create chart using ireport

[prriya pratheep]

I need to create a chart through java i am creating report. Need to generate chart for monthly sales and cost.I use array list for cost , sales ,actual_cost and actual_sales and month and pass this array list through map.My map already has some other values.

My java code

Map parameters = new HashMap(); 
List<CostSales> listOfCostSales = new ArrayList<CostSales>(); 

listOfCostSales.add(new CostSales(actual_Cost, actual_Sale,cost,sale1,monthKey)); 

parameters.put("listOfCostSales", listOfCostSales); 

jasperPrint = JasperFillManager.fillReport(jasperReport,parameters,dataSource); 

<parameter name="listOfCostSales" isForPrompting="false" class="java.util.List"/> 

My jrxml file

<lineChart> 
<chart hyperlinkTarget="Self" > 
<reportElement 
x="141" 
y="259" 
width="429" 
height="208" 
key="element-1"/> 
<box topBorder="None" topBorderColor="#000000" leftBorder="None" leftBorderColor="#000000" rightBorder="None" rightBorderColor="#000000" bottomBorder="None" bottomBorderColor="#000000"/> 
<chartLegend textColor="#000000" backgroundColor="#FFFFFF" > 
</chartLegend> 
</chart> 
<categoryDataset> 
<dataset > 
<datasetRun subDataset="ChartDataset"> 
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($P{listOfCostSales})]]></dataSourceExpression> 
</datasetRun> 
</dataset> 
</categoryDataset> 
<linePlot > 
<plot /> 
<categoryAxisLabelExpression><![CDATA[$P{month}]]></categoryAxisLabelExpression> 
<categoryAxisFormat> 
<axisFormat > 
</axisFormat> 
</categoryAxisFormat> 
<valueAxisFormat> 
<axisFormat > 
</axisFormat> 
</valueAxisFormat> 
</linePlot> 
</lineChart> 

where ChartDataset is my subreport have parameters Actual_cost ,Actual_sale,Sale,Cost and month which I want to use in my XY chart where month is in x axis and Others as values.

How can i retrieve these values in my chart. when i try to run with $P{REPORT_PARAMETERS_MAP}.get( "Actual_Cost" ) I am getting empty key . I try to print in text box nothing is getting.

Can you please help me to get values. I am new to ireport and last one week i am trying this.

Thanks