Maximum number of sessions has already been reached...

Question

I have a web application which is made up of a servlet and some jsps. I run a test which puts a load on the webserver which sends multiple requests to the webserver so we can monitor the load.
The problem is, my application is not handling anything gracefully when the webserver reaches it's max # of sessions. I don't want to change the default 1000 sessions, but I want to direct users to a friendly error page if this situation ever occurs.
This is the beginning of my doGet method:
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
java.sql.Date fromDate = null;
java.sql.Date toDate = null;
String storySection = null;
int history = 0;
int numberOfRecords = 0;;
HttpSession session = request.getSession(true);
System.out.println("Checking if session is null***");
if(session == null) throw new SQLException("SESSION IS NULL!");
if(request.isRequestedSessionIdValid() == false) throw new SQLException("SESSION NOT VALID!");
System.out.println("Session passed fine!!!!!!!!!!!!!!");
This is the output from iPlanet 4.1SP5 errors log file:
--- (messages before this point were just loading jsp + servlets; i.e. no errors before this point) ---
[28/Feb/2002:09:44:21] info (21849): Internal Info: loading servlet /mmd/SquawkMessage.jsp
[28/Feb/2002:09:48:09] warning (21849): SimpleSessionManager: cannot create a new session as the limit on maximum number of sessions has already been reached: (1000)
[28/Feb/2002:09:48:09] failure (21849): Internal error: exception thrown from the servlet service function (uri=/mmd/SquawkHeadlines.jsp): java.lang.NullPointer
Exception, Stack: java.lang.NullPointerException
at jsps.mmd._SquawkHeadlines_jsp._jspService(Compiled Code)
at org.apache.jasper.runtime.HttpJspBase.service(Compiled Code)
at javax.servlet.http.HttpServlet.service(Compiled Code)
at com.netscape.server.http.servlet.NSServletRunner.Service(Compiled Code)
--- (messages after this point were more of the same until I killed the load test) ---
Any advice? I need to find out how to handle this problem gracefully.
Thank you,
Karen
[email protected]

Answer 1

Hi,
You can have an application variable that increments by one, when each new session is started. That way you can check whether the total no.of sessions have reached 1000, if yes, u can redirect the user to an error page.
Please get back to me if u still can't get the problem solved.
SURESH B
[email protected]