JasperFillManager.fillReport using JRResultSetDataSource returns 'Connection object is null' when the report contains a table

[NOjeil]

When trying to execute a report containing a jr:table using JasperFillManager.fillReport(JasperReport jasperReport, Map<String, Object> parameters, JRDataSource dataSource)
where the dataSource is : JRResultSetDataSource rsDs=new JRResultSetDataSource(rs); new JRResultSetDataSource(rs) ,i get the following error
             net.sf.jasperreports.engine.query.JRJdbcQueryExecuter <init>
             WARNING: The supplied java.sql.Connection object is null.
Note that this error does not appear in case of a free form report, it is only appear if we have a jr:table
below is my piece of code :
            String sql="select ... from... where...";
            ResultSet rs = stmt.executeQuery(sql);
            JRResultSetDataSource rsDs=new JRResultSetDataSource(rs);
            jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, rsDs);

Please can anyone help ?