Jackson 3 Codec

This module adds support for encoding and decoding JSON via Jackson 3.

Note: Jackson 3 requires Java 17 or higher.

Add Jackson3Codec to your Feign.Builder like so:

java

GitHub github = Feign.builder()
                     .codec(new Jackson3Codec())
                     .target(GitHub.class, "https://api.github.com");

If you want to customize the JsonMapper that is used, provide it to the Jackson3Codec:

java

JsonMapper mapper = JsonMapper.builder()
        .changeDefaultPropertyInclusion(incl -> incl.withValueInclusion(JsonInclude.Include.NON_NULL))
        .enable(SerializationFeature.INDENT_OUTPUT)
        .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
        .build();

GitHub github = Feign.builder()
                     .codec(new Jackson3Codec(mapper))
                     .target(GitHub.class, "https://api.github.com");

You can also configure the encoder and decoder separately:

java

GitHub github = Feign.builder()
                     .encoder(new Jackson3Encoder())
                     .decoder(new Jackson3Decoder())
                     .target(GitHub.class, "https://api.github.com");

Migration from Jackson 2 to Jackson 3

The main differences are:

Package changes: com.fasterxml.jackson → tools.jackson (except for com.fasterxml.jackson.annotation)
GroupId changes: com.fasterxml.jackson.core → tools.jackson.core
ObjectMapper is immutable and must be configured via JsonMapper.builder()
Java 17 minimum requirement

README

Jackson 3 Codec

Migration from Jackson 2 to Jackson 3