FXML: fx:include / with resources attribute. How does it work?

Question

Hi,
I am trying to understand FXML and I have trouble with using ResourceBundles / internationalization.
I've made a common component, which relies on its own resource file, let's say in package "fxml", I have:
Control.fxml
Control.properties
Control_de.properties
Another FXML includes that one:
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<fx:root type="javafx.scene.layout.VBox" xmlns:fx="http://javafx.com/fxml">
    <TextField fx:id="textField"/>
    <fx:include source="/fxml/Control.fxml" resources="fxml.Control" />
</fx:root>
If I load that one via:
Parent loginView = FXMLLoader.load(getClass().getResource("/fxml/Login.fxml"), ResourceBundle.getBundle("fxml.Login"));
I get the following exception:
Caused by: java.lang.NullPointerException
    at java.util.ResourceBundle.getBundle(ResourceBundle.java:1026)
    at javafx.fxml.FXMLLoader$IncludeElement.processAttribute(FXMLLoader.java:897)
    at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:180)
    at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:563)
    at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2348)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2164)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2061)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2778)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2757)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2743)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2730)
    at fxml.JavaFXApp.start(JavaFXApp.java:19)
What's wrong here? fxml.Control.properties definitively exists.
If I remove the <fx:include/> element, everything works fine.
Is there a possibility to include resources directly in a FXML, so that I don't have to specify them again and again in every include?

Answer 1

Would the non-static FXMLLoader#load method work for you?
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation(controller.getClass().getResource("/fxml/Login.fxml"));
// Attempt to load resources if they exist
try {
  ResourceBundle resourceBundle = ResourceBundle.getBundle("fxml.Login");
  fxmlLoader.setResources(resourceBundle);
catch (MissingResourceException e) {
  // TODO Log information about the missing bundle
fxmlLoader.load();