Hey Stanley.. things who's scope are "application" are shared by all of the
users using the webapp at the same time. So if you and I are both running
that page, there's a chance that we'll try to access that bean at the exact
same time. Because of that, it has to be synchronized, so that only one
person can do it at a time.
Session beans don't have to be synched, because there is 1 instance of that
bean per user. So in that case, you have an instance of sessionCounter, and
I have an instance, so we don't share one between us. In that case, there's
no need to synchronize, since we each have our own copy.
Hope this helps,
Roy
----- Original Message -----
From: "Stanley Tan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, April 05, 2001 3:07 AM
Subject: Synchronization Issues
> Hi all,
>
> Following jGuru's "Introduction to JavaServer Pages Technology", I have
> come across the following code:
>
> <%@ page import="CounterBean" %>
>
> <jsp:useBean id="sessionCounter" class="CounterBean" scope="session" />
> <jsp:useBean id="applicationCounter" scope="application"
class="CounterBean"/>
>
> <%
> sessionCounter.increaseCount();
> synchronized (page) {
> applicationCounter.increaseCount();
> }
> %>
>
>
> Why is the sessionCounter not synchronized but the applicationCounter
> is? And why is applicationCounter synchronized on "page" instead of on
> "application"?
>
> Thanks for your help.
>
> Stanley Tan
>
>
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