The servlet spec already allows a webapp to serve customized error pages based on an exception type or response status code. This feature, which is available only on a per-webapp basis, is supported by 8.1.
If I understand you correctly, you want to be able to customize the default error page that is inherited by all web applications that do not declare customized error pages (using the servlet spec mechanism mentioned above). This feature, which is configurable at the virtual server level, was added in 8.2
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