ManagmentUsersController.java
package com.my.app.controllers;

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.MenuBar;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;

import com.my.app.daoImpl.DbSingleton;
import com.my.app.models.User;
import com.my.app.others.ViewChanger;

public class ManagmentUsersController implements Initializable {

    @FXML
    private TableView<User> tableViewUser;

    @FXML
    private TableColumn<?, ?> tableColumnLastname;

    @FXML
    private Button btnEditUser;

    @FXML
    private Button btnRemoveUser;

    @FXML
    private Button btnAddUser;

    @FXML
    private Button btnRefreshUsers;

    @FXML
    private TableColumn<?, ?> tableColumnName;

    @FXML
    private TableColumn<?, ?> tableColumnRole;

    @FXML
    private TableColumn<?, ?> tableColumnId;

    @FXML
    private MenuBar menuBarUsers;

    @FXML
    private TableColumn<?, ?> tableColumnEmail;

    @FXML
    private TableColumn<?, ?> tableColumnLogin;

    @FXML
    private TableColumn<?, ?> tableColumnPassword;



    public TableView<User> getTableViewUser() {
        return tableViewUser;
    }

    public void setTableViewUser(TableView<User> tableViewUser) {
        this.tableViewUser = tableViewUser;
    }

    public Button getBtnRefreshUsers() {
        return btnRefreshUsers;
    }

    public void setBtnRefreshUsers(Button btnRefreshUsers) {
        this.btnRefreshUsers = btnRefreshUsers;
    }

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        // TODO Auto-generated method stub

        configureMenu();
        configureButtons();
        configureTableViewUser();
    }

    public void configureMenu(){

    }
    public void configureButtons(){
        btnAddUser.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                ViewChanger vch = new ViewChanger();
                vch.changeViewModalityWindow(
                        "/com/my/app/views/UserAddEditView.fxml", "Add user",
                        event);
            }
        });
        btnEditUser.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {

            }
        });

        btnRefreshUsers.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                tableViewUser.setItems(loadUsersToTableView());
            }
        });

    }

    public void configureTableViewUser(){
        tableColumnId.setCellValueFactory(new PropertyValueFactory<>(
                "id"));

        tableColumnLogin.setCellValueFactory(new PropertyValueFactory<>(
                "login"));
        tableColumnPassword.setCellValueFactory(new PropertyValueFactory<>(
                "password"));
        tableColumnRole.setCellValueFactory(new PropertyValueFactory<>(
                "role"));
        tableColumnName.setCellValueFactory(new PropertyValueFactory<>(
                "name"));
        tableColumnLastname.setCellValueFactory(new PropertyValueFactory<>(
                "lastname"));
        tableColumnEmail.setCellValueFactory(new PropertyValueFactory<>(
                "email"));


        //loadUsersToTableView();


        tableViewUser.setItems(loadUsersToTableView());
    }

    private  ObservableList<User> loadUsersToTableView(){
        DbSingleton db = DbSingleton.getInstance();
        ObservableList<User> listOfUsers = FXCollections.observableArrayList(db.getAllUsers());
        return listOfUsers;
    }
}

/********************************************************************************************************************/
UserController.java
package com.my.app.controllers;

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;

import com.my.app.daoImpl.DbSingleton;
import com.my.app.models.User;

public class UserController implements Initializable {

    final ObservableList<String> userRoles = FXCollections.observableArrayList(
            "superadministrator", "administrator", "użytkownik");

    @FXML
    private ManagmentUsersController managmentUserController;

    @FXML
    private TextField txtName;

    @FXML
    private TextField txtLastname;

    @FXML
    private TextField txtEmail;

    @FXML
    private Label lblEmail;

    @FXML
    private Label lblPassword;

    @FXML
    private Button btnClear;

    @FXML
    private ComboBox<String> cbRole;

    @FXML
    private Button btnConfirm;

    @FXML
    private TextField txtLogin;

    @FXML
    private Label lblName;

    @FXML
    private Label lblLastname;

    @FXML
    private Label lblRole;

    @FXML
    private Label lblLogin;

    @FXML
    private PasswordField txtPassword;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        // TODO Auto-generated method stub
        cbRole.setItems(userRoles);
        configureButtons();
    }

    public void configureButtons(){
        btnConfirm.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                DbSingleton db = DbSingleton.getInstance();
                User userToAdd = new User();
                userToAdd.setLogin(txtLogin.getText());;
                userToAdd.setPassword(txtPassword.getText());
                userToAdd.setRole(cbRole.getValue());
                userToAdd.setName(txtName.getText());
                userToAdd.setLastname(txtLastname.getText());
                userToAdd.setEmail(txtEmail.getText());
                //walidacja pol dorobic
                //pewnie hibernate - validator
                //pozytywny wynik dodajemy
                db.saveUser(userToAdd);

                //jesli dodal odswiez widok

                ObservableList<User> listOfUsers = FXCollections.observableArrayList(db.getAllUsers());
                managmentUserController.getTableViewUser().setItems(listOfUsers);

            }
        });
    }

}
/******************************************************************************************************************/
//Pliki widoku
UserAddEditView.fxml
<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.shape.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>

