The jsp-file directive in web.xml allows mapping of JSPs to concrete URLs:
<servlet>
<servlet-name>My Hidden Page</servlet-name>
<jsp-file>/mydir/foo.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>My Hidden Page</servlet-name>
<url-pattern>/hidden</url-pattern>
</servlet-mapping>
Shame on me, I didn’t know about this.
As seen here: