Hello J2EE programmers

I wrote a JSP some time ago that uses a class SessionCounter (which
implements HttpSessionListener) to count the active sessions of a web
application and to display them.

Unfortunately there seems to be a problem with my program, because the
web application says that there are currently -18 active sessions.
However, the lowest possible count should be 0.

Of course I could implement the sessionDestroyed the following way (to
prohibit a negative session count, but then the current session count
would not be correct, not?
  public void sessionDestroyed(HttpSessionEvent event) {
    if (activeSessions > 0)
     activeSessions--;
  }

Code of JSP file:
 <tr>
  <td>Concurrent sessions:</td>
  <td><%= SessionCounter.getActiveSessions() %></td>
 </tr>
 <tr>
  <td>Last refresh:</td>
  <td><%= new Date() %></td>
 </tr>
 <tr>
  <td>Last session change:</td>
  <td><%= SessionCounter.getLastChange() %></td>
 </tr>

Here's the class SessionCounter, which belongs to a utility JAR that is
situated in the lib directory of The web application.

 public class SessionCounter implements HttpSessionListener {

  /** Static variable to keep track of the current number of active
sessions. */
  private static int activeSessions = 0;

  public void sessionCreated(HttpSessionEvent event) {
    activeSessions++;
  }

  public void sessionDestroyed(HttpSessionEvent event) {
    activeSessions--;
  }

  public static int getActiveSessions() {
    return activeSessions;
  }
 }


I'm using Tomcat 4.1.24 and hope that someone of you might give me a
hint on how I can get a reliable session counter.

Christian


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