Java Programming

hi everybody,

my problem is how to pass a vector from one servlet to other .i saw the following logic in this forum and tried it our but iam getting erroes my code ids as follows

import java.sql.*;
import javax.servlet.*;
import java.io.*;
import javax.servlet.http.*;
import java.util.*;
import Conn.*;
public class FileRead extends HttpServlet
{
	public String isBlank(String str)
	{
		str=str==null?"":str;
		return str;
	}
	
	public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
	{
		PrintWriter out=response.getWriter();
		HttpSession session=request.getSession();	
		try
		{
			String path=request.getRealPath("/");
			String filename=request.getParameter("filename");
			FileInputStream fstream = new FileInputStream(path+filename+".txt");
			DataInputStream in = new DataInputStream(fstream);
			BufferedReader br = new BufferedReader(new InputStreamReader(in));
			String strLine="",strQuery="",strTemp="",strFileds="";
			int flag=0;
			Hashtable ht = new Hashtable();
			Vector<String> vecGetfields=new Vector<String>();
		
			while ((strLine = br.readLine())!=null)
			{
				if(strLine.indexOf("#")==0)
				{
					strTemp="";
					flag++;
				}
				else
				{
					strTemp=strTemp+strLine;
					ht.put("\""+flag+"\"",new String(strTemp));						
				}
			}

			if((ht.get("\""+0+"\"")!=null) && !(ht.get("\""+0+"\"").toString().equals("")))
			{
				strFileds=ht.get("\""+0+"\"").toString();
				StringTokenizer str=new StringTokenizer(strFileds,",");
				while(str.hasMoreTokens())
				{
					vecGetfields.add(str.nextToken());
					session.setAttribute("vecgetfields",vecGetfields);
				}
			}
			
			ht.clear();
			in.close();
		}
		catch (Exception e)
		{
			out.println("Error: " + e);
		}
	}
	public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
	{	
		PrintWriter out=response.getWriter();
		HttpSession session=request.getSession();			
		try
		{
			String path=request.getRealPath("/");
			String filename=request.getParameter("filename");
			//out.println("filename=="+filename);
			FileInputStream fstream = new FileInputStream(path+filename+".txt");
			DataInputStream in = new DataInputStream(fstream);
			BufferedReader br = new BufferedReader(new InputStreamReader(in));
			String strLine="",strQuery="",strTemp="",strFileds="";
			int flag=0;
			Hashtable ht = new Hashtable();
			DatabaseConnection db=new DatabaseConnection();
			ResultSet rs=null;	
			Vector vecFields=new Vector();
			Vector<String> vecGetfields=(Vector<String>)session.getAttribute("vecgetfields");
		}
		catch (Exception e)
		{
			out.println("Error: " + e);
		}
	}	
}

errors what iam getting at compilation are:

Vector cannot resolve symbol
String cannot resolve symbol



please any oune help me

thanks in advance