how get datasource object in sun java studio creater

[muhammad fahim]

sir how i get datasource object for passing to ireport for calling jrxml report

i use this code


Context ctx = null;
DataSource ds = null;
try {
ctx = new InitialContext();
ds = (DataSource) ctx.lookup("jdbc/as400");
} catch (NamingException ex) {
ex.printStackTrace();
}

Connection conn = ds.getConnection();

ServletOutputStream ouputStream = response.getOutputStream();
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport, parameters, conn);



but this line give me error

Context ctx = null;
ctx = new InitialContext();

} catch (NamingException ex) {

ServletOutputStream ouputStream = response.getOutputStream();
JasperPrint jasperPrint = JasperManager.fillReport(jasperReport, parameters, conn);


please give me idea how i call ireport

thank's

aamir