How to consume a json Rest API with Java using Feign

build.gradle

apply plugin: 'java'

repositories {
    jcenter()
}

dependencies {
    compile 'io.github.openfeign:feign-core:9.2.0'
    compile 'io.github.openfeign:feign-gson:9.2.0'
}

FeignLibrary.java

import feign.Feign;
import feign.Param;
import feign.RequestLine;
import feign.gson.GsonDecoder;

import java.util.List;

class FeignLibrary {

    static class Contributor {
        String login;
        int contributions;
        public String toString() { return login + " (" + contributions + ")"; }
    }

    interface GitHub {
        @RequestLine("GET /repos/{owner}/{repo}/contributors")
        List<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);
    }

    public static void main(String... args) {
        GitHub github = Feign.builder()
                .decoder(new GsonDecoder())
                .target(GitHub.class, "https://api.github.com");

        List<Contributor> contributors = github.contributors("twilio", "twilio-java");
        contributors.stream().forEach(System.out::println);
    }
}