Agfdhyk

I created an application which has to open a window when I press on a determinate button. Now, the first part (where I create the layout with all the buttons/textfields/etc..) works, but when I try to set the action that the button has to do I get a list of error on the Button itself. This is the code of my Button Controller:

public class ButtonController {



@FXML

private Button scrivi;



@FXML

private Button reply;



@FXML

private Button replyall;



@FXML

private Button forward;



private DataModel model;



public void initModel(DataModel model) {

    if (this.model != null) {

        throw new IllegalStateException("Model can only be initialized once");

    }

    this.model = model;



    scrivi.setOnMouseClicked((event) -> {

        try {

            FXMLLoader pagina = new FXMLLoader(getClass().getResource("panel.fxml"));

            BorderPane root = new BorderPane(pagina.load());

            PanelController pc = pagina.getController();

            pc.initModel(model);

            Scene scene = new Scene(root, 603, 403);

            Stage stage = new Stage();

            stage.setScene(scene);

            stage.show();

        } catch (IOException e) {

            Logger logger = Logger.getLogger(getClass().getName());

            logger.log(Level.SEVERE, "Failed to create new Window.", e);

        }

    });

}

This is the FXML of the Panel I want to create:

    <BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="PanelController">

   <top>

      <AnchorPane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">

         <children>

            <TextField fx:id="dest" layoutX="53.0" layoutY="51.0" />

            <TextField fx:id="cc" layoutX="53.0" layoutY="92.0" />

            <TextField fx:id="mitt" layoutX="53.0" layoutY="135.0" />

            <Label layoutX="29.0" layoutY="56.0" text="A:" />

            <Label layoutX="24.0" layoutY="97.0" text="CC:" />

            <Label layoutX="25.0" layoutY="140.0" text="Da:" />

            <TextField fx:id="obj" layoutX="53.0" layoutY="173.0" />

            <Label layoutX="22.0" layoutY="178.0" text="Obj:" />

            <Button layoutX="539.0" layoutY="14.0" mnemonicParsing="false" text="Invia" />

         </children>

      </AnchorPane>

   </top>

   <bottom>

      <TextArea id="testo" prefHeight="182.0" prefWidth="564.0" BorderPane.alignment="CENTER" />

   </bottom>

</BorderPane>

This is the part (which works) of the first panel of the application:

public class MailBox extends Application {



@Override

public void start(Stage stage) throws Exception {

    FXMLLoader listLoader = new FXMLLoader(getClass().getResource("lista.fxml"));

    FXMLLoader menuLoader = new FXMLLoader(getClass().getResource("menubar.fxml"));

    FXMLLoader textareaLoader = new FXMLLoader(getClass().getResource("textarea.fxml"));

    FXMLLoader fieldLoader = new FXMLLoader(getClass().getResource("textfield.fxml"));

    FXMLLoader buttonLoader = new FXMLLoader(getClass().getResource("button.fxml"));



    AnchorPane root = new AnchorPane(listLoader.load(), textareaLoader.load(), fieldLoader.load(), menuLoader.load(), buttonLoader.load());



    ListController listController = listLoader.getController();

    MenuBarController menuController = menuLoader.getController();

    TextAreaController textareaController = textareaLoader.getController();

    TextFieldController fieldController = fieldLoader.getController();

    ButtonController buttonController = buttonLoader.getController();



    DataModel model = new DataModel();

    listController.initModel(model);

    menuController.initModel(model);

    textareaController.initModel(model);

    fieldController.initModel(model);

    buttonController.initModel(model);



    Scene scene = new Scene(root, 603, 403);

    stage.setScene(scene);

    stage.show();

}

This is the error I get when I try to execute the program:

Exception in Application start method

java.lang.reflect.InvocationTargetException

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:498)

	at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)

	at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

	at java.lang.reflect.Method.invoke(Method.java:498)

	at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)

Caused by: java.lang.RuntimeException: Exception in Application start method

	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)

	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)

	at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.NullPointerException

	at mailbox.ButtonController.initModel(ButtonController.java:47)

	at mailbox.MailBox.start(MailBox.java:43)

	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)

	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)

	at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)

	at java.security.AccessController.doPrivileged(Native Method)

	at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)

	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)

Exception running application mailbox.MailBox