Why does adding a TextField to my JavaFX cause multiple exceptions? [duplicate]

Question

I am attempting to create multiple JavaFX applications and have had no issues until now when I attempt to add a TextField. I can have a brand new file and include a single line initializing a TextField and it will cause the exceptions. I have looked all over online and got nothing. Simply adding the TextField causes the exceptions to appear even in other, previously running,k programs. Examples below:

The program I have created so far:

public class CH16Q04 extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        VBox masterPane = new VBox();
        HBox milesPane = new HBox();
        HBox kiloPane = new HBox();


        javafx.scene.control.TextField milesTF = new TextField("Miles: ");
        milesTF.setAlignment(Pos.BASELINE_RIGHT);
        javafx.scene.control.TextField kiloTF = new TextField("Kilometers" );
        kiloTF.setAlignment(Pos.BASELINE_RIGHT);

        milesPane.getChildren().addAll(new Label("Miles: "), milesTF);
        kiloPane.getChildren().addAll(new Label("Kilometers: "), kiloTF);
        masterPane.getChildren().addAll(milesPane,kiloPane);
        BigDecimal milesInput = new BigDecimal(milesTF.getText());
        BigDecimal kiloInput = new BigDecimal(kiloTF.getText());

        milesTF.setOnAction(e -> {

            kiloTF.setText((milesInput.multiply(new 
            BigDecimal("1.609344")).toString()));
            kiloTF.setStyle("-fx-text-fill: red");
        });

        kiloTF.setOnAction(e -> {

            milesTF.setText(kiloInput.multiply(new 
            BigDecimal("0.621371")).toString());
            milesTF.setStyle("-fx-text-fill: red");
        });


        Scene scene = new Scene(masterPane);
        primaryStage.setTitle("Chapter 16, Question 04");
        primaryStage.setScene(scene);
        primaryStage.show();

    }
}

Did you read the exception being thrown (IllegalAccessError)? That should be your first stop. Also, please copy/paste the exception into the question instead of linking to an image. — Zephyr
– Zephyr, Commented Mar 13, 2019 at 19:45
Note that this is the stacktrace of a single exception. This exception (InvocationTargetException) has a cause (RuntimeException) which in turn has it's own cause (IllegalAccessError). Usually the last Caused by part is the interesting one, since it contains the "root cause". If you put the application in a module with the appropriate requires, the problem should go away... — fabian
– fabian, Commented Mar 13, 2019 at 21:26
The entire line of the Illegal Access Error is: Caused by: java.lang.IllegalAccessError: superclass access check failed: class com.sun.javafx.scene.control.ControlHelper (in unnamed module @0xf42c050) cannot access class com.sun.javafx.scene.layout.RegionHelper (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.scene.layout to unnamed module @0xf42c050 I just realized my screenshot cut it off. — Chester Taylor
– Chester Taylor, Commented Mar 13, 2019 at 23:15
FIX: I fixed the issue by adding the below to the VM options. I was under the impression if you added it to the Main application you didn't need to add it to the others, which is evidently wrong. --module-path "C:\Program Files\Java\javafx-sdk-11.0.2\lib" --add-modules=javafx.controls,javafx.fxml,javafx.graphics,javafx.base — Chester Taylor
– Chester Taylor, Commented Mar 13, 2019 at 23:38

trilogy · Accepted Answer · 2019-03-13 19:48:54Z

0

You need to set the values for the TextFields before you can use them to instantiate BigDecimal objects.

 milesTF.setText("0.00");
 kiloTF.setText("0.00");

 BigDecimal milesInput = new BigDecimal(milesTF.getText());
 BigDecimal kiloInput = new BigDecimal(kiloTF.getText());

answered Mar 13, 2019 at 19:48

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1 Comment

fabian Over a year ago

This indeed is a flaw in the program, but in this case not the root cause of the issue. Arguably the input should be read in a event handler or a listener though. This doesn't fix the error the OP posted the stacktrace for though...

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