关于Acegi方法级别保护的问题

<bean id="autoProxyCreator" class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">  
        <property name="interceptorNames">
            <value>securityInterceptor</value>
        </property>
        <property name="beanNames">
            <list>
               <value>aopService</value>
            </list>
        </property>
    </bean>

<bean id="securityInterceptor" class="net.sf.acegisecurity.intercept.method.aopalliance.MethodSecurityInterceptor">
        <property name="validateConfigAttributes"><value>true</value></property>
        <property name="authenticationManager">
           <ref bean="authenticationManager"/>
        </property>
        <property name="accessDecisionManager">
           <ref local="httpRequestAccessDecisionManager"/>
        </property>
        <property name="runAsManager"><ref bean="runAsManager"/></property>
        <property name="objectDefinitionSource">
           <value>
              web.aop.aopService.sayhello=AUTH_USER1dd 
           </value>
        </property>
    </bean>

public class aopService implements aop{

public void sayhello() {
System.out.println("hello world);
}

public void saybye() {
System.out.println("good bye);
}
}