@Secured does not work in controller, but intercept-url seems to be working fine

It doesn't look like @Secured on methods in my @Controller are being read. When security filtering based on sec:intercept-url is being used, this seems to be working just fine. The following code results in Spring Security giving me this log entry:

DEBUG: org.springframework.security.web.access.intercept.FilterSecurityInterceptor - Public object - authentication not attempted

web.xml

contextConfigLocation /WEB-INF/spring/root-context.xml

<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- Processes application requests -->
<servlet>
    <servlet-name>appServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/spring/appServlet/servlet-context.xml
        </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<!-- Filter security -->
<filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
    <filter-name>springSecurityFilterChain</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

servlet-context.xml holds the configuration of the viewResolvers and all the marshalling. This configuration is annotation-driven.

root-context.xml

    <sec:global-method-security secured-annotations="enabled" />

<sec:http au