Planned lessonMID-028-L05

Spring for Apache Kafka

Lesson 5 of 9
Mid-level

On This Lesson 4 topics

In this lesson
Planned topics
Draft outline details
Practice

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

produce and consume from Spring.

Planned topics

KafkaTemplate sends records; @KafkaListener consumes.
Configure serializers (String, JSON) and the consumer group-id in application.yml.
Set the listener ack mode (default commits after the batch is processed; MANUAL for control).
Use a JSON serializer with a trusted-packages setting, or a schema registry (MID-029).
auto.offset.reset decides where a new group starts (earliest or latest).
Check configuration names against the Spring Boot version before recording.

Draft outline details

Demonstration

java

kafka.send("orders", order.id(), new OrderPlaced(order.id(), order.total()));

@KafkaListener(topics = "orders", groupId = "inventory")
void on(OrderPlaced e) { reserve(e); }

Check your understanding

Which property gives each service its own copy of all events?

Show answer

A distinct group-id.

Practice

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