PropertyNotFoundException does not work with custom error in web.xml

[Tomcat Random]

I have a custom error servlet set up in my webapps web.xml file like so:

<error-page>
        <exception-type>java.lang.RuntimeException</exception-type>
        <location>/runtimeExceptionHandler</location>
</error-page>

In JSTL if a property is spelled incorrectly or doesn't exist, the
PropertyNotFoundException will not trigger the error servlet, even though
PNFEs extend RuntimeException. Anyone know why this is?

Tomcat 7.037 on Win7.

TIA
Alec