acegi rememberMeService为何无效？

我想做一个选择2周内不需重复登录的。但是无效。求高手看看。
 这是登录界面的的checkbox：<input type="checkbox"  name="remember_me"/>两周内不必重复登录</td>
配置文件：<bean id="filterChainProxy" class="org.acegisecurity.util.FilterChainProxy">
<property name="filterInvocationDefinitionSource">
<value>
CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON
PATTERN_TYPE_APACHE_ANT
/**=httpSessionContextIntegrationFilter,logoutFilter,authenticationProcessingFilter,rememberMeProcessingFilter,anonymousProcessingFilter,exceptionTranslationFilter,filterInvocationInterceptor
</value>
</property>
</bean>
<bean id="authenticationManager" class="org.acegisecurity.providers.ProviderManager">
<property name="providers">
<list>
<ref local="daoAuthenticationProvider" />
<ref local="anonymousAuthenticationProvider" />
<ref local="rememberMeAuthenticationProvider" />
</list>
</property> </bean>
<bean id="rememberMeProcessingFilter"
class="org.acegisecurity.ui.rememberme.RememberMeProcessingFilter">
<property name="rememberMeServices" ref="rememberMeServices" />
<property name="authenticationManager" ref="authenticationManager" />
</bean>
<bean id="rememberMeServices"
class="org.acegisecurity.ui.rememberme.TokenBasedRememberMeServices">
<property name="tokenValiditySeconds" value="432000" />
<property name="parameter" value="remember_me" />
<property name="key" value="springRocks" />
<property name="userDetailsService" ref="userDetailsService" />
</bean>
 哪里错了？