FXML showing does not setText()

Hello world

I started playing a few days with JavaFX looks excellent! I am a beginner and got stuck on a trivial problem.
I played with two classes which extend 'Step' MainStage.java other MessageBox.java and MessageBoxOk.fxml
I'm trying to take another step the error message and display it in my MessageBox class.

PROBLEM:
-When I try to move the empty constructor error I get javafx.fxml.LoadException: java.lang.InstantiationException: org.testfx.admin.misc.MessageBox
-When I put it trough a public method in the MessageBox (as in the code below), I get no error but FXML displays earlier then the method is executed

How would pass all the data from one step to another step that it displays in FXML during initialization of the class. It seems that what I put the public method hollow is 'too late' and constructor to throw an error?

Thank you!

Method on the mainstage:

public void isDataOk() {
          if (checkFields(false)) {
               try {
                    AppDBAccess dbAccess = new AppDBAccess(tfHost.getText(), tfDbName.getText(), tfUsername.getText(), tfPassword.getText(),
                              Integer.valueOf(tfPort.getText()));
                    dbAccess.closeConnection();
                    lblStatus.setText(MyConstants.STRING_FIELD_CONNECTED);
               } catch (NumberFormatException e) {
                    e.printStackTrace();
                    MessageBox msgBox = new MessageBox(e.getMessage());
               }

MessageBox msgBox = new MessageBox();
msgBox.initMessageBox(e.getMessage(), MessageBox.MESSAGE_OK, "Connection Error");

My MessageBox.java:

public class MessageBox extends Stage {
     public static final int MESSAGE_OK = 1;

     @FXML
     private Label lblMessage = new Label();

     public void initMessageBox(String message, int messageType, String messageBoxTitle) {
          Parent fxmlFile = null;
          try {
               if (messageType == MESSAGE_OK) {
                    fxmlFile = FXMLLoader.load(getClass().getResource("MessageBoxOk.fxml"));
               }
               Scene scene = new Scene(fxmlFile);
               scene.getStylesheets().add("style.css");
               this.initModality(Modality.APPLICATION_MODAL);
               this.setResizable(false);
               this.setTitle(messageBoxTitle);
               this.setScene(scene);
               lblMessage.setText(message);
               show();
          } catch (IOException e) {
               e.printStackTrace();
          }
     }

My FXML:

<?import javafx.scene.layout.VBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Button?>

<VBox 
     id="someBox"
     prefHeight="100" 
     prefWidth="300"
     fx:controller="org.testfx.admin.misc.MessageBox"
     xmlns:fx="http://javafx.com/fxml">
     <children>
          <Label fx:id="lblMessage"></Label>
     </children>
</VBox>

Published by: 912911 on 7 February 2012 10:01

How you use FXML is not quite the way it is expected (though I would have preferred that it is how you try to use it because it would be much more intuitive and more versatile).

When you call FXMLLoader.load (getClass () .getResource ("MessageBoxOk.fxml")) the FXML charger has actually instantiates a new instance of the "controller", which in your case is MessageBox.java. In your code you manually instantiate a plus, so you end up with 2 instances of MessageBox.java, only one is actually connected to the view and the other is referenced by your code.

To do what you're trying to do, you will have to get my hands on the controller that was instantiated by the FXML charger and not 'new' your own copy. FXMLLoader allows to do this but only if you a few stop and use the non-static version of the load method.

There are a bunch of different ways to do it, but keeping relatively faithful to your current setup, I recommend you do something as follows:

public class MessageBox
{
    public static final enum Type { ok }

    public static void showMessageBox(String message, Type type, String title)
    {
        MessageBox messageBox;
        Parent messageBoxRootNode;
        switch (type)
        {
            case ok:
                String fxmlFile = "MessageBoxOk.fxml";
                try
                {
                    InputStream fxmlStream = MessageBox.class.getResourceAsStream(fxmlFile);
                    FXMLLoader loader = new FXMLLoader();
                    loader.setBuilderFactory(new JavaFXBuilderFactory());
                    loader.setLocation(MessageBox.class.getResource(fxmlFile));
                    messageBoxRootNode = (Parent) loader.load(fxmlStream);
                    messageBox = (MessageBox) loader.getController();
                }
                catch (IOException e)
                {
                    throw new RuntimeException("Failed to load FXML file: " + fxmlFile, e);
                }
                break;
            default:
                throw new IllegalArgumentException("Unsupported message type: " + type)
        }

        messageBox.setMessage(message);

        Scene scene = new Scene(messageBoxRootNode);
        scene.getStylesheets().add("style.css");
        Stage stage = new Stage();
        stage.initModality(Modality.APPLICATION_MODAL);
        stage.setResizable(false);
        stage.setTitle(title);
        stage.setScene(scene);
        stage.show();
    }

    @FXML private Label lblMessage = new Label();

    public void setMessage(String message)
    {
        lblMessage.setText(message);
    }
}

And from your code calling (i.e. your catch clause) do like this:

MessageBox.showMessageBox(e.getMessage(), MessageBox.MESSAGE_OK, "Connection Error");

Tags: Java

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