[EDIT] v0.1

src/java/demojsoncrud/beans/PersonaBean.java

@@ -2,12 +2,10 @@ package demojsoncrud.beans;
 
 import java.io.Serializable;
 
-/**
- *
- * @author Alonso
- */
 public class PersonaBean implements Serializable {
 
+  private static final long serialVersionUID = 4594333294248399680L;
+
   private String codigo;
   private String dni;
   private String apellidos;

src/java/demojsoncrud/beans/UbigeoBean.java

@@ -4,6 +4,8 @@ import java.io.Serializable;
 
 public class UbigeoBean implements Serializable {
 
+  private static final long serialVersionUID = 4594333294248399680L;
+
   private String codigoDepartamento;
   private String nombreDepartamento;
   private String codigoProvincia;
@@ -11,6 +13,9 @@ public class UbigeoBean implements Serializable {
   private String codigoDistrito;
   private String nombreDistrito;
 
+  public UbigeoBean() {
+  }
+
   public String getCodigoDepartamento() {
     return codigoDepartamento;
   }

src/java/demojsoncrud/dao/DAOFactory.java

-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package demojsoncrud.dao;
 
 import demojsoncrud.sqlserverdao.SqlserverDAOFactory;
 
-/**
- *
- * @author Alonso
- */
 public abstract class DAOFactory {
 
   public static final int SQL_SERVER = 1;

src/java/demojsoncrud/dao/PersonaDAO.java

 package demojsoncrud.dao;
 
-import demojsoncrud.beans.PersonaBean;
 import org.json.JSONObject;
 
 public interface PersonaDAO {
 
-    public JSONObject listarPersona(String search, String draw, String start, String length);
+    public JSONObject listarPersona(JSONObject datos);
 
     public JSONObject registrarPersona(JSONObject datos);
 

src/java/demojsoncrud/dao/UbigeoDAO.java

-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package demojsoncrud.dao;
 
-import demojsoncrud.beans.UbigeoBean;
 import org.json.JSONObject;
 
-/**
- *
- * @author Alonso
- */
 public interface UbigeoDAO {
 
   public JSONObject listarDepartamento();

src/java/demojsoncrud/services/PersonaService.java

 package demojsoncrud.services;
 
-import demojsoncrud.beans.PersonaBean;
 import demojsoncrud.dao.DAOFactory;
 import demojsoncrud.dao.PersonaDAO;
 import org.json.JSONObject;
@@ -8,14 +7,14 @@ import org.json.JSONObject;
 public class PersonaService {
 
   DAOFactory daoFactory = DAOFactory.getDAOFactory(DAOFactory.SQL_SERVER);
-    PersonaDAO service = daoFactory.getPersonaDAO();
+  PersonaDAO dao = daoFactory.getPersonaDAO();
 
-    public JSONObject listarPersona(String search, String draw, String start, String length) {
+  public JSONObject listarPersona(JSONObject datos) {
     JSONObject jsonReturn = null;
     try {
-            jsonReturn = service.listarPersona(search, draw, start, length);
+      jsonReturn = dao.listarPersona(datos);
     } catch (Exception e) {
-            e.getMessage();
+      System.out.println("Error PersonaService >> listarPersona >> " + e.getMessage());
     }
     return jsonReturn;
   }
@@ -23,9 +22,9 @@ public class PersonaService {
   public JSONObject registrarPersona(JSONObject datos) {
     JSONObject jsonReturn = null;
     try {
-            jsonReturn = service.registrarPersona(datos);
+      jsonReturn = dao.registrarPersona(datos);
     } catch (Exception e) {
-            e.getMessage();
+      System.out.println("Error PersonaService >> registrarPersona >> " + e.getMessage());
     }
     return jsonReturn;
   }
@@ -33,9 +32,9 @@ public class PersonaService {
   public JSONObject editarPersona(JSONObject datos) {
     JSONObject jsonReturn = null;
     try {
-            jsonReturn = service.editarPersona(datos);
+      jsonReturn = dao.editarPersona(datos);
     } catch (Exception e) {
-            e.getMessage();
+      System.out.println("Error PersonaService >> editarPersona >> " + e.getMessage());
     }
     return jsonReturn;
   }
@@ -43,8 +42,9 @@ public class PersonaService {
   public JSONObject cambiarEstado(JSONObject datos) {
     JSONObject respuesta = null;
     try {
-            respuesta = service.cambiarEstado(datos);
+      respuesta = dao.cambiarEstado(datos);
     } catch (Exception e) {
+      System.out.println("Error PersonaService >> cambiarEstado >> " + e.getMessage());
     }
     return respuesta;
   }

src/java/demojsoncrud/services/UbigeoService.java

 package demojsoncrud.services;
 
