关于 java:Spring Security 身份验证管理器不会在自定义过滤器上被选中

SEVERE: Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘myUsernamePasswordAuthenticationFilter’ defined in file [*snip*]:
Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: authenticationManager must be specified
…
Caused by: java.lang.IllegalArgumentException: authenticationManager must be specified
at org.springframework.util.Assert.notNull(Assert.java:112)

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:sec="http://www.springframework.org/schema/security"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.2.xsd
    http://www.springframework.org/schema/security
    http://www.springframework.org/schema/security/spring-security-3.1.xsd">

<context:property–placeholder location="classpath*:META-INF/spring/*.properties" />
<context:spring–configured />
<context:component–scan base–package="myapp" />

<!– Spring Security Configuration. –>
<sec:http auto–config="false" entry–point–ref="loginUrlAuthenticationEntryPoint"
        access–denied–page="/denied.jsp">
    <sec:custom–filter position="FORM_LOGIN_FILTER" ref="myAuthenticationFilter" />

    <sec:intercept–url pattern="/login" access="IS_AUTHENTICATED_ANONYMOUSLY" />
    <sec:intercept–url pattern="/404.jsp" access="IS_AUTHENTICATED_ANONYMOUSLY" />
    <sec:intercept–url pattern="/index.jsp" access="IS_AUTHENTICATED_ANONYMOUSLY" />
    <sec:intercept–url pattern="/**" access="ROLE_USER" />

    <sec:logout logout–url="/logout" logout–success–url="/login" />
</sec:http>
<sec:authentication–manager alias="authenticationManager">
    <sec:authentication–provider ref="myAuthenticationProvider" />
</sec:authentication–manager>

<bean id="loginUrlAuthenticationEntryPoint" class="org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint">
    <property name="loginFormUrl" value="/login" />
</bean>
<bean id="myAuthenticationFilter" class="myapp.MyUsernamePasswordAuthenticationFilter">
    <property name="authenticationManager" ref="authenticationManager" />
</bean>
<bean id="myAuthenticationProvider" class="myapp.MyAuthenticationProvider" />

@Component
public class MyUsernamePasswordAuthenticationFilter extends AbstractAuthenticationProcessingFilter {
public AdminUsernamePasswordAuthenticationFilter() {
    super("/login");
}

@Override
public Authentication attemptAuthentication(final HttpServletRequest request,
        final HttpServletResponse response) throws AuthenticationException {
    // stuff and:
    return getAuthenticationManager().authenticate(new UsernamePasswordAuthenticationToken(
            login, request.getParameter("password")));
}
}

@Component
public class MyAuthenticationProvider implements AuthenticationProvider {
@Override
public Authentication authenticate(final Authentication authentication) throws AuthenticationException {
    // all the funky AD+DB code
    return null;
}

@Override
public boolean supports(final Class< ? > clazz) {
    return true;
}
}