myfaces.apache.org/extensions can't resolve

[Heather]

I did some examples of JSF with tags:

<%@ taglib uri="http://myfaces.apache.org/extensions" prefix="x"%>

but it returned to me this exception

javax.servlet.ServletException:absolute uri: http://myfaces.apache.org/extensions can't resolve or in web.xml or in jar files

what is the problem?

[Jack]

this page doesn't exist, and when it tries to search the URI finds an error over there
Change the address to an existing address

[Ed]

You need some jar that contains that you want
and change the http://myfaces.apache.org/extensions route
to the route of this jar