getting error as "sorry. No file uploaded" in stdout file in tomcat6/logs. i am able to insert and retrieve all details with images successfully. plz help me. using oracle 10g xe,apache 6.

my sql table is
Code:
SQL> desc product;
 Name                                      Null?    Type
 ----------------------------------------- -------- -----------------

 PRODUCT_DIV                               NOT NULL VARCHAR2(8)
 PRODUCT_NAME                              NOT NULL VARCHAR2(8)
 PRODUCT_ID                                NOT NULL NUMBER(8)
 PRODUCT_PHOTO                             NOT NULL BLOB
 PRODUCT_DES                               NOT NULL VARCHAR2(80)
my html code for accepting details is

Code:
<html>
<script src="insert.js" language="javascript">
</script>
<body>
<form name=f action='./update' method='post' onSubmit="return isValid(this)">
<table border=1 cellpadding =7 cellspacing=7 align=center>
<caption><i><font size=4><u>update records</caption>
<tr>
<th>product division <th><input type="number" name="product_div"></tr>
<tr>
<th>product name <th><input type="text" name="product_name"></tr>
<tr>
<th>product id <th><input type="number" name="product_id"></tr>
<tr>
<th>Select Photo <th><input type="file"  name="photo"/> </tr>
<tr>
<th>product description<th><input type="text" name="product_des"></tr>
<tr>
<th>click<th><input type="submit" value="update"></tr>
</table>
</form>
</body>
</html>
and my servlet code is
Code:
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class updatedemo extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            // Apache Commons-Fileupload library classes
            DiskFileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload sfu  = new ServletFileUpload(factory);

            if (! ServletFileUpload.isMultipartContent(request)) {
                System.out.println("sorry. No file uploaded");
                return;
            }

            // parse request
            List items = sfu.parseRequest(request);
            FileItem  product_div = (FileItem) items.get(0);
            String productdiv =  product_div.getString();

			FileItem product_name = (FileItem) items.get(1);
            String   productname =  product_name.getString();

			FileItem  product_id = (FileItem) items.get(2);
            String productid =  product_id.getString();
            
            
            // get uploaded file
            FileItem file = (FileItem) items.get(3);

			FileItem product_des = (FileItem) items.get(4);
            String   productdes =  product_des.getString();
                        
            // Connect to Oracle
            Class.forName("oracle.jdbc.driver.OracleDriver");
            Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "system", "tiger");
            con.setAutoCommit(false);

            PreparedStatement ps = con.prepareStatement("update product set product_div=?,product_name=?,product_id=?,product_photo=?,product_des=?");
            ps.setString(1, productdiv);
			ps.setString(2, productname);
            ps.setString(3, productid);
            // size must be converted to int otherwise it results in error
            ps.setBinaryStream(4, file.getInputStream(), (int) file.getSize());
			ps.setString(5, productdes);
            ps.executeUpdate();
			ps.close();
            con.commit();
            con.close();
            out.println("Product details updated sucessfully. <p> <a href='listphotos'>List Photos </a>");
        }
        catch(Exception ex) {
            out.println( "Error --> " + ex.getMessage());
        }
    } 
}