org.springframework.kafka.annotation

Annotation Type KafkaHandler

@Target(value={METHOD,ANNOTATION_TYPE})
 @Retention(value=RUNTIME)
 @MessageMapping
 @Documented
public @interface KafkaHandler

Annotation that marks a method to be the target of a Kafka message listener within a class that is annotated with KafkaListener.

See the KafkaListener for information about permitted method signatures and available parameters.

It is important to understand that when a message arrives, the method selection depends on the payload type. The type is matched with a single non-annotated parameter, or one that is annotated with @Payload. There must be no ambiguity - the system must be able to select exactly one method based on the payload type.

Author:

Gary Russell

See Also:

EnableKafka, KafkaListener, KafkaListenerAnnotationBeanPostProcessor

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	isDefault When true, designate that this is the default fallback method if the payload type matches no other KafkaHandler method.

Element Detail

isDefault

public abstract boolean isDefault

When true, designate that this is the default fallback method if the payload type matches no other KafkaHandler method. Only one method can be so designated.

Returns:

true if this is the default method.

Since:

2.1.3

Default:

false