Spring Security 定义多个authentication-manager出问题

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.1.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
xmlns="http://www.springframework.org/schema/security">
<!-- 不限制访问的url -->
<http security="none" pattern="/admin/loginUI.do*" />
<http security="none" pattern="/admin/login.jsp*" />
<http security="none" pattern="/index.jsp*" />
<!-- 不拦截图片，js，css -->
<http pattern="/**/*.jpg" security="none" />  
   <http pattern="/**/*.png" security="none" />  
   <http pattern="/**/*.gif" security="none" />  
   <http pattern="/**/*.css" security="none" />  
   <http pattern="/**/*.js" security="none" />

    <http  entry-point-ref="loginUrlEntryPoint" access-denied-page="/notaccess.jsp">
<!-- 前台页面拦截  -->
<intercept-url pattern="/users/**" access="ROLE_USERS" />
<intercept-url pattern="/views/web/users/**" access="ROLE_USERS" />
<!-- 后台页面拦截 -->
<intercept-url pattern="/admin/**" access="ROLE_ADMIN" />
<intercept-url pattern="/views/admin/**" access="ROLE_ADMIN" />

<!-- 前台前置拦截器调用 -->
<custom-filter ref="webMyUsernamePasswordAuthenticationFilter" before="FORM_LOGIN_FILTER"/> 
<!-- 后台前置拦截器调用 -->
<custom-filter ref="myUsernamePasswordAuthenticationFilter" position="FORM_LOGIN_FILTER"/> 
</http>

<!-- 认证切入点，这里使用它的目的是保证当用户登录之前就访问前后台时，会跳转到不同的登录页面 -->
<beans:bean id="loginUrlEntryPoint" class="net.xqx.security.loginUrlEntryPoint" />
    


    <!-- 配置自己写的前置拦截器 -->
<beans:bean class="net.xqx.security.WebMyUsernamePasswordAuthenticationFilter" id="webMyUsernamePasswordAuthenticationFilter">
<beans:property name="authenticationManager" ref="webAuthenticationManager"></beans:property>
<beans:property name="authenticationSuccessHandler" ref="WebloginLogAuthenticationSuccessHandler"></beans:property>
<beans:property name="authenticationFailureHandler" ref="webSimpleUrlAuthenticationFailureHandler"></beans:property>
</beans:bean>

<!-- 验证成功后页面跳转 -->
 <beans:bean id="WebloginLogAuthenticationSuccessHandler"  
        class="org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler">  
        <beans:property name="defaultTargetUrl" value="/users/usersCenter.do"></beans:property>  
    </beans:bean>  
    
    <!-- 验证失败后页面跳转 -->
    <beans:bean id="webSimpleUrlAuthenticationFailureHandler"  
        class="org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler">  
        <!-- 可以配置相应的跳转方式。属性forwardToDestination为true采用forward false为sendRedirect -->  
        <beans:property name="defaultFailureUrl" value="/usersLoginUI.do?error=1"></beans:property>  
    </beans:bean> 

<!-- userDetailsService配置 -->
<beans:bean class="net.xqx.security.WebUserDetailsServiceImpl" id="webUserDetailsService" />
<!-- 调用userDetailsService,并增加别名alias为自己写的前置拦截器提供调用 -->
<authentication-manager alias="webAuthenticationManager">
<authentication-provider user-service-ref="webUserDetailsService" >
           </authentication-provider>
</authentication-manager>




<!-- 配置自己写的前置拦截器 -->
<beans:bean class="net.xqx.security.MyUsernamePasswordAuthenticationFilter" id="myUsernamePasswordAuthenticationFilter">
<beans:property name="authenticationManager" ref="authenticationManager"></beans:property>
<beans:property name="authenticationSuccessHandler" ref="loginLogAuthenticationSuccessHandler"></beans:property>
<beans:property name="authenticationFailureHandler" ref="simpleUrlAuthenticationFailureHandler"></beans:property>
</beans:bean>

<!-- 验证成功后页面跳转 -->
 <beans:bean id="loginLogAuthenticationSuccessHandler"  
        class="org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler">  
        <beans:property name="defaultTargetUrl" value="/admin/login.do"></beans:property>  
    </beans:bean>  
    
    <!-- 验证失败后页面跳转 -->
    <beans:bean id="simpleUrlAuthenticationFailureHandler"  
        class="org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler">  
        <!-- 可以配置相应的跳转方式。属性forwardToDestination为true采用forward false为sendRedirect -->  
        <beans:property name="defaultFailureUrl" value="/admin/loginUI.do?error=1"></beans:property>  
    </beans:bean> 
    <!-- userDetailsService配置 -->
<beans:bean lazy-init="true" class="net.xqx.security.UserDetailsServiceImpl" id="userDetailsService" />
<!-- 调用userDetailsService,并增加别名alias为自己写的前置拦截器提供调用 -->
<authentication-manager alias="authenticationManager">
<authentication-provider user-service-ref="userDetailsService" >
           </authentication-provider>
</authentication-manager>

</beans:beans>
无论我怎么设置，它总是只调用 net.xqx.security.UserDetailsServiceImpl 这个实现类，把后台的这个配置放到最前面，系统又只会调用net.xqx.security.WebUserDetailsServiceImpl 这个实现类，实在是搞不出来了 spring security --------------------编程问答-------------------- 楼主，你好！请问你这个问题解决了吗？我也遇到这个问题，不能配置多个认证管理器，如果配置多个，最后一个会覆盖前面所配置的。好像认证管理器只能配置全局。

补充：Java ,  Java EE