code error.please help.urgent!!!!!

I am uploading a file.but i get an error.please correct the code. i get an error where check2 is not being printed.plz correct

package sercls; import java.lang.Class; import java.lang.String; import java.lang.Exception;

import java.io.PrintWriter; import java.io.IOException; import java.io.BufferedReader; import java.io.InputStreamReader;

import java.sql.Types; import java.sql.ResultSet; import java.sql.Statement; import java.sql.Connection; import java.sql.DriverManager;

import java.util.List; import java.util.Iterator;

import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpSession; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.DiskFileUpload; import org.apache.commons.fileupload.FileUploadException;

public class saveserv extends HttpServlet {

@Override protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { Connection connection = null; Statement statement = null;

    String driver = null;
    String url    = null;
    String userid = null;
    String pass   = null;

    String query  = null;

    String  error_message = null;
    boolean error_occured = false;

    boolean tableCreated = false;

    DiskFileUpload upload   = null;
    BufferedReader queries  = null;
           List items = null;

    HttpSession session   = req.getSession(false);

        driver  = session.getAttribute("driver").toString();
        url     = session.getAttribute("url").toString();
        userid  = session.getAttribute("userid").toString();
        pass    = session.getAttribute("pass").toString();

        PrintWriter out=res.getWriter();

        out.println("sdfsfd");

            out.println(driver+url);
        try {
         out.println("check");
                        upload = new DiskFileUpload();
                        out.println("check1"+upload+"***************"+items);
            items  = upload.parseRequest(req);
                    out.println("check2");
            Iterator iter = items.iterator();
                            out.println("items--------"+items);
            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();
                if(!item.isFormField()) {
                    queries = new BufferedReader(new InputStreamReader(item.getInputStream()));
                                            out.println("queries----------"+queries);
                }
            }
        }
        catch(Exception e)  {
            error_occured = true;
            error_message = e.toString();

        }
             /*if(!error_occured)   {
            try {
                Class.forName(driver);
                connection  = DriverManager.getConnection(url,userid,pass);
                statement   = connection.createStatement();
            }
            catch(Exception e) {
                error_occured = true;
                error_message = e.toString();
            }
        }
         if(error_occured)
             res.sendRedirect("error occured");
        else {
            try {
                while(true) {
                    query = queries.readLine();
                    if(query == null)   break;
                    else {
                        statement.execute(query);
                        if(query.toUpperCase().startsWith("CREATE")) tableCreated = true;
                    }
                }
            }
            catch(Exception e) {
                error_occured = true;
                error_message = e.toString();
            }
        }

*/ out.println("checkfinal"); }

}