Summary

• Codec/JsonCodec abstractions — Codec pairs an Encoder + Decoder; JsonCodec narrows to JsonEncoder + JsonDecoder. BaseBuilder.codec() sets both at once
• JsonEncoder marker interface — mirrors the existing JsonDecoder; all JSON encoders (Jackson, Gson, Moshi, Fastjson2, Jackson3) now implement Encoder, JsonEncoder
• Codec implementations — JacksonCodec, GsonCodec, MoshiCodec, Fastjson2Codec, Jackson3Codec (all Codec, JsonCodec), plus JAXBCodec and SOAPCodec (both Codec) for jaxb/jaxb-jakarta/soap/soap-jakarta
• Capability interceptor list enrichment — RequestInterceptors/ResponseInterceptors wrapper types; Capability.enrich(RequestInterceptors) and enrich(ResponseInterceptors) allow capabilities to add/remove interceptors. BaseBuilder.enrich() enriches each interceptor individually, then enriches the list as a whole
• GraphqlCapability — single addCapability() call wires GraphqlContract, GraphqlEncoder, GraphqlDecoder, and GraphqlRequestInterceptor
• GraphqlEncoder/GraphqlRequestInterceptor separation — encoder no longer implements RequestInterceptor

Usage examples

// Codec shortcut
Feign.builder()
    .codec(new JacksonCodec(mapper))
    .target(MyApi.class, url);

// GraphQL with capability
Feign.builder()
    .addCapability(new GraphqlCapability(new JacksonCodec(mapper)))
    .target(GraphqlApi.class, url);

Test plan

• All core tests pass (BaseBuilderTest updated for new interceptor enrichment flow)
• All JSON module tests pass (jackson, gson, moshi, fastjson2, jackson3)
• GraphQL module tests pass (encoder, client integration)
• JAXB and SOAP modules compile and tests pass

🤖 Generated with Claude Code