Nrthugu

I just made these three files with Scene Builder:

textfield.fxml:

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

    <TextField fx:id="id" layoutX="252.0" layoutY="39.0" prefHeight="27.0" prefWidth="35.0" />

    <TextField fx:id="mitt" layoutX="252.0" layoutY="73.0" />

    <TextField fx:id="dest" layoutX="252.0" layoutY="108.0" />

    <TextField fx:id="oggetto" layoutX="252.0" layoutY="144.0" />

    <TextField fx:id="data" layoutX="308.0" layoutY="39.0" prefHeight="27.0" prefWidth="110.0" />

</AnchorPane>

textarea.fxml:

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

        <TextArea id="textarea" editable="false" layoutX="240.0" layoutY="200.0" prefHeight="200.0" prefWidth="360.0" />

</AnchorPane>

lista.fxml:

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

    <ListView id="listView" layoutY="29.0" prefHeight="371.0" prefWidth="240.0" />

</AnchorPane>

Now, I added the elements both by passing them into the constructor of the Anchor Pane and with the AddAll method, but it didn't work:

public void start(Stage stage) throws Exception {



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

    ListController listController = listLoader.getController();



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

    TextAreaController textareaController = textareaLoader.getController();



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

    TextFieldController fieldController = fieldLoader.getController();



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

    //root.getChildren().addAll(listLoader.load(), textareaLoader.load(), fieldLoader.load());



    DataModel model = new DataModel();

    listController.initModel(model);

    textareaController.initModel(model);



    Scene scene = new Scene(root, 400, 600);

    stage.setScene(scene);

    stage.show();

}

This is the error:

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.MailBox.start(MailBox.java:38)

    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

Controllers created based on the fx:controller attribute in a fxml are only available after calling load. You need do the getController calls after the AnchorPane creation for this reason:

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

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

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



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



ListController listController = listLoader.getController();

TextAreaController textareaController = textareaLoader.getController();

TextFieldController fieldController = fieldLoader.getController();



DataModel model = new DataModel();

listController.initModel(model);

textareaController.initModel(model);



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