<BorderPane maxHeight="-Infinity" maxWidth="-Infinity"
    minHeight="-Infinity" minWidth="-Infinity" prefHeight="302.0"
    prefWidth="299.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1"
    fx:controller="com.my.app.controllers.UserController">
<!--    <children> -->
<!--        <fx:include fx:id="managmentUser" source="/com/my/app/views/ManagmentUsersView.fxml" /> -->
<!--    </children> -->
    <top>
        <MenuBar BorderPane.alignment="CENTER">
            <menus>
                <Menu mnemonicParsing="false" text="File">
                    <items>
                        <MenuItem mnemonicParsing="false" text="Close" />
                    </items>
                </Menu>
                <Menu mnemonicParsing="false" text="Edit">
                    <items>
                        <MenuItem mnemonicParsing="false" text="Delete" />
                    </items>
                </Menu>
                <Menu mnemonicParsing="false" text="Help">
                    <items>
                        <MenuItem mnemonicParsing="false" text="About" />
                    </items>
                </Menu>
            </menus>
        </MenuBar>
    </top>
    <center>
        <AnchorPane prefHeight="310.0" prefWidth="288.0"
            BorderPane.alignment="CENTER">
            <children>
                <Label fx:id="lblName" alignment="CENTER_RIGHT" layoutX="16.0"
                    layoutY="33.0" prefHeight="15.0" prefWidth="69.0" text="Name:" />
                <Label fx:id="lblLogin" alignment="CENTER_RIGHT" layoutX="16.0"
                    layoutY="156.0" prefHeight="15.0" prefWidth="69.0" text="Login:" />
                <Separator layoutX="91.0" layoutY="13.0" orientation="VERTICAL"
                    prefHeight="206.0" prefWidth="4.0" />
                <ComboBox fx:id="cbRole" layoutX="106.0" layoutY="92.0"
                    prefWidth="171.0" visibleRowCount="3" />
                <TextField fx:id="txtName" layoutX="106.0" layoutY="28.0"
                    prefWidth="171.0" promptText="Name" />
                <TextField fx:id="txtLastname" layoutX="106.0" layoutY="58.0"
                    prefWidth="171.0" promptText="Lastname" />
                <TextField fx:id="txtEmail" layoutX="106.0" layoutY="122.0"
                    prefWidth="171.0" promptText="Email" />
                <TextField fx:id="txtLogin" layoutX="106.0" layoutY="152.0"
                    prefWidth="171.0" promptText="Login" />
                <PasswordField fx:id="txtPassword" layoutX="106.0"
                    layoutY="182.0" prefWidth="171.0" promptText="Password" />
                <Button fx:id="btnClear" layoutX="53.0" layoutY="232.0"
                    mnemonicParsing="false" prefHeight="25.0" prefWidth="81.0" text="Clear" />
                <Button fx:id="btnConfirm" layoutX="151.0" layoutY="232.0"
                    mnemonicParsing="false" prefHeight="25.0" prefWidth="81.0" text="Confirm" />
                <Label fx:id="lblLastname" alignment="CENTER_RIGHT" layoutX="16.0"
                    layoutY="63.0" prefHeight="15.0" prefWidth="69.0" text="Lastname:" />
                <Label fx:id="lblRole" alignment="CENTER_RIGHT" layoutX="16.0"
                    layoutY="97.0" prefHeight="15.0" prefWidth="69.0" text="Role:" />
                <Label fx:id="lblEmail" alignment="CENTER_RIGHT" layoutX="16.0"
                    layoutY="126.0" prefHeight="15.0" prefWidth="69.0" text="Email:" />
                <Label fx:id="lblPassword" alignment="CENTER_RIGHT" layoutX="16.0"
                    layoutY="186.0" prefHeight="15.0" prefWidth="69.0" text="Password:" />
            </children>
        </AnchorPane>
    </center>
</BorderPane>

/*******************************************************************************************************************/
ManagmentUsersView.fxml
<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.BorderPane?>

<BorderPane prefHeight="361.0" prefWidth="615.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.my.app.controllers.ManagmentUsersController">

   <top>
      <MenuBar fx:id="menuBarUsers" BorderPane.alignment="CENTER">
        <menus>
          <Menu mnemonicParsing="false" text="File">
            <items>
              <MenuItem mnemonicParsing="false" text="Close" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Edit">
            <items>
              <MenuItem mnemonicParsing="false" text="Delete" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Help">
            <items>
              <MenuItem mnemonicParsing="false" text="About" />
            </items>
          </Menu>
        </menus>
      </MenuBar>
   </top>
   <center>
      <AnchorPane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
         <children>
            <TableView fx:id="tableViewUser" prefHeight="200.0" prefWidth="200.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
              <columns>
                <TableColumn fx:id="tableColumnId" prefWidth="75.0" text="ID" />
                <TableColumn fx:id="tableColumnLogin" prefWidth="75.0" text="Login" />
                  <TableColumn fx:id="tableColumnPassword" prefWidth="75.0" text="Password" />
                  <TableColumn fx:id="tableColumnRole" prefWidth="75.0" text="Rola" />
                  <TableColumn fx:id="tableColumnName" prefWidth="75.0" text="Name" />
                  <TableColumn fx:id="tableColumnLastname" prefWidth="75.0" text="Lastname" />
                  <TableColumn fx:id="tableColumnEmail" prefWidth="75.0" text="Email" />
              </columns>
               <columnResizePolicy>
                  <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
               </columnResizePolicy>
            </TableView>
         </children>
      </AnchorPane>
   </center>
   <bottom>
      <HBox prefHeight="100.0" prefWidth="200.0" BorderPane.alignment="CENTER">
         <children>
            <Button fx:id="btnAddUser" mnemonicParsing="false" text="Add user" />
            <Button fx:id="btnEditUser" mnemonicParsing="false" text="Edit user" />
            <Button fx:id="btnRemoveUser" mnemonicParsing="false" text="Remove user" />
            <Button fx:id="btnRefreshUsers" mnemonicParsing="false" text="Refresh" />
         </children>
      </HBox>
   </bottom>
</BorderPane>