JavaFX XYChart warnings

Question

Lets take this small example, what are those warnings / what am i doing wrong here?

Raw use of parameterized class 'XYChart.Data'
Unchecked assignment: 'javafx.scene.chart.XYChart.Data' to 'javafx.scene.chart.XYChart.Data<java.lang.String,java.lang.Number>'
Unchecked call to 'Data(X, Y)' as a member of raw type 'javafx.scene.chart.XYChart.Data'

This would be the code

private final XYChart.Series<String, Number> courseSeries = new XYChart.Series<>();
private final LinkedList<XYChart.Series<String, Number>> courseSeriesTimespan = new LinkedList<>();
@FXML
public BarChart<String, Number> course;

private void test(){
    courseSeriesTimespan.get(1).getData().add(new XYChart.Data("Jän", 1));
}

Answer 1

Use parameterized type

courseSeriesTimespan.get(1).getData().add(new XYChart.Data<String,Number>("Jän", 1));

Update. Or without specifying specific types

courseSeriesTimespan.get(1).getData().add(new XYChart.Data<>("Jän", 1));