v4.0.0

2026-05-19jackson-3

Breaking Jackson 3 release for Spring Boot 4 applications.

Highlights

01
Jackson 3 by default
The library now compiles against Jackson 3 tools.jackson.* APIs and aligns JSON helpers with Spring Boot 4.
Read the guide →
02
Java time JsonPath support
Typed JSON payload assertions now serialize Java time fields with the library's Jackson 3 mapper instead of failing on LocalDate, Instant, and related types.
03
Application mapper opt-in
The default mapper is exposed as sharedKafkaTestObjectMapper; set spring.kafka.test.object-mapper-bean-name to explicitly use another Spring Boot tools.jackson.databind.ObjectMapper bean.
04
Spring Boot 4.0.5 baseline
The library compiles and tests against the Spring Boot 4.0.5 BOM so Spring Framework, Spring Kafka, and related Spring components resolve from the 4.0.5-managed stack.

Moved production Jackson usage from Jackson 2 com.fasterxml.jackson.* packages to Jackson 3 tools.jackson.* packages.
Replaced Spring Kafka's Jackson 2 JSON serializer/deserializer usage in built-in DTO publishing and typed reading with the library's Jackson 3 serializer/deserializer.
Upgraded topic-file JSON Schema validation to the Jackson 3-compatible json-schema-validator line.
Raised the compile/test baseline to the Spring Boot 4.0.5 BOM.

Added the uniquely named sharedKafkaTestObjectMapper default bean and spring.kafka.test.object-mapper-bean-name for resolving a custom Jackson 3 ObjectMapper bean from the active Spring test context.

Fixed typed hasJsonPath assertions for payload classes that contain Java time fields.