Commits on Jan 2, 2026

1. feat(codec): Add Jackson 3 support module (feign-jackson3) …

   This commit introduces a new module `feign-jackson3` that provides support for Jackson 3.x,
   alongside the existing `feign-jackson` module which continues to support Jackson 2.x.
   
   ## Changes
   
   ### Module Creation
   - Created new `jackson3` module based on `feign-jackson`
   - Added module to parent POM
   
   ### Jackson 3 Migration
   - **Dependency**: Upgraded to Jackson 3.0.2 (`tools.jackson.core:jackson-databind`)
   - **Package changes**: Migrated from `com.fasterxml.jackson.*` to `tools.jackson.*`
     - Exception: `com.fasterxml.jackson.annotation` remains unchanged (as per Jackson 3 spec)
   - **Maven coordinates**: Updated groupId from `com.fasterxml.jackson.core` to `tools.jackson.core`
   
   ### API Changes
   - **Immutable ObjectMapper**: Replaced direct `ObjectMapper` instantiation with `JsonMapper.builder()`
     - All configuration now done via builder pattern
   - **Exception handling**:
     - Jackson 3 uses `JacksonException` (unchecked) instead of `IOException` (checked)
     - Updated catch blocks to handle `JacksonException` and extract `IOException` from cause when needed
   - **Module type**: Changed from `Module` to `JacksonModule`
   
   ### Configuration
   - **Default settings**: Respects Jackson 3 defaults (improved security)
     - `FAIL_ON_TRAILING_TOKENS` enabled by default (new in Jackson 3)
     - Explicitly disabled for `Jackson3IteratorDecoder` only (required for streaming array elements)
   - **Java version**: Minimum Java 17 required (Jackson 3 baseline)
   
   ### Classes
   - `Jackson3Decoder`: Standard JSON decoder for Jackson 3
   - `Jackson3Encoder`: Standard JSON encoder for Jackson 3
   - `Jackson3IteratorDecoder`: Streaming iterator decoder for large JSON arrays
   
   ### Tests
   - Migrated all tests from `feign-jackson`
   - Updated to use Jackson 3 APIs (`tools.jackson.*` packages)
   - Updated method names for Jackson 3 API changes (e.g., `getCurrentName()` → `currentName()`)
   - All tests passing ✅
   
   ## Migration Notes
   
   Users can migrate from `feign-jackson` to `feign-jackson3` by:
   1. Updating dependency to `feign-jackson3`
   2. Changing imports from `feign.jackson.*` to `feign.jackson3.*`
   3. Ensuring Java 17+ is available
   
   Both modules can coexist in the same project if needed.
   
   ## References
   - [Jackson 3 Migration Guide](https://github.com/FasterXML/jackson/blob/main/jackson3/MIGRATING_TO_JACKSON_3.md)
   - [Jackson 3.0 Release Notes](https://github.com/FasterXML/jackson/wiki/Jackson-Release-3.0)

   

   fabienbuss committed Jan 2, 2026
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