Passing dataSource to subreport in ireport

[Roopali Gaikwad]

Hi,
I m using ireport for geneating my report which is having a subreport inside main report.
I m passing dataSource of type "JRBeanArrayDataSource" to main report and now i wanted to pass same datasource to subreport.
The way i tried to pass to subreport is

JRBeanArrayDataSource dataSource;
dataSource = new JRBeanArrayDataSource(mainreportData);
map.put("reportRows", dataSource);

and "reportRows" passed as parameter to subreport. But it didn't wrked.

Can anybody suggest how i can do this?

Thanks in advance.