Tema Client

package com.mx.ipn.escom.clientRest.client;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;

import android.util.Log;

import com.mx.ipn.escom.clientRest.modelo.Tema;


public class TemaClient{

    public List<Tema> getTemas(){

        HttpClient httpClient = new DefaultHttpClient();

        HttpGet getData = new HttpGet("http://192.168.1.64:8080/TesterRest/rest/temas");
        getData.setHeader("content-type", "application/json");
        List<Tema> temas = new ArrayList<Tema>();
        try{
            HttpResponse resp= httpClient.execute(getData);
            String respStr = EntityUtils.toString(resp.getEntity());
            JSONArray data = new JSONArray(respStr);//I have the error here
            for(int i=0; i<data.length();i++){
                JSONObject obj = data.getJSONObject(i);
                Integer id = obj.getInt("idTema");
                String nbName = obj.getString("nbTema");
                String dsName = obj.getString("dsTema");
                Tema tema = new Tema(id, nbName, dsName);
                temas.add(tema);
            }
        }catch (Exception e) {
            // TODO: handle exception
            Log.e("Servicio Rest", "Error!", e);
        }
        for(Tema tema : temas)
            System.out.println(tema.getIdTema() + " " + tema.getNbTema() + " " + tema.getDsTema());
        return temas;
    }

}