Ndtyjky

I am a new javafx user. I'm trying to create a basic application but I'm having some problems. I try, when closing a sub-window, to change the icons of my buttons by changing the Image inside my ImageView.

I have my main window :

<AnchorPane id="AnchorPane" prefHeight="651.0" prefWidth="823.0" 

   xmlns="http://javafx.com/javafx/10.0.1" 

   xmlns:fx="http://javafx.com/fxml/1" 

     fx:controller="amzevent.UI.FXMLMainUI">

    <children>

      <ScrollPane layoutX="14.0" layoutY="110.0" prefHeight="526.0" 

       prefWidth="796.0" />

        <ToolBar layoutX="14.0" layoutY="14.0" prefHeight="46.0" 

         prefWidth="796.0">

          <items>

            <Button minHeight="40.0" minWidth="40.0" mnemonicParsing="false" 

             prefHeight="34.0" prefWidth="40.0">

           <graphic>

              <ImageView fitHeight="30.0" fitWidth="30.0" 

               pickOnBounds="true" preserveRatio="true" 

               fx:id="bouton_retour">

                 <image>

                    <Image url="@../../resources/undo (1).png"   />

                 </image>

              </ImageView>

           </graphic>

           <tooltip>

              <Tooltip text="Annuler" />

           </tooltip>

        </Button>

     </items>

  </ToolBar>

  </children>

  </AnchorPane>

and the controller :

public class FXMLMainUI extends Controlleur implements Initializable {







@FXML 

private ImageView bouton_retour; 



@FXML

protected void ClickBoutonCreerSalle(ActionEvent event) {

    System.out.println("JavaMainUI : Click bouton créer salle");

    try {



        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("FXMLCreerSalle.fxml"));

        Parent root1 = (Parent) fxmlLoader.load();

        this.salle = new Stage();

        this.salle.setTitle("Nouvelle Salle");

        this.salle.setScene(new Scene(root1));

        this.salle.show();

    } catch (IOException ex) {

        Logger.getLogger(FXMLMainUI.class.getName()).log(Level.SEVERE, null, ex);

    }

    /*FXMLLoader loader = new FXMLLoader(getClass().getResource("FXMLMainUI.fxml"));

    try {

        Parent root = loader.load();

    } catch (IOException ex) {

        Logger.getLogger(FXMLMainUI.class.getName()).log(Level.SEVERE, null, ex);

    }*/

}





protected void CreerSalle(String nom_salle, int largeur_salle, int profondeur_salle) {

    super.CreerSalle(nom_salle, largeur_salle, profondeur_salle);

    System.out.println("JavaMainUI : Créer salle");

}





@FXML

protected void MettreBoutonCliquables() {

    System.out.println("JavaMainUI : MettreBoutonCliquables");

    Image img = new Image("resources/undo.png");

    this.bouton_retour.setImage(img);

}



@Override

public void initialize(URL url, ResourceBundle rb) {

    assert this.bouton_retour != null : "fx:id="bouton_retour" was null check your FXML "; 

    this.bouton_retour = new ImageView();

    System.out.println("JavaMainUI : Initialize ");

}    

public FXMLMainUI()

{

}

}

the other view :

   <AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" 

   xmlns="http://javafx.com/javafx/10.0.1" 

   xmlns:fx="http://javafx.com/fxml/1" 

   fx:controller="amzevent.UI.FXMLCreerSalle">

    <children>

    <Button layoutX="486.0" layoutY="326.0" mnemonicParsing="false" 

       text="Button" onAction="#SoumettreNouvelleSalle" />

    <Label layoutX="118.0" layoutY="132.0" prefHeight="17.0" 

     prefWidth="59.0" text="Nom" />

     <Label layoutX="116.0" layoutY="183.0" prefHeight="17.0" 

   prefWidth="65.0" text="Largeur" />

    <TextField layoutX="208.0" layoutY="128.0" fx:id="field_nom"/>

    <TextField layoutX="208.0" layoutY="179.0" fx:id="field_largeur"/>

    <TextField layoutX="208.0" layoutY="233.0" fx:id="field_profondeur"/>

    <Label layoutX="116.0" layoutY="237.0" prefHeight="17.0" 

     prefWidth="65.0" 

  text="Profondeur" />

    <Label layoutX="363.0" layoutY="183.0" text="en metre" />

    <Label layoutX="363.0" layoutY="237.0" text="en metre" />

  </children>

  </AnchorPane> 

the other controller :

  public class FXMLCreerSalle extends FXMLMainUI implements Initializable {



@FXML

private TextField field_nom;



@FXML

private TextField field_largeur;



@FXML

private TextField field_profondeur;







@FXML

protected void SoumettreNouvelleSalle(ActionEvent event) {

    System.out.println("JavaMainUI : Soumettre nouvelle salle");

    if (!this.field_nom.getText().equals("") && !this.field_largeur.getText().equals("") && !this.field_profondeur.getText().equals("")) {

        String nom_salle = this.field_nom.getText();

        int largeur_salle = 0;

        int profondeur_salle = 0;

        try {

            largeur_salle = Integer.parseInt(this.field_largeur.getText());

            profondeur_salle = Integer.parseInt(this.field_profondeur.getText());

        }  catch (NumberFormatException e) {

            System.out.println("JavaMainUI : largeur et profondeur doivent etre des nombre entiers"); 

            return;

        }

        System.out.println("JavaMainUI : " + nom_salle); 

        System.out.println("JavaMainUI : " + largeur_salle);

        System.out.println("JavaMainUI : " + profondeur_salle);

        Stage stage = (Stage) this.field_nom.getScene().getWindow();

        // do what you have to do

        stage.close();

        super.CreerSalle(nom_salle, largeur_salle, profondeur_salle);

        super.MettreBoutonCliquables();

    }

}



@Override

public void initialize(URL url, ResourceBundle rb) {



    // TODO

    //retour_couleur = new Image("resources/undo.png");

    //this.retour = new ImageView();

    //this.boutton_retour = new ImageView();

}    

}

when the sub windows closes, it calls super.MettreBoutonCliquables(); to change the Image of the ImageView with a new source.

When i run my program everything works fine until this.bouton_retour.setImage(img); -> java.lang.NullPointerException

I tried to add the followed lines to reload my fxml main file but didn't change anything.
FXMLLoader loader = new FXMLLoader(getClass().getResource("/amzevent/UI/FXMLMainUI.fxml"));
Parent root = loader.load();

In my initialize funtion the bouton_retour is not null.

I have no idea how to fix this, If anyone's ever had this kind of problem before, I'm a taker.