Same variable on every JSP page

Hi All,
I'm just a beginner with JSP so excuse me if this is a 'stupid' question.
I'm building an Application that uses MySQL database everything works ok, but
I would like to know if there is a way to have a variable that I can use on every page.
The reason is, is because I have lots of pages (and growing) where I have the
database connect string with username password, but due to security reason
the user/pass for the database will change every now and then.
I'm familiar with Coldfusion and in Coldfusion you can setup an Application.cfm file. This file is called before every other .cfm file. Is there something like that
in JSP?
The solution I thought of is, putting the connect string into a session variable.
Is this a could idea?
If not, are there any other better ways of achiving this?
Thanks for any help!
Steven.

Are you using Tomcat?
Because Tomcat supports things like Application.cfm did with CF. They go in web.xml, I believe (I don't use tomcat myself).
Your database connect (and interaction) should not be handled by individual pages. It should be in a bean, connection pooling (tomcat), JSTL, or other more scalable method (or combination of techniques that works for you). If you put it all in scriptlets, you really limit yourself later.
I am assuming from your post that the username/pass is the same for all users. If it isn't, use a session-scoped bean to hold that info.

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