Invalid Handle SQL Exception

Question

Everytime I call this method from my JSP page, I get the error Invalid Handle. I changed my query statement at the most bottom part to a hard-coded update statement (this one update wirtech.orders_temp set BOOKCODE ='12345678', QUANTITY = '150', SUPPLIER = 'rain', STAT = 'pending', FULFILLED = '0', CONSOLIDATED = '1', CONSOLIDATEID ='1' where POID = '10003) but i still get that error. I traced my program and found out the error comes out at After System.out.println("hereba2"+query);. That's the line before stmt.executeupdate(query); at the bottom part of the consolidatePOS method.
Please help, we've been stuck here for one week already.
     public void consolidatePOS(Vector v, String code)
          try{
               String poidfinal = "";
               int y = 0;
               int qty = 0;
               Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
               con = DriverManager.getConnection(url, username, password);
            stmt = con.createStatement();
            System.out.println("before big while."+v.size());
               while(y<v.size())
            query = "select QUANTITY from wirtech.orders_temp where POID = '"+v.elementAt(y)+"'";
            System.out.println("first stmt.execute");
            rs=stmt.executeQuery(query);
            System.out.println("inside medium while.");
            while (rs.next())
                 System.out.println("inside small while.");
                 qty = qty + rs.getInt("QUANTITY");
            if(y == v.size()-1)
                 poidfinal = ""+v.elementAt(y);
            y++;
            rs.close();
            System.out.println("after big while.");
            int ea = getConsolidateID();
            System.out.println("ea"+ea);
            System.out.println("here ba/!?");
            query = "update wirtech.orders_temp set BOOKCODE ='12345678', QUANTITY = '150', SUPPLIER = 'rain', STAT = 'pending', FULFILLED = '0', CONSOLIDATED = '1', CONSOLIDATEID ='1' where POID = '10003'";
            System.out.println("here ba2"+query);
            stmt.executeUpdate(query);
            System.out.println("after big while. LASTT");
            stmt.close(); con.close();
            } catch(Exception ex) {
                 System.out.println("error in consolidatePOS()" + ex);     
          public int getConsolidateID()
          {int x =0;
               try {
            Class.forName(driver);
            con = DriverManager.getConnection(url, username, password);
            stmt = con.createStatement();
            query = "SELECT COUNT(DISTINCT CONSOLIDATEID) AS count FROM wirtech.orders_temp";
            rs = stmt.executeQuery(query);
            while (rs.next()) {
                x = rs.getInt("count");
            rs.close();
            stmt.close();
            con.close();
        } catch (Exception e) {
            System.out.println("getTransactionCount has an Exception: " + e);
        }

Answer 1

This is a complete guess! ... perhaps the
rs.close();also closes the Statement (or invalidates it) which you use later to execute the update. The API does not seem to indicate this though:
void close()
           throws SQLException
    Releases this ResultSet object's database and JDBC resources immediately instead of waiting for this to happen when it is automatically closed.
    Note: A ResultSet object is automatically closed by the Statement object that generated it when that Statement object is closed, re-executed, or is used to retrieve the next result from a sequence of multiple results. A ResultSet object is also automatically closed when it is garbage collected. But perhaps it may still be worthwhile seeing if removing that close will fix the problem.