gsons

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.1</version>
        </dependency>

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.util.List;

public class Gsons {
    public static Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd").create();
    public static Gson gsonPretty = new GsonBuilder().setPrettyPrinting().create();

    static Gson gsonDate = new GsonBuilder().setDateFormat("yyyy-MM-dd")
            .create();
    static Gson gsonPrettyDate = new GsonBuilder().setDateFormat("yyyy-MM-dd")
            .setPrettyPrinting().create();

    static JsonParser parser = new JsonParser();

    public static String toJson(Object obj, boolean pretty) {
        return pretty ? gsonPretty.toJson(obj) : gson.toJson(obj);
    }

    public static String toJson_OnlyDate(Object obj, boolean pretty) {
        return pretty ? gsonPrettyDate.toJson(obj) : gsonDate.toJson(obj);
    }

    public static Gson getGson() {
        return gson;
    }

    public static JsonParser getParser() {
        return parser;
    }

    /**
     * TypeToken<List<Foo>> list = new TypeToken<List<Foo>>() { };
     * 
     * @param json
     * @param typeToken
     * @return
     */
    public static <T> List<T> fromJson(String json, TypeToken<List<T>> typeToken) {
        Type type = typeToken.getType();

        List<T> ret = gson.fromJson(json, type);

        return ret;
    }

    public static <T> T fromJson(String json, Class<T> classOfT) {
        return gson.fromJson(json, classOfT);
    }

    public static String pretty(String json) {
        if (json == null)
            return null;

        JsonElement jsonElement = parser.parse(json);

        return gsonPretty.toJson(jsonElement);
    }
}