cas单点登录如何获取更多信息

现在有个新的系统（SpringMVC+Spring+Mybatis），我为它添加了一个单点登录功能。只是在本地客户端的web.xml文件里，添加了以下配置

<!-- 用于单点退出，该过滤器用于实现单点登出功能，可选配置-->
<listener>
<listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
</listener>
<!-- 该过滤器用于实现单点登出功能，可选配置 -->
<filter>
<filter-name>CAS Single Sign Out Filter</filter-name>
<filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS Single Sign Out Filter</filter-name>
<url-pattern>/*</url-pattern>
<!-- <url-pattern>http://localhost:8080/jix/login/Login/tuic</url-pattern> -->
</filter-mapping>
<filter>
<filter-name>CAS Filter</filter-name>
<filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
<init-param>
<param-name>casServerLoginUrl</param-name>
<!-- <param-value>https://server.jix.com:8443/cas/login</param-value> -->
<param-value>http://10.65.102.169:8081/sso</param-value>
</init-param>
<!-- 后面加的-->
<init-param>
<param-name>renew</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>gateway</param-name>
<param-value>false</param-value>
</init-param>
<!-- 后面加的-->
<init-param>
<param-name>serverName</param-name>
<param-value>http://localhost:8080</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CAS Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 该过滤器负责对Ticket的校验工作，必须启用它 -->
<filter>
<filter-name>CAS Validation Filter</filter-name>
<filter-class>
org.jasig.cas.client.validation.Cas10TicketValidationFilter</filter-class>
<!-- <filter-class>
com.tianjian.util.common.filter.ValidationFilter</filter-class> -->
<init-param>
<param-name>casServerUrlPrefix</param-name>
<!-- <param-value>https://server.jix.com:8443/cas</param-value> -->
<param-value>http://10.65.102.169:8081/sso</param-value>
</init-param>
<init-param>
<param-name>serverName</param-name>
<param-value>http://localhost:8080</param-value>
</init-param>
<!-- 后面加的 -->
<init-param>
<param-name>useSession</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>redirectAfterValidation</param-name>
<param-value>true</param-value>
</init-param>
<!-- 后面加的 -->
</filter>
<filter-mapping>
<filter-name>CAS Validation Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--
该过滤器负责实现HttpServletRequest请求的包裹，比如允许开发者通过HttpServletRequest的getRemoteUser()方法获得SSO登录用户的登录名，可选配置。
-->
<filter>
<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
<filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--
该过滤器使得开发者可以通过org.jasig.cas.client.util.AssertionHolder来获取用户的登录名。比如AssertionHolder.getAssertion().getPrincipal().getName()。
-->
<filter>
<filter-name>CAS Assertion Thread Local Filter</filter-name>
<filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CAS Assertion Thread Local Filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

单点登录功能也能实现，只能从客户端获取登录的用户名AssertionHolder.getAssertion().getPrincipal().getName()  。

但是我需要获取其他更多信息的时候，AssertionHolder.getAssertion().getPrincipal().getAttributes()获取到的内容一直为空。

远程服务器在公司那里，我改不到，但是远程服务器配置应该没有问题。因为另一个系统用的struts2，我看了他的部分代码，AssertionHolder.getAssertion().getPrincipal().getAttributes()也能获取到其他用户相关的信息。所以我觉得是不是我自己本地的配置有问题啊，希望有大神来帮我解答。