Re: [jCharts-users] NullPointerException at XAxis.render(XAxis.java:406)

[Nathaniel G. A. <nat...@ya...>]

The problem you are having is that you are passing a DataAxisProperties Object for the y-axis
properties when this should be a LabelAxisProperties Object.


try this for your xAxisProperties:

LabelAxisProperties xAxisProperties = new LabelAxisProperties();




--- Marcin Gryszkalis <da...@to...> wrote:
> Hi, I use jCharts 0.7.3
> 
> I get this:
> 23:40:56,045 ERROR [STDERR] java.lang.NullPointerException
> 23:40:56,055 ERROR [STDERR]     at org.jCharts.axisChart.axis.XAxis.render(XAxis.java:406)
> 23:40:56,055 ERROR [STDERR]     at
> org.jCharts.axisChart.AxisChart.renderChart(AxisChart.java:442)
> 23:40:56,055 ERROR [STDERR]     at org.jCharts.Chart.render(Chart.java:169)
> 23:40:56,055 ERROR [STDERR]     at
> org.jCharts.encoders.BinaryEncoderUtil.render(BinaryEncoderUtil.java:90)
> 23:40:56,065 ERROR [STDERR]     at org.jCharts.encoders.PNGEncoder.encode(PNGEncoder.java:91)
> 23:40:56,085 ERROR [STDERR]     at extranet.ChartServlet.performTask(ChartServlet.java:341)
> 
> The code from my ChartServlet that generates the chart is below,
> What I am doing wrong?
> regards
> Marcin
> 
> ===============
> String[] xAxisLabels= { "I","II","III","IV","V","VI","VII","VIII","IX","X","XI","XII" };
> out = response.getOutputStream();
> 
> java.util.ResourceBundle txts = java.util.ResourceBundle.getBundle("charts",new
> Locale(language));
> 
> String year  = getParameter(request,"Year");
> if (year == null) year="2002";
> 
> Collection v = user.getNumbersByYear(kid, new Long(year));
> Iterator it = v.iterator();
> 
> double[][] data = new double[1][12];
> for (int i=0; i<12; i++)
> {
> 	double d = ((Long)it.next()).doubleValue();
> 	data[0][i] = d;
> }
> String xAxisTitle = fix(txts.getString("CHART1_XAXIS"));
> String yAxisTitle = fix(txts.getString("CHART1_YAXIS"));
> 
> Object[] arg = { year };
> String title = fix(MessageFormat.format(txts.getString("CHART1_TITLE"), arg));
> 
> DataSeries dataSeries = new DataSeries( xAxisLabels, xAxisTitle, yAxisTitle, title );
> 
> String[] legendLabels = { fix(txts.getString("CHART1_LEGEND")) };
> 
> Paint[] paints={ new GradientPaint(0,0,new Color(255,213,83,150),0,350,new Color(243,116,0,200))
> };
> BarChartProperties barChartProperties = new BarChartProperties();
> 
> ValueLabelRenderer valueLabelRenderer = new ValueLabelRenderer( false, false, false, -1 );
> valueLabelRenderer.setValueLabelPosition( ValueLabelPosition.ON_TOP );
> valueLabelRenderer.useVerticalLabels(false);
> barChartProperties.addPostRenderEventListener( valueLabelRenderer );
> 
> AxisChartDataSet axisChartDataSet = new AxisChartDataSet(data, legendLabels, paints,
> ChartType.BAR, barChartProperties);
> dataSeries.addIAxisPlotDataSet(axisChartDataSet);
> ChartProperties chartProperties = new ChartProperties();
> 
> DataAxisProperties xAxisProperties = new DataAxisProperties();
> xAxisProperties.setAxisTitleChartFont(ft_axis);
> xAxisProperties.setScaleChartFont(ft_labels);
> 
> DataAxisProperties yAxisProperties = new DataAxisProperties();
> yAxisProperties.setAxisTitleChartFont(ft_axis);
> yAxisProperties.setScaleChartFont(ft_labels);
> yAxisProperties.setRoundToNearest(0);
> 
> AxisProperties axisProperties = new AxisProperties(xAxisProperties, yAxisProperties);
> LegendProperties legendProperties = new LegendProperties();
> 
> chartProperties.setTitleFont(ft_title);
> legendProperties.setFont(ft_base_);
> 
> axisProperties.setBackgroundPaint(new GradientPaint(0,0,new Color(255,255,255),0,300,new
> Color(167,213,255)));
> AxisChart axisChart= new AxisChart(
> dataSeries,
> chartProperties,
> axisProperties,
> null, //legendProperties,
> 548, 350 ); // wymiary wykresu
> 
> response.setContentType("image/png");
> PNGEncoder.encode(axisChart, out);
> 
> 
> 
> 
> 
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=====
http://nathaniel-auvil.blog-city.com/

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