Exception in thread "main" java.lang.NullPointerException

package scon;

import java.awt.List;
import java.io.File;

import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.util.FileManager;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.ArrayList;

import javax.servlet.*;
import javax.servlet.http.*;

public class show {

	/**
	 * @param args
	 */
	public static final String MY_FOAF_FILE = "//home/ubuntu/indoor.rdf";
	public static HttpServletResponse response;
    public static HttpServletRequest request;
	public static void main(String[] args) {
		
	    
	    
		Model model = ModelFactory.createDefaultModel();
	       FileManager.get().readModel(model,MY_FOAF_FILE);
	       model.read(new File(MY_FOAF_FILE).toURI().toString());
	       String queryString =  "SELECT ?predicate ?object   WHERE {?subject ?predicate ?object .}";  
		
	       com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString);
        QueryExecution qe = QueryExecutionFactory.create(query, model);

        com.hp.hpl.jena.query.ResultSet results = qe.execSelect();
        ResultSetFormatter.out(System.out, results);
        response.setContentType("text/html");		
        ArrayList<rowobject> resultss = new ArrayList<rowobject>();

                while ( results.hasNext()) {
                    RowObject result = new RowObject();
                    QuerySolution binding = results.nextSolution();
                    result.setName(binding.get("door"));
                    result.setSymbol(binding.get("window"));
                    result.setNumber(binding.get("wind"));
                    // ...
                    resultss.add(result);

                }
                
                
                request.setAttribute("resultss", resultss); // Will be available as ${results} in JSP
                try {
					request.getRequestDispatcher("/wow.jsp").forward(request, response);
				} catch (ServletException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
    }
    



	}