DynamicJasper - subreport not displaying
private DynamicReport subReportTesting() throws Exception
{

      DynamicReportBuilder drb = new DynamicReportBuilder();
      DynamicReport dr = drb.addColumn(subAbstractColumn1)
            .addColumn(subAbstractColumn2)
            .addColumn(subAbstractColumn3)
            .setPrintColumnNames(true)
            .setIgnorePagination(true)
            .setMargins(0, 0, 0, 0)
            .setTitle("Sales Report")
            .setSubtitle("This report was generated at " + new Date())
            .setUseFullPageWidth(true)
            .build();

    return dr;

}

public DynamicReport buildReport() throws Exception {
{

     DynamicReportBuilder drb = new DynamicReportBuilder();
     drb.setTitle("This is original report")
        .setSubtitle("This is subtitle")
        .setMargins(15, 15, 15, 15)
        .setUseFullPageWidth(true);
        .setDetailHeight(30);
        .setAllowDetailSplit(true);
        .addColumn(mainAbstractColumn1);
        .addColumn(mainAbstractColumn2);
        .addColumn(mainAbstractColumn3);

     DynamicReport myDynamicReport = new DynamicReport();

        try {
            myDynamicReport = subReportTesting();
        } catch (Exception e) {
            e.printStackTrace();
        }

        SubReportBuilder srb = new SubReportBuilder();
        srb.setDynamicReport(myDynamicReport, new ClassicLayoutManager());

        try {
            mySubReport = srb.build();

            **drb.addConcatenatedReport(mySubReport);**

          } catch (DJBuilderException e) {
              e.printStackTrace();
          }
       DynamicReport myMainReport = drb.build();

       return myMainReport;
}