RE: Scope / Instantiation of JSP pages / declarations

[Randy Layman <ra...@aswethink.com>]

see intermixed....

> -----Original Message-----
> From: Thorsten Barth [mailto:barth@web-arts.de]
> Sent: Thursday, February 28, 2002 9:55 AM
> To: Tomcat Users List
> Subject: Scope / Instantiation of JSP pages / declarations
> 
> 
> If two requests are accessing the same page at the same time, 
> this messes 
> all up, so I would like to change this behaviour. I searched 
> Suns JSP specs 
> and the tomcat documentation, but I just found an attribute 
> in the page 
> directive that forces serialization of the requests 
> (threadsafe="false") - 
> but I think that would significantly reduce performance...
Yes it would.
> 
> Do you know
> - if and why the current behaviour of tomcat is intended?
Yes - it keeps memory consumption down (instead of having thousands of
instances of the JSP class for thousands or requests, you have only one)
> - where I can search for more info?
The JSP Spec and Servlet Spec would probably be good resources
> - if there is an option that tells Tomcat to create a new 
> instance of JSP 
> pages every time they are called
I don't believe so
> 
> P.S: Allaire JRUN seems to behave different ....
If so then it doesn't comply with the JSP spec.


	One thing to remember is that only variables declared in the <%! ...
%> blocks and page scoped beans are shared between requests.  If you want
variables that are used only in the scope of one request then either use <%
... %> blocks or set your bean scope to request.

	Randy

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