Question : How can I limit the amount of sessions that may be created using tomcat 5?

Im using a web server running tomcat 5 and I cannot figure out how to limit the amount of users that may have a session with my webapp concurrently (simultaneously). How can I limit the amount of sessions that may be created using tomcat 5?

Answer : How can I limit the amount of sessions that may be created using tomcat 5?

You could something like the code below to keep a count of the sessions.  You can check count before creating a session in each servlet and JSP.    In each JSP you could use  
<%@ page session="false" %>  
to avoid automatic  session creation.
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package rrz;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SessionListener implements HttpSessionListener {
  HashSet sessionSet = null;
  ServletContext application = null;
  public void sessionCreated(HttpSessionEvent event) {
             HttpSession session = event.getSession();
             if(application == null)application = session.getServletContext();
             sessionSet = (HashSet)application.getAttribute("sessionSet");
             if(sessionSet == null){
                        application.setAttribute("sessionSet",new HashSet());  
                        sessionSet = (HashSet)application.getAttribute("sessionSet");
             }
             sessionSet.add(session.getId());                        
  }
  public void sessionDestroyed(HttpSessionEvent event) {
                                       sessionSet.remove(event.getSession().getId());
  }
}
 
Register it in your web app's web.xml with 
 
    
              rrz.SessionListener
    
 
and test it on a JSP with  
 
<%
   session.setMaxInactiveInterval(3);   // for easy testing
%>
Session count is <%=((HashSet)application.getAttribute("sessionSet")).size()%>
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