How to create a global error page?

I created a small application, for which I need a global error page. I know how to navigate through the jsp page through iserrorpage and errorpage. And I'm getting the error page. When I have any error in my servlet I'm not getting the error page displayed. So I need a global error page. Can anyone help on this?
Thanks.

Please do not crosspost the same question over all places. It is rude in terms of netiquette.

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