Programmiererforum

Ich teste ControlSFX GridView, aber ich erhalte nullpointerexception und kann keine Möglichkeit finden, es zu beheben.
org.controlsfx
controlsfx
11.1.1

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Code: < /p>
public class NewMain extends Application {

@Override
public void start(Stage primaryStage) {
ObservableList data = FXCollections.observableArrayList(
List.of("Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 6", "Item 7", "Item 8"));

GridView gridView = new GridView(data);

gridView.setCellFactory(new Callback() {
@Override
public GridCell call(GridView arg0) {
return new GridCell() {
@Override
protected void updateItem(String item, boolean empty) {
super.updateItem(item, empty);
if (empty || item == null) {
setText(null);
} else {
setText(item);
}
}
};
}
});

Scene scene = new Scene(gridView, 600, 400);
primaryStage.setScene(scene);
primaryStage.show();
}

public static void main(String[] args) {
launch(args);
}
}
< /code>
Ergebnis: < /p>
Caused by: java.lang.NullPointerException: Cannot invoke "javafx.scene.control.IndexedCell.updateIndex(int)" because "" is null
at javafx.controls@21/javafx.scene.control.skin.VirtualFlow.setCellIndex(VirtualFlow.java:1812)
at javafx.controls@21/javafx.scene.control.skin.VirtualFlow.getCell(VirtualFlow.java:1796)
at javafx.controls@21/javafx.scene.control.skin.VirtualFlow.getOrCreateCellSize(VirtualFlow.java:3068)
at javafx.controls@21/
...

< /code>
Könnte jemand sagen, wie man es behebt? Jede Hilfe wird sehr geschätzt.