problème exporter excel spring

bonsoir ;
voici mon code:

ma classe ExcelBuilder :

Code:

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package dz.algerietelecom.portallte.mvc;
 
import java.util.List;
import java.util.Map;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.springframework.web.servlet.view.document.AbstractExcelView;
 
import dz.algerietelecom.portallte.domain.SummaryModel;
 
 
 
public class ExcelBuilder extends AbstractExcelView {
 
	@Override
	protected void buildExcelDocument(Map<String, Object> model,
			HSSFWorkbook workbook, HttpServletRequest request, HttpServletResponse response)
			throws Exception {
System.out.println("gggggggggggggggggggggggggg");
 
  List<SummaryModel> resultat = (List<SummaryModel>) model.get("summary_resultat");
  HSSFSheet sheet = workbook.createSheet("Employee Report");
  sheet.setDefaultColumnWidth(30);
 
 CellStyle style = workbook.createCellStyle();
 Font font = workbook.createFont();
 font.setFontName("Arial");
 style.setFillForegroundColor(HSSFColor.BLUE.index);
 style.setFillPattern(CellStyle.SOLID_FOREGROUND);
 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
 font.setColor(HSSFColor.WHITE.index);
 style.setFont(font);
 
  HSSFRow header = sheet.createRow(0);
  header.createCell(0).setCellValue("Pays Départ");
  header.createCell(1).setCellValue("pays Destination");
  header.createCell(2).setCellValue("Opérateur");
  header.createCell(3).setCellValue("Appel");
  header.createCell(3).setCellValue("Trafic");
  header.createCell(3).setCellValue("Nature trafic");
  header.createCell(3).setCellValue("Date");
  header.createCell(3).setCellValue("Durée");
 
  int counter = 1;
  for (SummaryModel e : resultat) {
   HSSFRow row = sheet.createRow(counter++);
   row.createCell(0).setCellValue(e.getOriginal());
  }
 
 
 }
}

l appel de la classe:

Code:

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@RequestMapping(value = "/downloadExcel", method = RequestMethod.GET)
	public ModelAndView downloadExcel() {
    	System.out.println("Calling generateExcel()...");
 
 
 
        ModelAndView modelAndView = new ModelAndView("excelView", "summary_resultat",result);
        System.out.println("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
        return modelAndView;
	}

j'aurais toujours cette erreur:

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 "excelView", template might not exist or might not be accessible by any of the configured Template Resolvers