Thanks for the reply. I got rid of the problem by putting <%! int
var; %> and doing
<% var = 0 ; var++ %>
thanks again
liza
--- Jim Bailey <[EMAIL PROTECTED]> wrote:
> Yes, that is how it is supposed to work.
>
> The syntax <%!...%> creates a class variable for the servlet
> created from
> the JSP. It is the same as if you typed the following:
>
> public class MyCustomServlet
> {
> int var = 0;
>
> public void _jspService(HttpServletRequest request,
> HttpServletResponse
> response)
> throws IOException, ServletException
> {
> var++;
>
> out.println( var );
> }
> }
>
> Keep in mind that the class is instantiated at the whim of the
> application
> server. You can't assume that each invocation will create a new
> instance of
> the class. For efficiency the application server will keep the
> original
> instance around in memory and simply re-invoke the _jspService
> method as it
> needs to.
>
> You also can't assume that the application server won't destroy the
> instance
> of the class and subsequently create a new instance as it is
> needed. The
> server may also keep multiple instances of the servlet class around
> in
> memory at the same time.
>
> The best advice is to only declare constants using the <%! %>
> syntax. Avoid
> creating mutable class variables using this technique. It is very
> difficult
> to get right.
>
> As a postscript, the syntax <%! var++ %> is incorrect and as far as
> I know
> won't compile. The <%! %> scriplet tag is for creating class
> declarations
> and the syntax of the following is incorrect:
>
> public class MyCustomServlet
> {
> int var = 0;
> var++;
>
> public void _jspService(...
> }
>
> I hope this helps.
>
> -----Original Message-----
> From: Liza J Alenchery [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, May 31, 2000 1:33 PM
> To: [EMAIL PROTECTED]
> Subject: Problem with variables.
>
>
> I have declared a variable in my JSP page as
> <%! int var = 0 ;
> %>
> and somewhere else, I do
>
> <% var ++ ; %>
> and also
> <%! var++; %>
>
> The problem is that when each time I come to the page in the
> browser,
> the previous values are held in the integer var. It does not get
> reset to 0. What is happening here?
>
> thanks in advance
> liza
>
>
> __________________________________________________
> Do You Yahoo!?
> Send instant messages & get email alerts with Yahoo! Messenger.
> http://im.yahoo.com/
>
>
===========================================================================
> To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
> JSP-INTEREST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
>
>
===========================================================================
> To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
> JSP-INTEREST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
__________________________________________________
Do You Yahoo!?
Send instant messages & get email alerts with Yahoo! Messenger.
http://im.yahoo.com/
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