-import demojsoncrud.beans.UbigeoBean;
 import demojsoncrud.dao.DAOFactory;
 import demojsoncrud.dao.UbigeoDAO;
 import org.json.JSONObject;
@@ -8,13 +7,14 @@ import org.json.JSONObject;
 public class UbigeoService {
 
   DAOFactory daoFactory = DAOFactory.getDAOFactory(DAOFactory.SQL_SERVER);
-    UbigeoDAO service = daoFactory.getUbigeoDAO();
+  UbigeoDAO dao = daoFactory.getUbigeoDAO();
 
   public JSONObject listarDepartamento() {
     JSONObject jsonReturn = null;
     try {
-            jsonReturn = service.listarDepartamento();
+      jsonReturn = dao.listarDepartamento();
     } catch (Exception e) {
+      System.out.println("Error UbigeoService >> listarDepartamento >> " + e.getMessage());
     }
     return jsonReturn;
   }
@@ -22,8 +22,9 @@ public class UbigeoService {
   public JSONObject listarProvincia(JSONObject datos) {
     JSONObject jsonReturn = null;
     try {
-            jsonReturn = service.listarProvincia(datos);
+      jsonReturn = dao.listarProvincia(datos);
     } catch (Exception e) {
+      System.out.println("Error UbigeoService >> listarProvincia >> " + e.getMessage());
     }
     return jsonReturn;
   }
@@ -31,8 +32,9 @@ public class UbigeoService {
   public JSONObject listarDistrito(JSONObject datos) {
     JSONObject jsonReturn = null;
     try {
-            jsonReturn = service.listarDistrito(datos);
+      jsonReturn = dao.listarDistrito(datos);
     } catch (Exception e) {
+      System.out.println("Error UbigeoService >> listarDistrito >> " + e.getMessage());
     }
     return jsonReturn;
   }

src/java/demojsoncrud/servlets/PersonaServlet.java

 package demojsoncrud.servlets;
 
 import demojsoncrud.services.PersonaService;
-import static demojsoncrud.utilities.CustomHttpServletRequest.getBodyJsonObject;
 import java.io.IOException;
 import java.io.PrintWriter;
 import javax.servlet.ServletException;
@@ -46,12 +45,15 @@ public class PersonaServlet extends HttpServlet {
     PrintWriter pw = response.getWriter();
     PersonaService service = new PersonaService();
 
-        String draw = request.getParameter("draw");
-        String start = request.getParameter("start");
-        String length = request.getParameter("length");
     String search = request.getParameter("search");
 
-        JSONObject json = service.listarPersona(search, draw, start, length);
+    JSONObject datos = new JSONObject();
+    datos.put("draw", request.getParameter("draw"));
+    datos.put("start", request.getParameter("start"));
+    datos.put("length", request.getParameter("length"));
+    datos.put("search", search);
+
+    JSONObject json = service.listarPersona(datos);
     pw.print(json);
   }
 
@@ -59,9 +61,8 @@ public class PersonaServlet extends HttpServlet {
     response.setContentType("application/json");
     PrintWriter pw = response.getWriter();
     PersonaService service = new PersonaService();
-        JSONObject datos = new JSONObject();
-        datos = getBodyJsonObject(request);
-        JSONObject respuesta = service.registrarPersona(datos.getJSONObject("json"));
+    JSONObject datos = new JSONObject(request.getParameter("json"));
+    JSONObject respuesta = service.registrarPersona(datos);
     pw.print(respuesta);
 
   }
@@ -70,9 +71,8 @@ public class PersonaServlet extends HttpServlet {
     response.setContentType("application/json");
     PrintWriter pw = response.getWriter();
     PersonaService service = new PersonaService();
-        JSONObject datos = new JSONObject();
-        datos = getBodyJsonObject(request);
-        JSONObject respuesta = service.editarPersona(datos.getJSONObject("json"));
+    JSONObject datos = new JSONObject(request.getParameter("json"));
+    JSONObject respuesta = service.editarPersona(datos);
     pw.print(respuesta);
   }
 
