// for base types use default exporter, mimeType and parameters if these 
      // are not specified by configuration file 
      if (outputType.equalsIgnoreCase("csv")) {
        if(mimeType == null) mimeType = "text/plain";
        servletResponse.setContentType(mimeType);
        if(exporter == null) exporter = new JRCsvExporter();
      } else if (outputType.equalsIgnoreCase("html")) {
        if(mimeType == null) mimeType = "text/html";
        servletResponse.setContentType(mimeType);
        if(exporter == null) exporter = new JRHtmlExporter();
        exporter.setParameter(JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN, Boolean.FALSE);