Thanks.
I try this, but it is different from what I expected.
In my doGet() of my servlet, I have a Counter object in my session.
When I reload the page in my browser, I see the value of the counter
increments. (say from "0" to "1" to "2").
Then I go to the Tomcat manager web page, and then "undeploy" the original
servlet, and "deploy" a newer version of the same servlet (context name is
the same). The value of the counter starts from "0" again when I reload the
page again.
The difference between the orginal servlet and the new servlet is the name
of the Method "inc()". I rename it to "newInc()" in the new servlet.
I am expecting the value of the counter will be "3" when I reload the
browser after I undeploy/deploy the servlet. Is this a correct assumption?
Here is the portion of the doGet() method in my servlet.
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
HttpSession session = request.getSession(true);
Counter sessionCounter = (Counter)
session.getAttribute("session_counter");
if (sessionCounter == null) {
sessionCounter = new Counter();
session.setAttribute("session_counter", sessionCounter);
}
// rename inc() to newInc()
sessionCounter.inc();
out.println("session counter =");
out.println(sessionCounter.getValue());
}
-----Original Message-----
From: Shapira, Yoav [mailto:[EMAIL PROTECTED]
Sent: Friday, March 05, 2004 7:44 AM
To: Tomcat Users List
Subject: RE: Hotswap servlet code in Tomcat 5?
Hi,
>If the objects in the session is serialized to the disk and then
>re-serialized when I re-deploy my servlet, what happens if the class in
my
>newer version of my servlet has
>- added/removed methods/attributes in the class
>- added/removed static variables in the class
>
>How will the hotswap work?
One has nothing to with the other, unless you're design is so bad that
it places a instance of your servlet class as a session attribute.
Yoav Shapira
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