Hi I have created a HTML form to upload multiple files through a servlet. I am using Tomcat 3.2 version and I have placed the commons-fileupload-1.2.1.jar and commons-io-1.4.jar in C:\Tomcat\lib directory. The servlet compiles but at run time generate exception of java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletReques. I also copied the whole lib folder and put it into C:\Tomcat\webapps\root\web-inf folder but still the same status. I am totally stuck here.
HTML Code from where I am accessing the servlet is 
<form action="/servlet/FileUploadDemoServlet" method="post" enctype="multipart/form-data">

I have placed the servlet in C:\Tomcat\webapps\root\web-inf\classes folder.
Servlet code is as follows:
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.*;
import java.util.*;
import java.io.IOException;
import java.io.File;
import java.util.List;
import java.util.Iterator;
 
public class FileUploadDemoServlet extends HttpServlet {
    private static final long serialVersionUID = -3208409086358916855L;
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
 
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
 
        if (isMultipart) {
            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
 
            try {
                List items = upload.parseRequest(request);
                Iterator iterator = items.iterator();
                while (iterator.hasNext()) {
                    FileItem item = (FileItem) iterator.next();
 
                    if (!item.isFormField()) {
                        String fileName = item.getName();
 
                        String root = getServletContext().getRealPath("/");
                        File path = new File(root + "check/uploads");
                        if (!path.exists()) {
                            boolean status = path.mkdirs();
                        }
 
                        File uploadedFile = new File(path + "/" + fileName);
                        System.out.println(uploadedFile.getAbsolutePath());
                        item.write(uploadedFile);
                    }
                }
            } catch (FileUploadException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
Any help in this regard please.