Apache poi is generating empty excel

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Java

MySQL

Spring

i want to export data to excel file from jsp page by using spring mvc application with hibernate bt when i run the application it generates excel file with headers only.
I am writing the code :

QueryListExcelView.java--------->

package com.rec.excelUtil;

import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.servlet.view.document.AbstractXlsView;
import org.springframework.web.servlet.view.document.AbstractXlsxView;

import com.rec.model.Admin;
import com.rec.model.Discom;
import com.rec.model.StateDiscom;

public class QueryListExcelView extends AbstractXlsxView {
	private static Logger log= Logger.getLogger(QueryListExcelView.class);
	

	@Override
	protected void buildExcelDocument(Map<String, Object> model, Workbook workbook, HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		try
		{
		response.setHeader("Content-Disposition", "attachment; filename=\"queryTracking.xlsx\"");

		List<Discom> AdminPanel = (List<Discom>) model.get("AdminPanel");
		 Sheet sheet = workbook.createSheet("QueryTracking Report");
		 Row header = sheet.createRow(0);
		 header.createCell(0).setCellValue("userId");
		 header.createCell(1).setCellValue("Name of the State");
		 header.createCell(2).setCellValue("Name of the Discom");
		 header.createCell(3).setCellValue("Employee Name");
		 header.createCell(4).setCellValue("Query No");
		 header.createCell(5).setCellValue("Facility Name");
		 header.createCell(6).setCellValue("Description");
		 header.createCell(7).setCellValue("Query Registered on");
		 header.createCell(8).setCellValue("Status");
		 header.createCell(9).setCellValue("QUERY COMPLIANCE DATE");
		 header.createCell(10).setCellValue("Remarks");
		 int row_count=1;
		 for(Discom records:AdminPanel)
		 {
			 log.info("records are: Id:\n"+records.getUserId()+"Discom name: \n"+records.getDiscomName());
			 Row datarow = sheet.createRow(row_count++);
			 datarow.createCell(0).setCellValue(records.getUserId());
			 datarow.createCell(1).setCellValue(records.getState());
			 datarow.createCell(2).setCellValue(records.getDiscomName());
			 datarow.createCell(3).setCellValue(records.getUsername());
			 datarow.createCell(4).setCellValue(records.getQueryNo());
			 datarow.createCell(5).setCellValue(records.getFacility());
			 datarow.createCell(6).setCellValue(records.getQueryDescription());
			 datarow.createCell(7).setCellValue(records.getQueryRegistered());
			 datarow.createCell(8).setCellValue(records.getAdmin().getStatus());
			 datarow.createCell(9).setCellValue(records.getAdmin().getQueryComplianceDate());
			 datarow.createCell(10).setCellValue(records.getAdmin().getRemarks());
			 
			 
		 }
		 
		}
		catch (Exception e) {
			log.info(e);
			e.printStackTrace();
			e.getMessage();
			// TODO: handle exception
		}
		 
		
		
		
		
		
		
		
		
		
		
	}

}

ExcelPdfController-------->
package com.rec.controller;

import java.util.List;

import org.apache.log4j.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.rec.dao.Admin_DiscomDao;
import com.rec.service.Admin_DiscomService;

@Controller
public class ExcelPdfController {
	
	@Autowired
	SessionFactory sf;
	
	
	@Autowired
	Admin_DiscomService adminDiscomService;
	
	private static Logger logger = Logger.getLogger(ExcelPdfController.class);
	
	@RequestMapping(value = "/excel",method = RequestMethod.GET)
	public ModelAndView generateExcel() throws Exception
	{
	
		logger.info("******************Generate Excel**********************"); 
		
			Session session= sf.openSession();
			List<Object[]> queryData = adminDiscomService.searchAll();
			
		
		
		return new ModelAndView("QueryExcelView","AdminPanel",queryData);
		
	
	}

}

it generates the folowing exceptions:

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.rec.model.Discom
	at com.rec.excelUtil.QueryListExcelView.buildExcelDocument(QueryListExcelView.java:46)

What I have tried:

I have tried it by extending AbstractXlsViewer class.