VRaptor3 json personalizado

public class ListJsonWrapper {
   private List<?> list;
   private String msg;
   private double total;

   public ListJsonWrapper(List<?> list; String msg, double total){
      // Passe para os atributos.
   }

   // Não há necessidade de getters e setters.
}

public class Message {
   private String msg;
   private double total;

  // Construtor e essas coisas
}

public class JsonWrapper extends Message {
   private Object obj;

  // Construtor e essas coisas
}

public class Message {  
   private String msg;  
   private double total;  
  
  // Construtor e essas coisas  
}  
  
public class JsonWrapper extends Message {  
   private List<Object> minhaLista;  
  
  // Construtor e essas coisas  
}

public interface DataTables {
	public List<String> toListString(ResourceBundle bundle);
}

public class User implements DataTables {
   // Atributos
	// aqui eu só transformo o que eu quero.
	@Override
	public List<String> toListString(ResourceBundle bundle) {
		List<String> list = new ArrayList<String>();

		list.add(id.toString());
		list.add(name);
		list.add(bundle.getString(status.getLabel()));

		return list;
	}
}
public class DataTablesResult {

	@SuppressWarnings("unused")
	private String sEcho;
	private List<List><String>> aaData = new ArrayList<List><String>>();
	private long iTotalRecords = 0;
	private long iTotalDisplayRecords = 0;

	public DataTablesResult(ResourceBundle bundle, String sEcho,
			List<DataTables> list, long iTotalRecords, long iTotalDisplayRecords) {
		this.sEcho = sEcho;
		this.setAaData(list, bundle);
		this.setiTotalRecords(iTotalRecords);
		this.setiTotalDisplayRecords(iTotalDisplayRecords);
	}

	@Override
	public String toString() {
		return "{'iTotalRecords':" + iTotalRecords
				+ ", 'iTotalDisplayRecords':" + iTotalDisplayRecords
				+ ", 'aaData':" + aaData.toString() + "}";
	}

	@Override
	public boolean equals(Object obj) {
		if (obj == null)
			return false;

		return this.hashCode() == obj.hashCode();
	}

	@Override
	public int hashCode() {
		return this.toString().hashCode();
	}

	private void setAaData(List<DataTables> list, ResourceBundle bundle) {
		if (list == null)
			list = new ArrayList<DataTables>();

		for (DataTables item : list)
			this.aaData.add(item.toListString(bundle));
	}

	private void setiTotalRecords(long iTotalRecords) {
		if (iTotalRecords > 0)
			this.iTotalRecords = iTotalRecords;
	}

	private void setiTotalDisplayRecords(long iTotalDisplayRecords) {
		if (iTotalDisplayRecords > 0)
			this.iTotalDisplayRecords = iTotalDisplayRecords;
	}
}
// Uso dessa forma:
@Get("/data/tables/{strategy}")
	public void list(DataTablesCriteriaBuilder strategy, List<DataTablesFilter> filters, String sEcho,
			int iDisplayStart, int iDisplayLength, List<Sort> sorts) {
		try {
			if (strategy == null)
				throw new IllegalArgumentException(
						"The strategy cannot be null.");

			DataTablesResult dataTablesResult = this.buildResult(strategy,
					filters, sEcho, iDisplayStart, iDisplayLength, sorts);

			this.result.use(Results.json()).withoutRoot()
					.from(dataTablesResult).recursive().serialize();
		} catch (Exception e) {
			this.logger.error("Unable to list this data tables.", e);
			this.result.use(Results.status()).badRequest(
					"Unable to list this data tables.");
		}
	}

	private DataTablesResult buildResult(DataTablesCriteriaBuilder strategy,
			List<DataTablesFilter> filters, String sEcho, int iDisplayStart,
			int iDisplayLength, List<Sort> sorts) {

		long iTotalRecords = dao.count(strategy);
		long iTotalDisplayRecords = dao.count(filters, strategy);
		List<DataTables> list = dao.list(filters, iDisplayStart,
				iDisplayLength, sorts, strategy);

		return new DataTablesResult(bundle, sEcho, list, iTotalRecords,
				iTotalDisplayRecords);
	}

result.use(Results.http()).body(oJson);

public class AtributosExtraJson {

    public int total;

    public String msg;

    public boolean success;
    ...
}

public class JsonReturn<T> extends AtributosExtraJson {

    private List<T> elementos;
    ...

public interface IJsonUtil<T> {

    public String toJson(JsonReturn<T> jsonReturn);

}

import java.lang.reflect.Modifier;
import java.lang.reflect.Type;

import org.joda.time.DateTime;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public class JsonUtilImpl<T> implements IJsonUtil<T> {

    @Override
    public String toJson(JsonReturn<T> jsonReturn) {

        //codigo opcional. Aqui estou definindo para nao serializar atributos com modificadores transiente e para serializar atributos nulos
	GsonBuilder gsonBuilder = new GsonBuilder().excludeFieldsWithModifiers(Modifier.TRANSIENT).serializeNulls();
        //codigo opcional. Aqui estou definindo um conversor para data no formato JodaTime.
	gsonBuilder.registerTypeAdapter(DateTime.class, new ConvertJodaTimeToJson());

         
       // utilizar este codigo se tiver problema com referencia circular. Necessario incluir a classe GraphAdapterBuilder manualmente, ela nao vem o o Gson.
        //new GraphAdapterBuilder().addType(Usuario.class).registerOn(gsonBuilder);

	Gson gson = gsonBuilder.create();
	return gson.toJson(jsonReturn);
    }
     
    // Converter e formatar data no formato JodaTime para json
    private class ConvertJodaTimeToJson implements JsonSerializer<DateTime> {
	@Override
	public JsonElement serialize(DateTime src, Type typeOfSrc, JsonSerializationContext context) {
	    return new JsonPrimitive(src.toString("dd/MM/yy"));
	}
    }
}

JsonReturn<Pessoa> jsonReturn = new JsonReturn<Pessoa>();
	jsonReturn.setElementos(minhaListaDePessoa);
	jsonReturn.setMsg("Carregado com sucesso!.");
	jsonReturn.setSuccess(true);
	jsonReturn.setTotal(10);

	IJsonUtil<Pessoa> jsonUtil = new JsonUtilImpl<Pessoa>();

	response.setHeader("Content-Type", "application/json");
	result.use(Results.http()).body(jsonUtil.toJson(jsonReturn));