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create chart using ireport

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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

My jrxml file

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.

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