Struts2 session expired
===

I am using struts2jquery grid plugin for my app. I am using interceptor for session timeout and I am configuring my session timeout in web.xml, But the problem is after session timeout it is not going to required page say login.jsp , my struts.xml is as follows..

    ....

    <interceptors>
			<interceptor name="SessionCheckInterceptor" class="com.org.SessionCheckInterceptor" />
			<interceptor-stack name="testSessionValidationStack">
				<interceptor-ref name="SessionCheckInterceptor" />
				<interceptor-ref name="defaultStack" />
			</interceptor-stack>	
		</interceptors>
    ...
    <action name="mytable" class="com.org.MyTable">
        	<interceptor-ref name="testSessionValidationStack"/>	
            <result name="success" type="json"/>            
            <result name="error">messages.jsp</result>
            <result name="sessionexpired">login.jsp</result>
        </action>
    ...

I able to go in interceptor class while debug but it not redirect me to the login page. Please anybody tell me what is the problem in my code?