Servlets/jsp

I would like to know whats suitable to be used from below:
1. From JSP call servlet to create a xml file and pass back to jsp and then display on jsp OR
2. Call a plain java class using a scriptlet from jsp which will create xml and return to jsp.
I would like to understand the difference/benefits/drawbacks in using the above approaches.

Also in servlets is it bad to have global variables? Does that have any risk?
michaelm702Asked:
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rrzCommented:
What will initiate the call to create the XML? Will the user click a button or a link?
>Also in servlets is it bad to have global variables? Does that have any risk?
What kind of data would it hold?  Is it something that won't change? Is it the same value for all users of your web app? Do you know about scoped objects? If not, then look at
http://docs.oracle.com/javaee/1.4/tutorial/doc/Servlets5.html
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michaelm702Author Commented:
The user will open the jsp and when it loads I was thinking of calling java class using scriptlet.
for servlet i was planning to put a submit button which will call servlet.
Global variable few have contant value and others values can change as per the user calling the jsp. For e.g. I have a form which takes two numbers and operation(add,subtract etc..)
so the users accessing my application will always supply two number and a operation so one user says 2+3 and other 3-2..
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rrzCommented:
>The user will open the jsp and when it loads I was thinking of calling java class using scriptlet.
Do you mean to say that the user will request the JSP. The server will respond with the JSP's output. When it loads in the browser, it is on the client-side. Could you use javascript to create the XML? Or do you need some data from the server?
>so the users accessing my application will always supply two number and a operation
That sounds like you could use session-scoped objects on the server or just use javascript in the browser .  

Please describe how you want your web app to work in more detail.
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michaelm702Author Commented:
I am just trying to see the best practice that needs to be followed.

Do you mean to say that the user will request the JSP. The server will respond with the JSP's output. When it loads in the browser, it is on the client-side. Could you use javascript to create the XML? Or do you need some data from the server?
-> I need some data from server too.
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rrzCommented:
>I am just trying to see the best practice that needs to be followed.    
The popular approach is to use a web framework. There are a lot of them. Look at  
http://en.wikipedia.org/wiki/Comparison_of_web_application_frameworks#Java   
http://zeroturnaround.com/rebellabs/the-curious-coders-java-web-frameworks-comparison-spring-mvc-grails-vaadin-gwt-wicket-play-struts-and-jsf/
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