@@ -80,9 +80,8 @@ public class PersonaServlet extends HttpServlet {
     response.setContentType("application/json");
     PrintWriter pw = response.getWriter();
     PersonaService service = new PersonaService();
-        JSONObject datos = new JSONObject();
-        datos = getBodyJsonObject(request);
-        JSONObject respuesta = service.cambiarEstado(datos.getJSONObject("json"));
+    JSONObject datos = new JSONObject(request.getParameter("json"));
+    JSONObject respuesta = service.cambiarEstado(datos);
     System.out.println(respuesta);
     pw.print(respuesta);
   }

src/java/demojsoncrud/servlets/UbigeoServlet.java

 package demojsoncrud.servlets;
 
 import demojsoncrud.services.UbigeoService;
-import static demojsoncrud.utilities.CustomHttpServletRequest.getBodyJsonObject;
 import java.io.IOException;
 import java.io.PrintWriter;
 import javax.servlet.ServletException;
@@ -16,12 +15,28 @@ public class UbigeoServlet extends HttpServlet {
   protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     String param = request.getParameter("accion");
     response.setCharacterEncoding("UTF-8");
-        if ("listarDepartamento".equals(param)) {
+    if (null != param) {
+      switch (param) {
+        case "listarDepartamento":
           listarDepartamento(request, response);
-        } else if ("listarProvincia".equals(param)) {
+          break;
+        case "listarProvincia":
           listarProvincia(request, response);
-        } else if ("listarDistrito".equals(param)) {
+          break;
+        case "listarDistrito":
           listarDistrito(request, response);
+          break;
+        default:
+          response.setContentType("application/json");
+          PrintWriter pw = response.getWriter();
+          JSONObject respuesta = new JSONObject();
+          respuesta
+            .put("status", false)
+            .put("message", "No existe la url solicitada.")
+            .put("data", "");
+          pw.print(respuesta);
+          break;
+      }
     }
   }
 
@@ -37,9 +52,8 @@ public class UbigeoServlet extends HttpServlet {
     response.setContentType("application/json");
     PrintWriter pw = response.getWriter();
     UbigeoService service = new UbigeoService();
-        JSONObject datos = new JSONObject();
-        datos = getBodyJsonObject(request);
-        JSONObject respuesta = service.listarProvincia(datos.getJSONObject("json"));
+    JSONObject datos = new JSONObject(request.getParameter("json"));
+    JSONObject respuesta = service.listarProvincia(datos);
     pw.print(respuesta);
   }
 
@@ -47,9 +61,8 @@ public class UbigeoServlet extends HttpServlet {
     response.setContentType("application/json");
     PrintWriter pw = response.getWriter();
     UbigeoService service = new UbigeoService();
-        JSONObject datos = new JSONObject();
-        datos = getBodyJsonObject(request);
-        JSONObject respuesta = service.listarDistrito(datos.getJSONObject("json"));
+    JSONObject datos = new JSONObject(request.getParameter("json"));
+    JSONObject respuesta = service.listarDistrito(datos);
     pw.print(respuesta);
   }
 

src/java/demojsoncrud/sqlserverdao/UbigeoSqlserverDAO.java

-/*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
 package demojsoncrud.sqlserverdao;
 
 import demojsoncrud.beans.UbigeoBean;
@@ -15,15 +10,11 @@ import java.sql.SQLException;
 import org.json.JSONArray;
 import org.json.JSONObject;
 
-/**
- *
- * @author Alonso
- */
 public class UbigeoSqlserverDAO implements UbigeoDAO {
 
   @Override
   public JSONObject listarDepartamento() {
-        JSONObject jsonReturn = new JSONObject();
+    JSONObject jsonReturn = null;
     JSONArray data = new JSONArray();
     PreparedStatement psListarDepartamento = null;
     ResultSet rsListarDepartamento = null;
@@ -60,6 +51,7 @@ public class UbigeoSqlserverDAO implements UbigeoDAO {
     } catch (SQLException e) {
       response.setMessage("Error al listarDepartamento -> " + e.getMessage() + " Error code [" + e.getErrorCode() + "].");
       response.setStatus(false);
+      System.err.println("Error al registrar -> " + e.getMessage() + "[" + e.getErrorCode() + "]");
     } finally {
       try {
         if (rsListarDepartamento != null) {
@@ -72,21 +64,19 @@ public class UbigeoSqlserverDAO implements UbigeoDAO {
           connection.close();
         }
       } catch (SQLException e) {
-                response.setMessage("Error al listarDepartamento -> " + e.getMessage() + " Error code [" + e.getErrorCode() + "].");
-                response.setStatus(false);
+        System.err.println("Error: ha ocurrido un error al intentar cerrar las conexiones y/o liberacion de recursos -> " + e.getMessage());
       }
 
