Method showErrorAlert

src/main/java/com/codedead/opal/utils/FxUtils.java:67–83

Show an error message to the user @param header The content of the header @param content The content of the error message @param imageStream The InputStream object that contains the image for the Alert object

(final String header, final String content, final InputStream imageStream)

     * @param imageStream The {@link InputStream} object that contains the image for the {@link Alert} object
     */
    public static void showErrorAlert(final String header, final String content, final InputStream imageStream) {
        if (header == null)
            throw new NullPointerException("Header cannot be null!");
        if (content == null)
            throw new NullPointerException("Content cannot be null!");

        final Alert alert = getErrorAlert(content);
        alert.setHeaderText(header);

        final Stage stage = (Stage) alert.getDialogPane().getScene().getWindow();

        if (imageStream != null) {
            stage.getIcons().add(new Image(imageStream));
        }

        alert.showAndWait();
    }

    /**
     * Generate a new error {@link Alert} object