The FXML loader assigns the fx:id element from the .fxml file only when the @IDProperty annotation is given on the class.
This is not the case for TableColumnBase which defines
{code}
 private StringProperty id;
{code}
But is not annotated with the @IDProperty annotation.

In the Scenebuilder I can give the TableColumn's of a TableView an fx:id which I will not be able to read again from the loaded TableColumn.

https://javafx-jira.kenai.com/browse/RT-17657 <-- base task that changed the behaviour to reading the id based on the annotation.


{code}
public class TableColumnIdTest {
  private ExecutorService executorService;

  public static class TestApp extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {

    }
  }

  @Before
  public void setUp() throws Exception {
    executorService = Executors.newSingleThreadExecutor();
    executorService.submit(() -> Application.launch(TestApp.class));
  }

  @After
  public void tearDown() throws Exception {
    Platform.exit();
    executorService.shutdownNow();
  }

  @Test
  public void testName() throws Exception {
    URL url = TableColumnIdTest.class.getResource("TableColumnIdTest.fxml");
    StackPane pane = FXMLLoader.load(url);
    TableView tableView = (TableView) pane.getChildren().get(0);
    TableColumn column = (TableColumn) tableView.getColumns().get(0);
    assertNotNull("Table column id should be set to \"" + readColumnIdFromUrl(url) + "\"", column.getId());
  }

  private String readColumnIdFromUrl(URL url) throws URISyntaxException {
    try (FileInputStream stream = new FileInputStream(new File(url.toURI()))) {
      LineNumberReader reader = new LineNumberReader(new InputStreamReader(stream));
      for (String line = reader.readLine(); line != null; line = reader.readLine()) {
        String lookup = "fx:id=\"";
        int index = line.indexOf(lookup);
        if (index > 0) {
          int start = index + lookup.length();
          return line.substring(start, start + 6);
        }
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

    return null;
  }
}
{code}

{code}
<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<StackPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<children><TableView prefHeight="200.0" prefWidth="200.0">
  <columns>
    <TableColumn fx:id="myId42" prefWidth="599.0" text="C1" />
  </columns>
</TableView>
</children></StackPane>
{code}