[news.eclipse.birt] How to set chart data dyamically in birt

[swetyy@xxxxxxxxx (swety)]

I am using chart on report 

LineSeries ls1 = (LineSeries) LineSeriesImpl.create( );
		ls1.getDataDefinition().add(QueryImpl.create("row[\"JobID\"]"));
	
if i do like this then it throws error
The data definition for the category series was unspecified.

but showing records from same data set on report