// payload.equals(topic) is True.
...
}
----

If there are use cases in which discrete custom headers are required in a default method, use this:
[source, java]
----
@KafkaHandler(isDefault = true)
void listenDefault(String payload, @Headers Map<String, Object> headers) {
Object myValue = headers.get("MyCustomHeader");
...
}
----