Federico Mariani created CAMEL-25338:
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Summary: camel-spring-boot - document Jackson 2 / Jackson 3 usage
and migration
Key: CAMEL-25338
URL: https://issues.apache.org/jira/browse/CAMEL-25338
Project: Camel
Issue Type: Improvement
Components: camel-spring-boot, documentation
Reporter: Federico Mariani
Since 4.19 Camel Spring Boot runs on Spring Boot 4 (Jackson 3 by default), and
Camel ships two parallel Jackson module families (camel-jackson* /
camel-jackson3*) that register the same data format names, transformers,
configurer and starter beans. There is no Jackson guidance in docs/spring-boot
today.
Add a page covering:
* only one Camel Jackson line per application (both starters ->
BeanDefinitionOverrideException; starters bringing camel-jackson transitively
-> classpath order silently decides the data format, and
camel.dataformat.jackson.* is dropped when Jackson 2 wins)
* Kamelet schema resolution only works with the Jackson 2 modules
* upgrading from 4.18 while staying on Jackson 2 (auto-discover-object-mapper
no longer finds a Spring mapper; spring.jackson2.* prefix)
* moving to Jackson 3: Camel-specific configuration changes (feature prefixes,
modules, auto-discovery caveats, onException), payload changes, keeping the
Jackson 2 format for Camel only
* Jackson versions come from the Spring Boot BOM
All statements were reproduced against Camel Spring Boot 4.22.1 / Spring Boot
4.1.1. Related to CAMEL-22857.
_Claude Code on behalf of Croway_
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