     }
 
     jsonReturn = new JSONObject(response);
-
     return jsonReturn;
   }
 
   @Override
   public JSONObject listarProvincia(JSONObject datos) {
     System.out.println(datos);
-        JSONObject jsonReturn = new JSONObject();
+    JSONObject jsonReturn = null;
     JSONArray data = new JSONArray();
     PreparedStatement psListarProvincia = null;
     ResultSet rsListarProvincia = null;
@@ -125,6 +115,7 @@ public class UbigeoSqlserverDAO implements UbigeoDAO {
     } catch (SQLException e) {
       response.setMessage("Error al listarProvincia -> " + e.getMessage() + " Error code [" + e.getErrorCode() + "].");
       response.setStatus(false);
+      System.err.println("Error al registrar -> " + e.getMessage() + "[" + e.getErrorCode() + "]");
     } finally {
       try {
         if (rsListarProvincia != null) {
@@ -137,20 +128,18 @@ public class UbigeoSqlserverDAO implements UbigeoDAO {
           connection.close();
         }
       } catch (SQLException e) {
-                response.setMessage("Error al listarProvincia -> " + e.getMessage() + " Error code [" + e.getErrorCode() + "].");
-                response.setStatus(false);
+        System.err.println("Error: ha ocurrido un error al intentar cerrar las conexiones y/o liberacion de recursos -> " + e.getMessage());
       }
 
     }
 
     jsonReturn = new JSONObject(response);
-
     return jsonReturn;
   }
 
   @Override
   public JSONObject listarDistrito(JSONObject datos) {
-        JSONObject jsonReturn = new JSONObject();
+    JSONObject jsonReturn = null;
     JSONArray data = new JSONArray();
     PreparedStatement psListarDistrito = null;
     ResultSet rsListarDistrito = null;
@@ -189,6 +178,7 @@ public class UbigeoSqlserverDAO implements UbigeoDAO {
     } catch (SQLException e) {
       response.setMessage("Error al listarDistrito -> " + e.getMessage() + " Error code [" + e.getErrorCode() + "].");
       response.setStatus(false);
+      System.err.println("Error al registrar -> " + e.getMessage() + "[" + e.getErrorCode() + "]");
     } finally {
       try {
         if (rsListarDistrito != null) {
@@ -201,14 +191,11 @@ public class UbigeoSqlserverDAO implements UbigeoDAO {
           connection.close();
         }
       } catch (SQLException e) {
-                response.setMessage("Error al listarDistrito -> " + e.getMessage() + " Error code [" + e.getErrorCode() + "].");
-                response.setStatus(false);
+        System.err.println("Error: ha ocurrido un error al intentar cerrar las conexiones y/o liberacion de recursos -> " + e.getMessage());
       }
-
     }
 
     jsonReturn = new JSONObject(response);
-
     return jsonReturn;
   }
 

src/java/demojsoncrud/utilities/CustomHttpServletRequest.java

-package demojsoncrud.utilities;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import javax.servlet.http.HttpServletRequest;
-import org.json.JSONObject;
-
-public class CustomHttpServletRequest {
-
-    public static JSONObject getBodyJsonObject(HttpServletRequest request) throws IOException {
-        String body = "";
-        if (request.getMethod().equals("POST")) {
-            StringBuilder sb = new StringBuilder();
-            BufferedReader bufferedReader = null;
-
-            bufferedReader = request.getReader(); // swallow silently -- can't get body, won't
-            char[] charBuffer = new char[128];
-            int bytesRead;
-            while ((bytesRead = bufferedReader.read(charBuffer)) != -1) {
-                sb.append(charBuffer, 0, bytesRead);
-            }
-            if (bufferedReader != null) {
-                bufferedReader.close(); // swallow silently -- can't get body, won't
-            }
-            body = sb.toString();
-        }
-        JSONObject respuesta = new JSONObject(body);
-        return respuesta;
-    }
-
-}

src/java/demojsoncrud/utilities/ResponseHelper.java

@@ -10,7 +10,12 @@ public class ResponseHelper implements Serializable {
   private String message;
 
   public ResponseHelper() {
+  }
 
+  public ResponseHelper(JSONObject data, boolean status, String message) {
+    this.data = data;
+    this.status = status;
+    this.message = message;
   }
 
