What are the mistake in this JSP program?

Hi,all. I am a newcomer to learn JSP, and I sincerely hope somebody help me. the following is a JSP program, and I want it extract data from my database and show them on webpage as XML. But there always have some mistakes I cann't found it. Could somebody help me find out them and tell me how to correct. Thanks veeeeeeeeeeeery much!
<%@ page contentType = "text/xml" %>
<%@ page language="java" %>
<%@ page import = "java.sql.* " %>
<%@ page import = "java.io.* " %>
<%@ page import = "javax.xml.parsers.DocumentBuilder" %>
<%@ page import = "javax.xml.parsers.DocumentBuilderFactory" %>
<%@ page import = "org.w3c.dom.Document" %>
<%@ page import = "org.w3c.dom.Element" %>
<%@ page import = "org.w3c.dom.Node" %>
<%@ page import = "org.w3c.dom.NodeList" %>
<%@ page extends = "Object"%>
<html>
<head><title>Searching Page</title></head>
<body>
<p><INPUT size=22 name=T1></p>
<p><INPUT type=submit value=OK name=B3></p>
<% Document retailerDoc = null;
Document dataDoc = null;
Document newDoc = null;
     try {
     DocumentBuilderFactory dbfactory = DocumentBuilderFactory.newInstance();
     DocumentBuilder docbuilder = dbfactory.newDocumentBuilder();
     retailerDoc = docbuilder.parse("RetailerXmlExtract.xml");
               //Instantiate a new Document object
               dataDoc = docbuilder.newDocument();
               //Instantiate the new Document
               newDoc = docbuilder.newDocument();
          }catch(Exception e){}
          //Retrieve the root element
          Element retailerRoot = retailerDoc.getDocumentElement();
          //Retrieve the (only) data element and cast it to Element
          Node dataNode = retailerRoot.getElementsByTagName("data").item(0);
          Element dataElement = (Element)dataNode;
          String driverName = "sun.jdbc.odbc.JdbcOdbcDriver";
          String connectURL = "jdbc:odbc:Retailer";
          Connection db = null;
          try{
               Class.forName(driverName);
               db = DriverManager.getConnection(connectURL);
               catch(ClassNotFoundException e){}
               catch(SQLException e){}
          //Create the PreparedStatement
          PreparedStatement statement = null;
          //Create the Resultset object, which ultimately holds the data retrieved
          ResultSet resultset = null;
          //Create the ResultSetMetaData object, which will holds
          //information about the ResultSet
          ResultSetMetaData resultmetadata = null;
          //Create a new element called "data"
          Element dataRoot = dataDoc.createElement("data");
          try{
               statement = db.prepareStatement("SELECT * FROM Orders");
               //Execute the query to populate the ResultSet
               resultset = statement.executeQuery();
               //Get the ResultSet information
               resultmetadata = resultset.getMetaData();
               //Determine the number of columns in the ResultSet
               int numCols = resultmetadata.getColumnCount();
               //Check for data by moving the cursor to the first record(if there is one)
               while(resultset.next()){
                    //For each row of data, create a new element called "row"
                    Element rowEl = dataDoc.createElement("row");
                    for(int i = 1; i <= numCols; i++){
                         //For each colum index, determine the column name
                         String colName = resultmetadata.getColumnName(i);
                         //Get the column value
                         String colVal = resultset.getString(i);
                         //Determine if the last column accessed was null
                         if(resultset.wasNull()){
                              colVal = "and up";
                         //Create a new element with the same name as the column
                         Element dataEl = dataDoc.createElement(colName);
                         //Add the data to the new element
                         dataEl.appendChild(dataDoc.createTextNode(colVal));
                         //Add the new element to the row
                         rowEl.appendChild(dataEl);
                    //Add the row to the root element
                    dataRoot.appendChild(rowEl);
          catch(SQLException e){}
          finally{
                    try{
                         db.close();
                         }catch(SQLException e){}
          //Add the root element to the document
          dataDoc.appendChild(dataRoot);
          //Retrieve the root element (also called "root")
          Element newRootInfo = (Element)retailerRoot.getElementsByTagName("root").item(0);
          //Retrieve the root and row information
          String newRootName = newRootInfo.getAttribute("name");
          String newRowName = newRootInfo.getAttribute("rowName");
          //Retrive information on element to be built in the new document
          NodeList newNodesRetailer = retailerRoot.getElementsByTagName("element");
          //Create the final root element with the name from the file
          Element newRootElement = newDoc.createElement(newRootName);
          //Retrieve all rows in the old document
          NodeList oldRows = dataRoot.getElementsByTagName("row");
          for(int i=0;i<oldRows.getLength();i++){
               //Retrieve each row in turn
               Element thisRow = (Element)oldRows.item(i);
               //Create the ner row
               Element newRow = newDoc.createElement(newRowName);
                    for(int j=0;j<newNodesRetailer.getLength();j++){
                         //For each mode in the new mapping, retrieve teh information
                         //First the new information........
                         Element thisElement = (Element)newNodesRetailer.item(j);
                         String newElementName = thisElement.getAttribute("name");
                         //Then the old information
                         Element oldElement = (Element)thisElement.getElementsByTagName("content").item(0);
                         String oldField = oldElement.getFirstChild().getNodeValue();
                         //Get the original values based on the mapping information
                         Element oldValueElement = (Element)thisRow.getElementsByTagName(oldField).item(0);
                         String oldValue = oldValueElement.getFirstChild().getNodeValue();
                         //Create the new element
                         Element newElement = newDoc.createElement(newElementName);
                         newElement.appendChild(newDoc.createTextNode(oldValue));
                         //Retrieve list of new elements
                         NodeList newAttributes = thisElement.getElementsByTagName("attribute");
                         for(int k = 0;k<newAttributes.getLength();k++){
                              //For each new attribute, get the order information
                              Element thisAttribute = (Element)newAttributes.item(k);
                              String oldAttributeField = thisAttribute.getFirstChild().getNodeValue();
                              String newAttributeName = thisAttribute.getAttribute("name");
                              //Get the original vale
                              oldValueElement = (Element)thisRow.getElementsByTagName(oldAttributeField).item(0);
                              String oldAttributeValue = oldValueElement.getFirstChild().getNodeValue();
                              //Create the new attribute
                              newElement.setAttribute(newAttributeName, oldAttributeValue);
                         //Add the new element to the new row
                         newRow.appendChild(newElement);
                    //Add the new row to the root
                    newRootElement.appendChild(newRow);
               //Add the new root to the document
               newDoc.appendChild(newRootElement);
          try{
               out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
               out.ptintln("<!DOCTYPE orders SYSTEM \"RetailerXml.dtd\">");
               out.println(newRootElement.toString());
          } catch(IOException e) {}
%>
</body>
</html>

it reminded that there were some mistakes when i run this JSP program,so it must have something wrong, but due to my weak programming skills, I can not found these mistakes out. That must give me very useful help if you tell me how to solve them. thank you vrey much!

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