public static JRBaseFiller createFiller(JasperReport jasperReport) throws JRException 
{
		JRBaseFiller filler = null;
		switch (jasperReport.getPrintOrder())
		{
			case JRReport.PRINT_ORDER_HORIZONTAL :
			{
				filler = new JRHorizontalFiller(jasperReport);
				break;
			}
			case JRReport.PRINT_ORDER_VERTICAL :
			{
				filler = new JRVerticalFiller(jasperReport);
				break;
			}
		}
		return filler;
}

 public static JasperPrint fillReport(JasperReport jasperReport,
    Map parameters) throws JRException 
{
		JRBaseFiller filler = createFiller(jasperReport);
		try
		{
			JasperPrint jasperPrint = filler.fill(parameters);
			return jasperPrint;
		}
		catch (JRFillInterruptedException e)
		{
			throw new JRException("The report filling thread was interrupted.");
		}
}

Fills a report.

The data source used to fill the report is determined in the following way:

• If a non-null value of the REPORT_DATA_SOURCE has been specified, it will be used as data source.
• Otherwise, if the report has a query then a data source will be created based on the query and connection parameter values.
• Otherwise, the report will be filled without a data source.

 public static JasperPrint fillReport(JasperReport jasperReport,
    Map parameters,
    Connection conn) throws JRException 
{
		JRBaseFiller filler = createFiller(jasperReport);
		JasperPrint jasperPrint = null;
		try
		{
			jasperPrint = filler.fill(parameters, conn);
		}
		catch(JRFillInterruptedException e)
		{
			throw new JRException("The report filling thread was interrupted.");
		}
		return jasperPrint;
}

 public static JasperPrint fillReport(JasperReport jasperReport,
    Map parameters,
    JRDataSource dataSource) throws JRException 
{
		JRBaseFiller filler = createFiller(jasperReport);
		JasperPrint jasperPrint = null;
		try
		{
			jasperPrint = filler.fill(parameters, dataSource);
		}
		catch(JRFillInterruptedException e)
		{
			throw new JRException("The report filling thread was interrupted.");
		}
		return jasperPrint;
}