JavaFX @FXML binding from within Java code

Question

I have a custom JavaFX component extending the Tab class:

public class MyTab extends Tab implements Initializable {
  @FXML private TextField myInput;
  private final MyDTO dto;

  public MyTab(MyDTO dto) { 
    super(); 
    this.dto = dto; 

    final FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/my-tab.xml"));
    fxmlLoader.setResources(MSG.getResourceBundle());
    fxmlLoader.setRoot(this);
    fxmlLoader.setController(this);
    try {
        fxmlLoader.load();
    }
    catch (IOException exception) {
        throw new RuntimeException(exception);
    }
  }

  @Override
  public void initialize(URL url, ResourceBundle res) {
    setText("My Tab");
    myInput.setText(dto.getValue());      // !!!
  }
}

With the FXML:

<fx:root type="javafx.scene.control.Tab" xmlns:fx="http://javafx.com/fxml">
<content>
  <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="180.0" prefWidth="200.0">
    <children>
      <Label id="myLabel" layoutX="14.0" layoutY="14.0" text="Text:" />
      <TextField id="myInput" layoutX="162.0" layoutY="10.0" prefHeight="25.0" prefWidth="300.0" />
    </children>
  </AnchorPane>
</content>
</fx:root>

I need to create this objects (custom tabs) dynamically from the java code:

final MyTab myTab = new MyTab(new MyDTO(...));
tabPane.getTabs().add(myTab);

When I use it like this, the @FXML binding doesn't work and the line

myInput.setText(dto.getValue());

throws NullPointerException. When the line with the setting of the text from the code is commented, the input is showned, so the problem is only in the binding.

I am using JavaFX 2 for Java 1.7

Thank you for any idea!

Your code as you posted it doesn't really make sense, because the FXML <MyTab> element would invoke a zero-argument constructor on MyTab, which doesn't exist. That said, it looks like it should work. Can you create and post an MCVE that produces the null pointer exception? — James_D
– James_D, Commented Aug 7, 2015 at 12:45
You're right, I put the contrustructor with the parameter as I left the pure FXML solution, I edited the question. — ttulka
– ttulka, Commented Aug 7, 2015 at 12:48

ttulka · Accepted Answer · 2015-08-07 12:50:59Z

1

Solution is very easy, I just overlooked the mistake in the FXML code:

Should be

<TextField fx:id="myInput" ...

instead of

<TextField id="myInput" ...

answered Aug 7, 2015 at 12:50

ttulka

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