   public JSONObject getData() {

web/js/general.js

 /**
- * Facilita el uso de fetch
- * @method fetchSo
- * @param {String} url nombre de objeto
- * @param {object} object mensaje a mostrar
- * @returns {Promise} Promise retorna status, msg
- */
-let fetchSo = (url, object) => {
-    return new Promise(
-      (resolve, reject) => {
-          let header = {
-              'Accept': 'application/json, text/plain, */*',
-              'Content-Type': 'application/json; charset=utf-8'
-          }
-          let requestInfo = {
-              method: 'post',
-              headers: header,
-              body: JSON.stringify({json: object})
-          }
-          fetch(url, requestInfo)
-            .then((res) => {
-                return res.json()
-            })
-            .then((res) => {
-                if (res.status) {
-                    resolve(res)
-                } else {
-                    reject(res)
-                }
-            })
-            .catch((error) => {
-                reject(error)
-            })
-      }
-    )
-}
-
-/**
  * Crea los elementos option del array que se pase como parametro
  * @method createSelectOptions
  * @param {JSONArray} obj array de objetos
@@ -52,7 +15,7 @@ let createSelectOptions = (obj, valueName, textName) => {
 }
 
 let customSwal = {
-    alert (title, text, type) {
+  alert(title, text, type) {
     let colors = {
       success: '#66BB6A',
       error: '#EF5350',
@@ -92,35 +55,15 @@ let getClosest = (elem, selector) => {
       function (s) {
         var matches = (this.document || this.ownerDocument).querySelectorAll(s),
           i = matches.length
-              while (--i >= 0 && matches.item(i) !== this) {}
+        while (--i >= 0 && matches.item(i) !== this) {
+        }
         return i > -1
       }
   }
   // Get closest match
   for (; elem && elem !== document; elem = elem.parentNode) {
-        if (elem.matches(selector)) return elem
+    if (elem.matches(selector))
+      return elem
   }
   return null
 }
-// function imprimirAlerta (title, text, type) {
-//     var s_col =
-//     var e_col = '#EF5350'
-//     var w_col = '#FF7043'
-//     var btnCol
-//
-//     if (type === 'error') {
-//         btnCol = e_col
-//     } else if (type === 'warning') {
-//         btnCol = w_col
-//     } else {
-//         btnCol = s_col
-//     }
-//
-//     swal({
-//         title: title,
-//         text: text,
-//         confirmButtonColor: btnCol,
-//         type: type
-//     })
-//
-// }
\ No newline at end of file

web/js/pages/persona.js

 let jqueryValidateConfig = () => {
-    function stripHtml (value) {
+  function stripHtml(value) {
     // remove html tags and space chars
     return value.replace(/<.[^<>]*?>/g, ' ').replace(/&nbsp;|&#160;/gi, ' ')
       // remove numbers and punctuation
@@ -57,7 +57,7 @@ let jqueryValidateConfig = () => {
   })
 }
 let persona = {
-    listar () {
+  listar() {
     let txtCriterioBusqueda = $('#txt-busqueda').val().trim()
     return new Promise((resolve) => {
       $('#tbl-persona').DataTable().destroy()
@@ -136,18 +136,26 @@ let persona = {
       })
     })
   },
-    cambiarEstado (datos) {
+  cambiarEstado(datos) {
     return new Promise((resolve, reject) => {
-            fetchSo('../PersonaServlet?accion=cambiarEstado', datos)
-              .then((data) => {
+      $.ajax({
+        url: '../PersonaServlet',
+        dataType: 'json',
+        type: 'POST',
+        data: {
+          accion: 'cambiarEstado',
+          json: JSON.stringify(datos)
+        }, beforeSend: function (xhr) {
+
+        }, success: function (data, textStatus, jqXHR) {
           resolve(data)
-              })
-              .catch((data) => {
-                  reject(data)
+        }, error: function (jqXHR, textStatus, errorThrown) {
+          reject("Error al cambiar estado")
+        }
       })
     })
   },
-    registrar () {
+  registrar() {
     let json = {
       dni: $('#txt_numero_documento').val().trim(),
       apellidos: $('#txt_apellidos').val().trim(),
@@ -156,6 +164,22 @@ let persona = {
       correo: $('#txt_correo').val().trim()
     }
     return new Promise((resolve, reject) => {
+      $.ajax({
+        url: '../PersonaServlet',
+        dataType: 'json',
+        type: 'POST',
+        data: {
+          accion: 'registrarPersona',
+          json: JSON.stringify(json)
+        }, beforeSend: function (xhr) {
+
+        }, success: function (data, textStatus, jqXHR) {
+          resolve(data)
+        }, error: function (jqXHR, textStatus, errorThrown) {
+          reject("Error al registrar personal")
+        }
+      })
+
       fetchSo('../PersonaServlet?accion=registrarPersona', json)
         .then((data) => {
           resolve(data)
@@ -165,7 +189,7 @@ let persona = {
         })
     })
   },
-    editar () {
+  editar() {
     let json = {
       apellidos: $('#txt_apellidos_editar').val().trim(),
       nombres: $('#txt_nombres_editar').val().trim(),
@@ -174,12 +198,20 @@ let persona = {
       codigo: localStorage.getItem('codigoPersona')
     }
     return new Promise((resolve, reject) => {
-            fetchSo('../PersonaServlet?accion=editarPersona', json)
-              .then((data) => {
+      $.ajax({
+        url: '../PersonaServlet',
+        dataType: 'json',
+        type: 'POST',
+        data: {
+          accion: 'editarPersona',
+          json: JSON.stringify(json)
+        }, beforeSend: function (xhr) {
+
+        }, success: function (data, textStatus, jqXHR) {
           resolve(data)
-              })
-              .catch((data) => {
-                  reject(data)
+        }, error: function (jqXHR, textStatus, errorThrown) {
+          reject("Error al editar persona")
+        }
       })
     })
   }

