[jdom-interest] Please Help!

Molina, Alexis E aemolina at kpmg.com
Tue Apr 3 20:33:44 PDT 2001

Hello All:
   I'm in a serious jam here, and I'm hoping someone can help.
I have created a class (SchedulerJDOMHandler.class) that uses SaxBuilder to
grab some data from an XML source, based on an ID I pass it.
I have a servlet that invokes the getData() method of
SchedulerJDOMHandler.class.  The getData method should retrieve a list of
values from the xml file, then append them to a url string as parameters,
and return the final url string to the servlet.
To test it, I also created a little program called TestClass.class.  This
program and servlet are virtually identical in their function.

The problem is, when I run TestClass, it returns the final string perfectly
like so:
C:\Program Files\Allaire\JRun\servers\default\cdnm\WEB-INF\classes>java
America - East"&mantype="Cisco Content Switch"&format="MIB"&pollfreq="5"

But, when I do the same thing from the servlet, it only returns what the url
string was initialzed to (like: ../scheduler/config_scheduler.jsp?), but
without the appended parameter values grabbed from the XML source.   For
your convenience, I am pasting the code for the 3 classes below.  Could
someone please explain why TestClass.class get's the correct data returned
to it, but the servlet (GetSchedulerData.class) doesn't?  A serious thanks,
in advance, to anyone that can possibly help!  If it would help to have the
XML file, please let me know and I'll be glad to post it as well.


Alexis Molina
San Diego, CA

import java.util.*;
import java.net.*;
import org.jdom.*;
import org.jdom.input.SAXBuilder;

public class SchedulerJDOMHandler

  //public static String filePath = "scheduler_config.xml";
  //public static String idPassed = passedID;

  public static List callListData(String idPassed, String xmlUrl) throws
JDOMException {
    return listData(xmlUrl, idPassed);

  public static List listData(String xmlUrl, String passedID)
   throws JDOMException, NullPointerException {

    if (xmlUrl == null) {
      throw new NullPointerException("File Path must be non-null");

    SAXBuilder builder = new SAXBuilder();
    // Load the entire document into memory
    // from the network or file system
    Document doc = builder.build(xmlUrl);

	// Descend the tree and find the Elements
	Element schedulersRoot = doc.getRootElement();
    List schedulers = schedulersRoot.getChildren("scheduler");
    Vector schedulerData = new Vector(schedulers.size());
    Iterator iterator = schedulers.iterator();
    while (iterator.hasNext()) {
      Object o = iterator.next();
      Element scheduler = (Element) o;
      try {

		Element id = scheduler.getChild("id");
		String idContent = id.getTextTrim();
		// Only grab content from record matching idPassed
		if(idContent.equals(passedID)) {


			Element zone = scheduler.getChild("zone");
			if (zone == null) continue;
			String zoneContent = zone.getTextTrim();

			Element manufacturerType =
			if (manufacturerType == null) continue;
			String manufacturerTypeContent =

			Element format = scheduler.getChild("format");
			if (format == null) continue;
			String formatContent = format.getTextTrim();

			Element pollingFrequency =
			if (pollingFrequency == null) continue;
			String pollingFrequencyContent =

			Element ftpUrl = scheduler.getChild("ftpurl");
			if (ftpUrl == null) continue;
			String ftpUrlContent = ftpUrl.getTextTrim();

			Element userID = scheduler.getChild("userid");
			if (userID == null) continue;
			String userIDContent = userID.getTextTrim();

			Element password = scheduler.getChild("password");
			if (password == null) continue;
			String passwordContent = password.getTextTrim();
      catch (Exception e) {
    return schedulerData;


  public String getData(String idPassed, String xmlUrl, String UrlRoot)
	//Create URL
	StringBuffer redirectURL = new StringBuffer(500);

	try {

      List schedulerData;
      schedulerData = callListData(idPassed, xmlUrl);

	  String strID = (String)schedulerData.get(0);
	  String strZone = (String)schedulerData.get(1);
	  String strManType = (String)schedulerData.get(2);
	  String strFormat = (String)schedulerData.get(3);
	  String strPollFreq = (String)schedulerData.get(4);
	  String strFtpUrl = (String)schedulerData.get(5);
	  String strUserID = (String)schedulerData.get(6);
      String strPass = (String)schedulerData.get(7);

      //Append parameters to redirectUrl
      redirectURL.append("id=\"" + strID + "\"&");
      redirectURL.append("zone=\"" + strZone + "\"&");
      redirectURL.append("mantype=\"" + strManType + "\"&");
      redirectURL.append("format=\"" + strFormat + "\"&");
      redirectURL.append("pollfreq=\"" + strPollFreq + "\"&");
      redirectURL.append("ftpurl=\"" + strFtpUrl + "\"&");
      redirectURL.append("userid=\"" + strUserID + "\"&");
      redirectURL.append("pass=\"" + strPass + "\"");

	  //Return the Value
	  return redirectURL.toString();
	catch (JDOMException jdme) {
		System.out.println("JDOMException Occured :" +
	catch (NullPointerException ne) {
		System.out.println("NullPointerException Occured :" +
	catch (Exception e) {
		System.out.println("Some Exception Occured :" +
	//Return the Value
	return redirectURL.toString();

import java.io.*;
import java.util.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class GetSchedulerData extends HttpServlet {

	public void init(ServletConfig config) throws ServletException
		super.init( config );

	public void destroy()

	public String getServletInfo()
		return this.getClass().getName();

	public void service(HttpServletRequest req, HttpServletResponse res)
	     throws ServletException, IOException
		// Set the content-type to HTML

		// Get the PrintWriter for the servlet response
		PrintWriter out = res.getWriter();

		// Retrieve field values entered
		String schedulerID = req.getParameter("id");
		//String schedulerID = "ftp.la.viacom.com";
		String xmlUrl = "scheduler_config.xml";
		String redirectUrlRoot =

		SchedulerJDOMHandler dataRetrieved = new
		String finalRedirectUrl = dataRetrieved.getData(schedulerID,
xmlUrl, redirectUrlRoot);

			//Redirect and Pass all Data Parameters
			out.println("Hell Yep!");
		catch (Exception e)
			out.println("Exception: " + e);

public class TestClass
	public static void main(String[] args)

		String schedulerID = "ftp.dc.viacom.com";
		String xmlUrl = "scheduler_config.xml";
		String redirectUrlRoot =

		SchedulerJDOMHandler dataRetrieved = new
		String finalRedirectUrl = dataRetrieved.getData(schedulerID,
xmlUrl, redirectUrlRoot);

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