MVC with multiple controllers

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I'm going crazy with the making of an application in Java/JavaFX.

I have a project with more fxml files, each with a controller (exactly like this example JavaFX TabPane - One controller for each tab )

This is the main fxml file (screentab.fxml), with multiple fx:include.

<TabPane fx:id="tabPane" BorderPane.alignment="CENTER">
    <tabs>
     <Tab text="Studenti">
           <content>
           <fx:include fx:id="Studenti" source="tabStudenti.fxml" />
            </content>
           </Tab>
      <Tab text="Percorsi &#10;formativi">
      <content>
      <fx:include fx:id="tabPercorsiFormativi" source="tabPercorsiFormativi.fxml" />
      </content>
           </Tab>
        <Tab text="Calendario &#10;delle&#10;lezioni">
          <content>
         <fx:include fx:id="tabCalendario" source="tabCalendario.fxml" />   
          </content>
           </Tab>
    </tabs>
       </TabPane>

It works, but I have a problem with the model, I think.

Below the file Main.java

public class Main extends Application {
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Manage your student");
        Model model = new Model();
        try {
            FXMLLoader loader = new FXMLLoader(getClass().getResource("gui/screentab.fxml"));
            BorderPane root = (BorderPane)loader.load();
            SoftwareController controller = loader.getController();
            controller.setModel(model);
            Scene scene = new Scene(root,1000,600);
            scene.getStylesheets().add(getClass().getResource("gui/stylesheet1.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

This is the main controller (SoftwareController.java) with the method setModel();

public class SoftwareController {

    private Model model;

    @FXML private TabPane tabPane;

    @FXML private tabCalendarioController tabCalendarioController;
    @FXML private tabPercorsiFormativiController tabPercorsiFormativiController;
    @FXML private tabStudentiController tabStudentiController;


    public void setModel(Model model) {
        this.model = model;
    }

    @FXML
    void initialize() {
        assert tabPane != null : "fx:id=\"tabPane\" was not injected: check your FXML file 'screentab.fxml'.";
        tabStudentiController.init(this);
        tabCalendarioController.init(this);
        tabPercorsiFormativiController.init(this);
    }

}

The model call the DAO and contains all the methods, called from the multiple controllers.

public class Model {

    StudentiDAO dao = new StudentiDAO();
    List<Studente> elencoStudenti = new ArrayList<Studente>();

    public List<Studente> elencaStudenti(){
        elencoStudenti= dao.listaStudenti();
        return elencoStudenti;

    }
}

And this is one of the controllers, that call the method of the model.

public class tabStudentiController {
    private SoftwareController main;
    private Model model;

    @FXML
    private Button btnElencoStudenti;

    @FXML
    public void doVisualizzaStudenti(ActionEvent event) {

        model.elencaStudenti();

        txtStudenti.appendText("Elenco studenti: \n");
        for(Studente s: lista ){

            txtStudenti.appendText(s.getStud_NOME()+ " "+ s.getStud_COGNOME()+ "\n");
        } 

    }

 public void setModel(Model model) {
            this.model = model ;
        }

    public void init(SoftwareController softwareController) {
    main = softwareController;

}


    @FXML
    void initialize() {
        assert tabPane != null : "fx:id=\"tabPane\" was not injected: check your FXML file 'screentab.fxml'.";
        assert tabStudenti != null : "fx:id=\"tabStudenti\" was not injected: check your FXML file 'screentab.fxml'.";
    }

}

The problem: when I press the button that does start the event doVisualizzaStudenti i have this error:

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
at javafx.event.Event.fireEvent(Unknown Source)
at javafx.scene.Node.fireEvent(Unknown Source)
at javafx.scene.control.Button.fire(Unknown Source)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(Unknown Source)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)


at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEventImpl(Unknown Source)
    at com.sun.javafx.event.EventUtil.fireEvent(Unknown Source)
    at javafx.event.Event.fireEvent(Unknown Source)
    at javafx.scene.Scene$MouseHandler.process(Unknown Source)
    at javafx.scene.Scene$MouseHandler.access$1500(Unknown Source)
    at javafx.scene.Scene.impl_processMouseEvent(Unknown Source)
    at javafx.scene.Scene$ScenePeerListener.mouseEvent(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(Unknown Source)
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(Unknown Source)
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(Unknown Source)
    at com.sun.glass.ui.View.handleMouseEvent(Unknown Source)
    at com.sun.glass.ui.View.notifyMouse(Unknown Source)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.Trampoline.invoke(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
    ... 57 more
Caused by: java.lang.NullPointerException
    at software.tabStudentiController.doVisualizzaStudenti(tabStudentiController.java:36)
    ... 66 more

where tabStudentiController.java:36 is the line with model.elencaStudenti().

Where I'm doing wrong? Please, help me and sorry for my bad english!

I changed the main with the callback and I added the setModel() in each nested controller. But now I have this error:

`javafx.fxml.LoadException: 
/C:/software/gui/screentab.fxml
at javafx.fxml.FXMLLoader.constructLoadException(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.load(Unknown Source)
at software.Main.start(Main.java:43)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
... 13 more
Caused by: java.lang.NullPointerException
at software.SoftwareController.initialize(SoftwareController.java:42)
... 22 more`

where Main.java:43 is the line BorderPane root = (BorderPane)loader.load() and SoftwareController.java:42 is: tabStudentiController.init(this);

What I'm wrong again?

javafx controller model-view-controller
3 Answers
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