How is Vector <Vector> Receipt used as a JasperReports DataSource from Java?

I have a Vector receiptOrder and I want to print this receipt to a thermal printer using iReport

.

I am getting 3 classes:

• MyDataSource, which implements JRDataSource

• MyDataSourceProvider, which implements JRDataSourceProvider

• JRBasicField, which implements JRField

How can I set up a datasource JasperReports

with this vector?

• I did it.

  • upload jrxml
    
    file

    JasperDesign jasperDesign = JRXmlLoader.load ("c: /PrintReceipt.jrxml");
    JasperReport jr = JasperCompileManager.compileReport (jasperDesign);
    

  • pass orderRows
    
    which is from Vector<Vector>
    
    to MyDataSourceProvider
    
    , then createdatasource
    
    

    JRDataSourceProvider dsp = new MyDataSourceProvider (orderRows);
    JRDataSource dataSource = dsp.create (jr);
    JasperPrint jasperPrint = JasperFillManager.fillReport (jr, new HashMap (), dataSource);
    JasperExportManager.exportReportToPdfFile (jasperPrint, "c: /test.pdf");
    JasperViewer.viewReport (jasperPrint);
    

• but JasperReport shows me an empty view as well as test.pdf
  
  empty.

• any idea ...?