<h:form id="form">
       <p:poll interval="3" update="votes" autoStart="true"/>
       <p:chart id="votes" type="bar" model="#{chartView.barModel}"
                                           style="width:400px;height:300px"/>
</h:form>

@SessionScoped
@ManagedBean
public class ChartView implements Serializable {

    private BarChartModel barModel;

    @PostConstruct
    public void init() {
        createBarModels();
    }
    public BarChartModel getBarModel() {
        return barModel;
    }

    private BarChartModel initBarModel() {
        BarChartModel model = new BarChartModel();

        ChartSeries boys = new ChartSeries();
        boys.setLabel("Boys");
        int random1 = (int)(Math.random() * 200);
        int random2 = (int)(Math.random() * 200);
        int random3 = (int)(Math.random() * 200);
        boys.set("2004", random1);
        boys.set("2005", random2);
        boys.set("2006", random1);
        boys.set("2007", random2);
        boys.set("2008", random3);

        model.addSeries(boys);

        return model;
    }

    private void createBarModels() {
        createBarModel();
    }

    private void createBarModel() {
        barModel = initBarModel();

        barModel.setTitle("Bar Chart");
        barModel.setLegendPosition("ne");

        Axis xAxis = barModel.getAxis(AxisType.X);
        xAxis.setLabel("Gender");

        Axis yAxis = barModel.getAxis(AxisType.Y);
        yAxis.setLabel("Births");
        yAxis.setMin(0);
        yAxis.setMax(200);
    }
}