Construyo este servicio web en netbeans,

package in.figures.on.mobile;

import db.koneksi.dbKoneksi;
import java.sql.Statement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebService;
import org.json.simple.JSONValue;

/**
 *
 * @author Setyadi
 */
@WebService()
public class AksesData {

    /**
     * Web service operation
     */
    @WebMethod(operationName = "Kategori")
    public String Kategori() {
        //TODO write your implementation code here:

        dbKoneksi con = new dbKoneksi();
        Statement statement;
        Properties properties;
        List list = new ArrayList();
        String sql = "SELECT idPrimary_key, kategori FROM kategori ";
        ResultSet hasil;
        String kategori = null;

        try{
            statement = con.getConnection().createStatement();
            hasil = statement.executeQuery(sql);
            while (hasil.next()) {
                properties = new Properties();
                properties.put("idPrimary_key", hasil.getString(1));
                properties.put("kategori", hasil.getString(2));
                list.add(properties);
            }
            kategori = JSONValue.toJSONString(list);
        }
        catch(Exception e){
        }

        return kategori;
    }


}

Y devolver un JSON como este

[{"idPrimary_key":"21ye21","kategori":"FirstCategory"},
{"idPrimary_key":"89oy89","kategori":"SecondCategory"},
{"idPrimary_key":"34ew34","kategori":"ThirdCategory"}]

Y trato de consumir en Android ListView de esta manera, pero aún tengo errores,

        SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);  

        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.setOutputSoapObject(request);

        HttpTransportSE transportSE = new HttpTransportSE(URL);

        try {
            transportSE.call(SOAP_ACTION, envelope);
            SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
            result = response.toString();

        } catch (Exception e) {
            e.printStackTrace();

        }

        String jsonAN = "{\"kat\":"+result+"}"; //try to build to be like this {"kat":[{blablablaJSON}]}
        String kategoriJSONList[][] = new String[99][2];
        String katList[] = new String[99]; //tobe shown on listview, derived from two dimensional array above.
        try {
            jsonObject = new JSONObject(jsonAN);
            jsonArray = jsonObject.getJSONArray("kat");

            for(int i=0; i < jsonArray.length() ; i++){
                kategoriJSONList[i][0] = jsonArray.getJSONObject(i).getString("idPrimary_key").toString();
                kategoriJSONList[i][1] = jsonArray.getJSONObject(i).getString("kategori").toString();
            }

            for(int i=0; i < jsonArray.length(); i++){
                katList[i] = kategoriJSONList[i][1];
            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        ListView list  = (ListView) findViewById(R.id.listKategori);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                WebServiceActivity.this, android.R.layout.simple_list_item_1,katList
                );

        list.setAdapter(adapter);

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                    long arg3) {
                final String kategori = (String) ((TextView)arg1).getText();
                Toast.makeText(WebServiceActivity.this, kategori,
                        Toast.LENGTH_LONG).show();
            }
        });

Necesita ayuda sobre cómo consumir el valor JSON que se devuelve como se muestra arriba para que se muestre como ListView. Tengo estrés en estos días. Gracias por adelantado.