Spring security custom LogoutHandler not called

I've implemented my own LogoutHandler and I'm trying to configure it in the spring security xml, but for some reason it's not being called on logout (the logout is successful, but my code isn't executed).

This is my security.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.1.xsd">

<security:http use-expressions="true">
    <security:intercept-url pattern="/logoutSuccess"
        access="permitAll" />

<security:logout logout-url="/logout"
        logout-success-url="/logoutSuccess" />
</security:http>

<bean id="logoutFilter"
    class="org.springframework.security.web.authentication.logout.LogoutFilter">
    <constructor-arg index="0" value="/logoutSuccess" />
    <constructor-arg index="1">
        <list>
            <bean id="securityContextLogoutHandler"
                class="org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler" />
            <bean id="myLogoutHandler" class="my.package.MyLogoutHandler" />
        </list>
    </constructor-arg>
    <property name="filterProcessesUrl" value="/logout" />
</bean>

MyLogoutHandler - this is what I want to execute on logout, but it's not being called:

import org.springframework.security.web.authentication.logout.LogoutHandler;

public class MyLogoutHandler implements LogoutHandler {

@Override
public void logout(HttpServletRequest request, HttpServletResponse response, Authentication authentication) {

    System.out.println("logout!");

    }
}

Does anyone have any idea why it's not working? Thanks!