Problem with WAR file on Tomcat4 on testing

[David Goodenough <david.goodenough@btconnect.com>]

I have a WAR file which runs quite happily on the Sun JWSDP packaged version
of Tomcat 4, but will not run on the tomcat4 package on Debian.

The WAR file has two servlets and some JSPs, an HTML page and all the
necessary web.xml, dtds and jars properly packaged in their correct
directories.  It had one error which was that it had the old location
in web.xml for the web-app_2_3.dtd, but I have fixed that.

The WAR file is places in /var/lib/tomcat4/webapps, and during startup
tomcat finds the webapp, and says it is initialising it deploying it as
expected.

Then is complains about an internal error, file 
javax/servlet/resources/web-app_2_3.dtd not found.  Now this should
be in servlet.jar, which actually is in two places, firstly in 
common/lib/servlet.jar and also in WEB-INF/lib/servlet.jar, but 
it would appear not to be finding either.  Now I suppose it it possible
that it is actually complaining about having two of these, but that
is certainly not what it is saying.

Then the servlets are initialised, I have some debug messages that
come from the init methods, and they are in the log.  

Then I come to try to use the servlets, and all I get is resource
not found 404 errors.

Anyone got any ideas as to what might be the problem?

David