jcharts-users

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

[Marcin G. <da...@to...>]

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);

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

[Marcin G. <da...@to...>]

On 2003-06-26 04:28, Nathaniel G. Auvil wrote:

> 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();

but, DataAxisProperies directly extends LabelAxisProperties...
Anyway, the code is:

DataAxisProperties yAxisProperties = new DataAxisProperties();
yAxisProperties.setAxisTitleChartFont(ft_axis);
yAxisProperties.setScaleChartFont(ft_labels);
yAxisProperties.setRoundToNearest(0);
AxisProperties axisProperties = new AxisProperties(xAxisProperties, yAxisProperties);

if I change it do LabelAxisProperties, how can I
access 'round-to-nearest' property (which is defined in DataAxisProperties)?

regards
Marcin

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

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

--- Marcin Gryszkalis <da...@to...> wrote:
> On 2003-06-26 04:28, Nathaniel G. Auvil wrote:
> 
> > 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();
> 
> but, DataAxisProperies directly extends LabelAxisProperties...

Yeah, but the logic uses the type of AxisProperties in determining how to draw the Axis.


> if I change it do LabelAxisProperties, how can I
> access 'round-to-nearest' property (which is defined in DataAxisProperties)?

Your data is plotted against the y-axis so you would place your rounding code there. The labels
are on the x-axis so rounding does not apply there.



=====
http://nathaniel-auvil.blog-city.com/

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

[Marcin G. <da...@to...>]

Ok, now I understand

You wrote:
>>>The problem you are having is that you are 
 >>>passing a DataAxisProperties Object for the y-axis
                                                ^^^^^^
That's why I didn't understand, should be x-axis, right?

regards
Marcin