ABC.java

package com.bar.grrr;

import java.io.IOException;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;

public class ABC {

    @JsonProperty("class")
    private String clazz;

    public static void main(String[] args) throws IOException {
        String json = "{\n" +
            "    \"class\": \"foo\"\n" +
            "}";
        ObjectMapper objectMapper = new ObjectMapper();
        ABC abc = objectMapper.readValue(json, ABC.class);
        System.out.println("abc.clazz = " + abc.clazz);
    }
}