web/js/pages/ubigeo.js

 let ubigeo = {
-    consultarDepartamento () {
+  consultarDepartamento() {
     return new Promise((resolve, reject) => {
-            fetchSo('../UbigeoServlet?accion=listarDepartamento')
-              .then((data) => {
+      $.ajax({
+        url: '../UbigeoServlet',
+        dataType: 'json',
+        type: 'POST',
+        data: {
+          accion: 'listarDepartamento'
+        }, beforeSend: function (xhr) {
+
+        }, success: function (data, textStatus, jqXHR) {
           resolve(data)
-              })
-              .catch((data) => {
-                  reject(data)
+        }, error: function (jqXHR, textStatus, errorThrown) {
+          reject("Error al listar departamentos")
+        }
       })
     })
   },
-    consultarProvincia (codigoDepartamento) {
+  consultarProvincia(codigoDepartamento) {
     let json = {
       codigoDepartamento: codigoDepartamento
     }
     return new Promise((resolve, reject) => {
-            fetchSo('../UbigeoServlet?accion=listarProvincia', json)
-              .then((data) => {
+      $.ajax({
+        url: '../UbigeoServlet',
+        dataType: 'json',
+        type: 'POST',
+        data: {
+          accion: 'listarProvincia',
+          json: JSON.stringify(json)
+        }, beforeSend: function (xhr) {
+
+        }, success: function (data, textStatus, jqXHR) {
           resolve(data)
-              })
-              .catch((data) => {
-                  reject(data)
+        }, error: function (jqXHR, textStatus, errorThrown) {
+          reject("Error al listar provincias")
+        }
       })
     })
   },
-    consultarDistrito (codigoDepartamento, codigoProvincia) {
+  consultarDistrito(codigoDepartamento, codigoProvincia) {
     let json = {
       codigoProvincia: codigoProvincia,
       codigoDepartamento: codigoDepartamento
     }
+
     return new Promise((resolve, reject) => {
-            fetchSo('../UbigeoServlet?accion=listarDistrito', json)
-              .then((data) => {
+      $.ajax({
+        url: '../UbigeoServlet',
+        dataType: 'json',
+        type: 'POST',
+        data: {
+          accion: 'listarDistrito',
+          json: JSON.stringify(json)
+        }, beforeSend: function (xhr) {
+
+        }, success: function (data, textStatus, jqXHR) {
           resolve(data)
-              })
-              .catch((data) => {
-                  reject(data)
+        }, error: function (jqXHR, textStatus, errorThrown) {
+          reject("Error al listar distritos")
+        }
       })
     })
   }
@@ -54,6 +78,8 @@ let asignarEventos = () => {
         slProvincia.innerHTML = opt
       })
       .then(() => {
+        slDistrito.innerHTML = '<option value="0">[ SELECCIONE ]</option>'
+        $('#select_distrito').selectpicker('refresh')
         $('#select_provincia').selectpicker('refresh')
       })
   })