Affects Version/s: None
Fix Version/s: None
It appears the jsr315 spec group may have wanted to make a new feature of having error-pages without defining a code or exception name. Unfortunately there is no text about this in the 3.0 final specification. See section 10.9.2 Error Pages. This is not mentioned.
Nor is there any comment in the web-common.xsd schema.
The only information on this feature can be found on a blog from someone from oracle:
If this is indeed a new feature that was added in servlet 3.0, this must be documented in the specification.