java - In CustomLogoutSuccessHandler , The authentication object is always null -

i getting null authentication object in custom logoutsuccesshandler, not sure issue. :(

here spring-security file:

    <sec:http auto-config="true" entry-point-ref="ssoprocessingfilterentrypoint"         access-decision-manager-ref="affirmativebased">         <sec:intercept-url pattern="/afterauthn/**" access="${spring.security.role}" />         <sec:intercept-url pattern="/tenancy/**" access="${spring.security.role}" />         <!-- add permissions specific urls - i.e. iam.user.read /resources/** -->         <sec:intercept-url pattern="/**"             access="${default.permission}" />         <sec:logout invalidate-session="true" delete-cookies="true"             success-handler-ref="customlogoutsuccesshandler" />         <sec:custom-filter ref="ssoauthenticationfilter"             position="pre_auth_filter" />         <sec:session-management>             <sec:concurrency-control max-sessions="1" />         </sec:session-management>     </sec:http> .. <bean id="customlogoutsuccesshandler"         class="usermgmt.service.customlogoutsuccesshandler">          <property name="defaultlogoutsuccessurl" value="${service.provider.logout.success.url}"/>     </bean> 

my custom class handler:

public class customlogoutsuccesshandler implements logoutsuccesshandler { @override     public void onlogoutsuccess(httpservletrequest request, httpservletresponse response, authentication authentication)             throws ioexception, servletexception {         if (authentication == null) {             system.out.println("null");         } else {             system.out.println("not null");         } }} 

over here, authentication null , spring security version 3.1.0.release