web-app is not bound as a global element
Which is a deployment error.
DEPLOYMENTS IN ERROR
The cause was an erroneous web-app declaration in my web.xml file. Here is the correct one:
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<!-- ... -->
</webapp>
I needed 2.4 to enable EL (Expression Language) by default. Versions 2.3 and lower of the Servlet API ignore EL.
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