Null pointer Exception during image upload Using Servelts

[sugumarclick]

hi friends,
I am a novice java programmer.
I am in a learning process in java servlets.

But i struck into a uploading a file into (desired location) server
I will show my code as some one can point out where am i going wrong. Currently im dealing with null value exception and it also says ServletConfig needs to be initialized. Any one help me to get rid of that. Or suggest me a new (standard) method to solve it.
in doPost function

if(request.getParameter("action").toString()!=null){
            String action =request.getParameter("action").toString();
            if(action.equals("Upload")){
                ProjectUtility util =new  ProjectUtility ();
                util.uploadFile(request, response);
              
               System.out.print(request.getParameter("texte"));
             }
}

my ProjectUtility class

public void uploadFile(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	    

		DiskFileItemFactory  fileItemFactory = new DiskFileItemFactory ();
		/*
		 *Set the size threshold, above which content will be stored on disk.
		 */
		fileItemFactory.setSizeThreshold(1*1024*1024); //1 MB
		/*
		 * Set the temporary directory to store the uploaded files of size above threshold.
		 */
                 File tmpDir=new File("C:\\temp");
		fileItemFactory.setRepository(tmpDir);

		ServletFileUpload uploadHandler = new ServletFileUpload(fileItemFactory);
		try {
			/*
			 * Parse the request
			 */
                   
			List items = uploadHandler.parseRequest(request);
			Iterator itr = items.iterator();
			while(itr.hasNext()) {
				FileItem item = (FileItem) itr.next();
				/*
				 * Handle Form Fields.
				 */
				if(item.isFormField()) {
					
				} else {
					
					/*
					 * Write file to the ultimate location.
					 */
                                    File file = null;
                                    String destination = getServletContext(). getRealPath("/files/");

					 file = new File(destination,item.getName());
                                       
                                        item.write(file);
				}
				
			}
		}catch(FileUploadException ex) {
			ex.printStackTrace();
                        
		} catch(Exception ex) {
			ex.printStackTrace();
		}

	}

and im importing which doesnt cause me any issues

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

my HTML file

<%
out.println("<form name=\"uploadForm\" method=\"POST\" action=\"/Controller\" enctype=\"multipart/form-data\" >");

            out.println("<input type='text' name='texte' value=''>");
            out.println("<input type='file' name='fileImage'>");
            out.println("  <input type=\"submit\" name=\"action\" value=\"Upload\">");
	  %>

thanks & regards