DO NOT REPLY [Bug 4450] - Warn if incorrect DTD referenced

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=4450

Warn if incorrect DTD referenced





------- Additional Comments From craig.mcclanahan@sun.com  2001-10-29 10:30 -------
This behavior is actually an artifact of how XML parsers process DOCTYPE
entities.

Basically, the parser calls resolveEntity() on the PUBLIC identifier (the part
that starts "-//Sun ...").  If a local copy of the DTD cannot be found, then and
only then does it try to use the SYSTEM identifier (the http://... part) to look
up the DTD.

Tomcat registers a local copy of all the DTDs it uses, so it will always find
the internal copy -- among other things, this means that you can run Tomcat on a
machine disconnected from the Internet.  It also makes things start up faster,
even on a network-connected machine, because no retrieval of the DTD is
required.

Right now, Tomcat doesn't ever read the web.xml file itself -- it simply asks
the XML parser to read it.  Adding a warning message as you suggest would
require an extra pass through the file at startup time to produce the message --
is it really worth slowing down application startup for this?  I'm inclined to
say no, so I'm marking this as a "WONTFIX".  Feel free to reopen it if you feel
strongly that Tomcat should be able to do this for you.

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