importPackage(Packages.org.eclipse.birt.report.engine.api);

rptdoc = reportContext.getReportRunnable().getReportName();


// Open the rptDocument
  reportDocument = getReportEngine().openReportDocument(rptdoc);

  // Create the render task, configured for the wanted export format
 IRenderTask renderTask = getReportEngine().createRenderTask(reportDocument);

  IRenderOption options = new RenderOption();
  options.setOutputFormat("pdf");
  options.setOutputFileName("C:/test/myfile.pdf");
  renderTask.setRenderOption(options);

 // Launch the render task and close it 
    renderTask.render();
    renderTask.close();

    // Close the rptDocument
    reportDocument.close();