[EDIT] SELECT2 EN LA VISTA mantenimientoMenu.jsp

src/main/java/com/mycompany/moduloseguridad/mysqldao/MenuMYSQLDAO.java

@@ -1895,7 +1895,7 @@ public class MenuMYSQLDAO implements MenuDAO {
 		    + " from modulo as a  "
 		    + " where true "
 		    + condicion
-				+ "ORDER BY 1 desc limit "+start+","+length+" ; ";
+				+ " group by nom ORDER BY 1 desc limit "+start+","+length+" ; ";
 	    pst = con.prepareStatement(sql);
 	    rsLlave = pst.executeQuery();
 	    while (rsLlave.next()) {
@@ -1979,7 +1979,7 @@ public class MenuMYSQLDAO implements MenuDAO {
 		    + "from categoria as a  "
 		    + "where true  "
 		    + condicion
-				+ "ORDER BY 1 desc limit "+start+","+length+" ; ";
+				+ " group by nom ORDER BY 1 desc limit "+start+","+length+" ; ";
 	    pst = con.prepareStatement(sql);
 	    rsLlave = pst.executeQuery();
 	    while (rsLlave.next()) {
@@ -2063,7 +2063,7 @@ public class MenuMYSQLDAO implements MenuDAO {
 		    + "from subcategoria as a  "
 		    + "where true "
 		    + condicion
-				+ "ORDER BY 1 desc limit "+start+","+length+" ; ";
+				+ " group by nom ORDER BY 1 desc limit "+start+","+length+" ; ";
 	    pst = con.prepareStatement(sql);
 	    rsLlave = pst.executeQuery();
 	    while (rsLlave.next()) {

src/main/webapp/js/pages/MantenimientoMenu.js

@@ -38,8 +38,8 @@ let tipo_usuario_nombre = "";
    }
 
    $('#btnLimpiar').click(function () {
-      $('#cboTipoUsuario').val("");
-      $('#cboProyecto').val("");
+      $('#cboTipoUsuario').val(null).trigger('change');
+      $('#cboProyecto').val(null).trigger('change');
       $('#cboTipoUsuario').attr('disabled', true);
       $('#btnBuscar').attr('disabled', true);
       recargar();

src/main/webapp/vistas/mantenimientoMenu.jsp

@@ -180,6 +180,8 @@
         <script src="../js/lib/jquery-editable-select.min.js" type="text/javascript"></script>
         <script src="../js/pages/MantenimientoMenu.js" type="text/javascript"></script>
         <script>
+            $('#cboProyecto').select2();
+            $('#cboTipoUsuario').select2();
             let switchery = new Switchery(document.querySelector('#cbkEstado'), {color: 'red', secondaryColor: 'green'});
             let switchery2 = new Switchery(document.querySelector('#cbkPermisos'), {color: 'red', secondaryColor: 'green'});
             $('.heading-elements').css('display','flex');