I'm not a JSP/Servlet expert, but try cookies or static variables.

U can Use the ServletContext or HttpSession to store your
variables

For Example..
HttpSession session;
session = req.getSession(true);
session.setAttribute("user_name",userName);

Hope this info will help U .

Using session will only be "global" within each user.
The ways that will make it truly global  for each user,
is the application object or any other number of ways
involving the servlet  configuration.

this is what the HttpSession is for. Use the setAttribute method. If you
want to share the
variable across several contexts make sure that you have enabled this in
your server settings.

Sorry. i mean to say in context-param tags in the web.xml file.

use a bean in application scope

i.e. <jsp:useBean id="global" class="com.mybeans.Global" scope="application"
/>
then any variables inside that bean can be seen in any jsp.
i.e. String str = global.getEmployeeName();

U can define ur parameter/ values in the web descriptor file, in the
init-param tags.

You can create a class with getter and setter for a variable  which you
wants to access globally and get the variable from any servlet.