Forum:

JSP translated into a Servlet

Ranch Hand

Posts: 52

posted 16 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Dear ranchers,

From Head First Servlet and JSP i know that a JSP will be translated to be a Servlet by the container.

And I tried the example :

I refreshed the page, the count got increased. This is normal.
But when I open a new window and open the jsp page, the count continued, while i expect it reset to zero.

And the most confusing part for me, the count still continued even i close the page.

Would someone explain to me about case above?

Sun Certified Programmer for the Java 2 Platform, Standard Edition 5.0 (88 %)

Bear Bibeault

Sheriff

Posts: 67753

173

I like...

posted 16 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

You declared your int to be shared across all invocations. Why should you be surprised?

[Asking smart questions] [About Bear] [Books by Bear]

HTML 5 (verified skill)
Skill verified by Jeanne Boyarsky

CSS 3 (verified skill)
Skill verified by Jeanne Boyarsky

JavaScript (verified skill)
Skill verified by Jeanne Boyarsky

Faber Siagian

Ranch Hand

Posts: 52

posted 16 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

ok let me tell you about how do i look this case.

The value of count will be increased though i open more than one window, because every request is handled by a thread, with the same servlet.

Next..
I think the servlet instance will be destroyed if all of the request is processed completely. So when i close all of the browser, then i open a new one, count's value should be reset to zero.

But actually the value of count still continued even though i close the browser. Here where i get confused.

Sun Certified Programmer for the Java 2 Platform, Standard Edition 5.0 (88 %)

Brij Garg

Ranch Hand

Posts: 234

posted 16 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

int is a part of the declaration section in you code.
Whatever we declare in this section becomes instance memeber of the class.

You must be knowing when container invokes the servlet,init method is called just once.All request by threads are handled by service method.

In your case there is just one instance of this class in the memory and Whne you opened new session, instance is still there in the memory.
So you have two different threads.
instance variable are shared by threads.

I hope this hepls you.

Bear Bibeault

Sheriff

Posts: 67753

173

I like...