How can I store a single instance of a hashtable

How can I store a single instance of a hashtable in a predefined application object that way I can use it by all sessions? I've tried storing a instance of hashtable in the session but it only allows for one user and it doesn't accomplish my goal in the web application. Could show me how i could store a single instance of a hashtable in a predefined application object? Or at least a link which demonstrates it
thanks

assuming ctx is an instance of javax.servlet.ServletContext (which can be retrieved from the ServletConfig).
ctx.setAttribute("yourAttrName", new Hashtable());

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