Spring and AuthenticationListener

[Blaise Gervais]

I everyone, I use Shiro with Spring into a Webapp. And I need to count
logged users. So I will use AuthenticationListener but I'm unable to find
how to add the listener to an Authenticator..It seems that only subclasses
of AbstractAuthenticator can receive a list of AuthenticationListener but I
don't know how to access it.
 Here is my application context :
<bean id="myrealm" class="me.myapp.security.ShiroUserSecurityProvider">
<constructor-arg type="me.myapp.services.UserService" ref="userService" />
 </bean>
 <bean id="securityManager"
class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
    <property name="realm" ref="myrealm"/>
</bean>
 <bean id="authenticationListener"
class="me.myapp.security.ShiroAuthenticationListener" />
  <bean id="shiroFilter"
class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
    <property name="securityManager" ref="securityManager"/>
    <property name="loginUrl" value="/ui/login"/>

    <property name="filterChainDefinitions">
        <value>
            # some example chain definitions:
            /ui/login = anon
            /ui/** = authc, user, currentUserIntegrationFilter
            # more URL-to-FilterChain definitions here
        </value>
    </property>
</bean>

Thanks