v4.0.0 was not released and has been skipped. The following is a summary of changes since v3.5.1.

Breaking Changes

• Java: minimum version 17 → 21
• Spring Boot: 3.5.9 → 4.1.0
• Jackson: com.fasterxml.jackson → tools.jackson (3.x namespace migration)
• Springdoc OpenAPI: 2.8.15 → 3.0.3
• Swagger Annotations: swagger-annotations → swagger-annotations-jakarta
• @Nullable: jakarta.annotation.Nullable → org.jspecify.annotations.Nullable
• Spring Cloud: 2025.0.1 → removed
• OpenFeign: removed :febit-boot-feign, :febit-boot-feign-test, :febit-boot-starter-feign submodules
• Devkit: boot-devkit/ migrated to standalone repository (Flyway, jOOQ, Feign Plugin)

Adaptations

• ModelResolver: use JsonMapper.Builder instead of Jackson2ObjectMapperBuilder
• GenericTypeNameResolver: adapt to Springdoc 3.x package path (springdoc.swagger subpackage)
• ExtraEnumMetaPropertyCustomizer: support Jackson 2.x / 3.x and classmate ResolvedType variants
• ResponseResponseBodyAdvice: broaden generic parameter to Object, replace with instanceof checks
• JacksonCustomizer: adapt to Jackson 3.x API
• PaginationArgumentResolver: adapt to new API, fix NPE on empty sort parameter

New Features

• boot-starter-jooq: add org.jooq:jooq-jpa-extensions dependency

Dependencies

• febit-commons 3.4.0 → 4.1.0
• febit-devkit 1.5.0 → 1.6.2
• Gradle 9.2.1 → 9.5.1
• springdoc-openapi-bom replaces dependency set