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GH-3954: Add warning about @PostConstruct timing with NewTopic beans #4069

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Sep 3, 2025
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GH-3954: Add warning about @PostConstruct timing with NewTopic beans #4069

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GH-3954: Add warning about @PostConstruct timing with NewTopic beans
Chaedie Aug 30, 2025
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Docs: Improve messaging component guidance based on review feedback
Chaedie Sep 3, 2025
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12 changes: 12 additions & 0 deletions spring-kafka-docs/src/main/antora/modules/ROOT/pages/kafka/sending-messages.adoc
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Expand Up @@ -72,6 +72,18 @@ If the topic is configured to use `LOG_APPEND_TIME`, the user-specified timestam
The `metrics` and `partitionsFor` methods delegate to the same methods on the underlying javadoc:org.apache.kafka.clients.producer.Producer[].
The `execute` method provides direct access to the underlying javadoc:org.apache.kafka.clients.producer.Producer[].

[NOTE]
====
When sending messages from Spring components, avoid using `@PostConstruct` methods if relying on automatic topic creation via `NewTopic` beans.
`@PostConstruct` runs before the application context is fully ready, which may cause `UnknownTopicOrPartitionException` on clean brokers.

Instead, consider these alternatives:

- Use an `ApplicationListener<ContextRefreshedEvent>` to ensure the context is fully refreshed before sending.
- Implement `SmartLifecycle` to start after the `KafkaAdmin` bean has completed its initialization.
- Pre-create topics externally.
====

To use the template, you can configure a producer factory and provide it in the template's constructor.
The following example shows how to do so:

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