How do i track clicks with jsp/servlets?

I would like to know how to imitate the click of link in JSP or serlvet, in order to track clicks.
I have pages with links containing tel protocol URIs like this:
Click here to listen!
I want to replace the above with something like this:
Click here to listen!
And have call_tracking.jsp do its tracking stuff and then spawn a phone call, just like the first example does. I do not want to bother the user with another page, hence the need to accomplish the click action programmatically. I presume this feat is achievable via Response header magic, I just don't know the right incantation ;-)
Thanks

You should create a servlet to track the links, let´s say LinkTracker. Here I have an example for you. Each link calls a servlet and pass the url as a parameter.
<html>
<head>
    <title>Some Links Tracked by the LinkTracker Servlet</title>
</head>
<body>
Some good links for you. Each link is directed
through the LinkTracker Servlet. Click on a few and visit
the <a href="LinkTracker">LinkTracker Servlet</a>.
<ul>
    <li><a href="LinkTracker?link=http://www.google.com">
      Google Site</a></li>
    <li><a href="LinkTracker?link=http://www.yahoo.com">
      Yahoo site</a></li>
    <li><a href="LinkTracker?link=http://java.sun.com">
      Sun Microsystems</a></li>
</ul>
</body>
</html>And here the code to LinkTracker servlet
public class LinkTracker extends HttpServlet {
static private Hashtable links = new Hashtable();
String tstamp;
public LinkTracker() {
    tstamp = new Date().toString();
public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
    throws IOException, ServletException {
    String link = request.getParameter("link");
    if (link != null && !link.equals("")) {
      synchronized (links){
        Integer count = (Integer) links.get(link);
        if (count == null) {
          links.put(link, new Integer(1));
        else {
          links.put(link, new Integer(1+count.intValue()));
      //here the servlet redirect the client to the link he clicked
      response.sendRedirect(link);
    else {
      response.setContentType("text/html");
      PrintWriter out = response.getWriter();
      request.getSession();
      out.println("<html>");
      out.println("<head>");
      out.println("<title>Links Tracker Servlet</title>");
      out.println("</head>");
      out.println("<body>");
      out.println("<p>Links Tracked Since");
      out.println(tstamp+":</p>");
      if (links.size() != 0) {
        Enumeration enum = links.keys();
        while (enum.hasMoreElements()) {
          String key = (String)enum.nextElement();
          int count = ((Integer)links.get(key)).intValue();
          out.println(key+" : "+count+" visits<br>");
      else {
        out.println("No links have been tracked!<br>");
      out.println("</body>");
      out.println("</html>");
public void doPost(HttpServletRequest request,
                    HttpServletResponse response)
    throws IOException, ServletException {
    doGet(request, response);
}

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andrea costantinis wrote:
Hi,
I developed a JSP/servlet test application that makes
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I successfully compile and annotate the application.
I am also able to successfully generate the db
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Unfortunately, Kodo is still unable to initialize and
gives the following message:
The system could not initialize; the following registered
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class com.dpov.catalog.Product,
class com.dpov.uidgen.counter.Counter,
class com.dpov.catalog.dao.jdo.CategoryHierarchyEntry,
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class com.dpov.catalog.Category,
class com.dpov.lineitem.LineItem,
class com.dpov.dealer.Dealer,
class com.dpov.user.User,
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