Clearing the data of linechart series throws IndexOutOfBoundsException. Please see following example:

@Override
    public void start( final Stage stage )
    {
        stage.setTitle( "Line Chart Sample" );
        //defining the axes
        final NumberAxis xAxis = new NumberAxis();
        final NumberAxis yAxis = new NumberAxis();
        xAxis.setLabel( "Number of Month" );
        //creating the chart
        final LineChart<Number, Number> lineChart
                = new LineChart<Number, Number>( xAxis, yAxis );

        lineChart.setTitle( "Stock Monitoring, 2010" );
        //defining a series
        XYChart.Series series = new XYChart.Series();
        series.setName( "My portfolio" );
        //populating the series with data
        series.getData().add( new XYChart.Data( 1, 23 ) );
        series.getData().add( new XYChart.Data( 2, 14 ) );
        series.getData().add( new XYChart.Data( 3, 15 ) );
        series.getData().add( new XYChart.Data( 4, 24 ) );
        series.getData().add( new XYChart.Data( 5, 34 ) );
        series.getData().add( new XYChart.Data( 6, 36 ) );
        series.getData().add( new XYChart.Data( 7, 22 ) );
        series.getData().add( new XYChart.Data( 8, 45 ) );
        series.getData().add( new XYChart.Data( 9, 43 ) );
        series.getData().add( new XYChart.Data( 10, 17 ) );
        series.getData().add( new XYChart.Data( 11, 29 ) );
        series.getData().add( new XYChart.Data( 12, 25 ) );

        Button b = new Button( "clear" );
        b.setOnAction( new EventHandler<ActionEvent>()
        {
            @Override
            public void handle( ActionEvent event )
            {
                // lineChart.setAnimated( false);
                lineChart.getData().get( 0 ).getData().clear();
               // lineChart.setAnimated( true);
            }
        } );

        Scene scene = new Scene( new VBox( b, lineChart ), 800, 600 );
        lineChart.getData().add( series );

        stage.setScene( scene );
        stage.show();
    }



Related issue: RT-40632 but it was resolved as "Incomplete".
Related discussion: http://stackoverflow.com/questions/30395802/xychart-series-getdata-clear-throws-indexoutofboundsexception
Bug is on line:
XYChart.Data<X, Y> p2 = series.getItem( itemIndex + 1 );
of
LineChart.dataItemRemoved(...) method.