realm中注入userService失败，这是什么原因？

Question

web.xml中的配置

<!--加载spring配置文件到容器中-->

contextConfigLocation
classpath:spring*.xml


org.springframework.web.context.ContextLoaderListener

<!--设置字符集-->
<filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>utf-8</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!--shiro与spring集成-->
<filter>
    <filter-name>shiroFilter</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    <init-param>
        <param-name>targetFilterLifecycle</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>shiroFilter</filter-name>
    <url-pattern>/* </url-pattern>
</filter-mapping>

<!--springMVC-->
<servlet>
    <servlet-name>demoServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:/spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>demoServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

spring_shiro.xml中的配置

<bean id="cacheManager" class="shiro.EhCacheManager">
    <property name="cacheManagerConfigFile" value="classpath:ehcache.xml"/>
</bean>

<!-- Realm实现 -->
<bean id="credentialsMatcher" class="shiro.MyHashedCredentialsMatcher">
    <constructor-arg ref="cacheManager"/>
    <property name="hashAlgorithmName" value="md5"/>
    <property name="hashIterations" value="2"/>
    <property name="storedCredentialsHexEncoded" value="true"/>
</bean>
<bean id="userRealm" class="shiro.UserRealm">
    <property name="credentialsMatcher" ref="credentialsMatcher"/>
    <property name="cachingEnabled" value="true"/>
    <property name="authenticationCachingEnabled" value="true"/>
    <property name="authenticationCacheName" value="authenticationCache"/>
    <property name="authorizationCachingEnabled" value="true"/>
    <property name="authorizationCacheName" value="authorizationCache"/>
</bean>

<!-- 会话DAO -->
<bean id="sessionIdGenerator"
      class="org.apache.shiro.session.mgt.eis.JavaUuidSessionIdGenerator"/>
<bean id="sessionDAO"
      class="org.apache.shiro.session.mgt.eis.EnterpriseCacheSessionDAO">
    <property name="activeSessionsCacheName" value="shiro-activeSessionCache"/>
    <property name="sessionIdGenerator" ref="sessionIdGenerator"/>
</bean>

<!-- 会话验证调度器 -->
<bean id="sessionValidationScheduler"
      class="org.apache.shiro.session.mgt.quartz.QuartzSessionValidationScheduler">
    <property name="sessionValidationInterval" value="1800000"/>
    <property name="sessionManager" ref="sessionManager"/>
</bean>
<!-- 会话Cookie模板 -->
<bean id="sessionIdCookie" class="org.apache.shiro.web.servlet.SimpleCookie">
    <constructor-arg value="sid"/>
    <property name="httpOnly" value="true"/>
    <property name="maxAge" value="180000"/>
</bean>
<!-- 会话管理器 -->
<bean id="sessionManager"
      class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">
    <property name="globalSessionTimeout" value="1800000"/>
    <property name="deleteInvalidSessions" value="true"/>
    <property name="sessionValidationSchedulerEnabled" value="true"/>
    <property name="sessionValidationScheduler" ref="sessionValidationScheduler"/>
    <property name="sessionIdCookieEnabled" value="true"/>
    <property name="sessionIdCookie" ref="sessionIdCookie"/>
    <property name="sessionDAO" ref="sessionDAO"/>
</bean>

<!-- 安全管理器 -->
<bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
    <property name="realm" ref="userRealm"/>
    <property name="sessionManager" ref="sessionManager"/>
    <property name="cacheManager" ref="cacheManager"/>
</bean>
<!-- 相当于调用SecurityUtils.setSecurityManager(securityManager) -->
<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="staticMethod"
              value="org.apache.shiro.SecurityUtils.setSecurityManager"/>
    <property name="arguments" ref="securityManager"/>
</bean>

<!-- Shiro的Web过滤器 -->
<bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
    <property name="securityManager" ref="securityManager"/>
    <property name="loginUrl" value="/login.jsp"/>
    <property name="successUrl" value="/"/>
    <property name="unauthorizedUrl" value="/unauthorized.jsp"/>
    <property name="filters">
        <util:map>
            <entry key="authc" value-ref="formAuthenticationFilter"/>
        </util:map>
    </property>
    <property name="filterChainDefinitions">
        <value>
               /**=anon
        </value>
    </property>
</bean>
<!-- 基于Form表单的身份验证过滤器 -->
<bean id="formAuthenticationFilter"
      class="org.apache.shiro.web.filter.authc.FormAuthenticationFilter">
    <property name="usernameParam" value="username"/>
    <property name="passwordParam" value="password"/>
    <property name="loginUrl" value="/login.jsp"/>
</bean>

<!-- Shiro生命周期处理器-->
<bean id="lifecycleBeanPostProcessor"
      class="org.apache.shiro.spring.LifecycleBeanPostProcessor"/>

Answer 1

http://www.oschina.net/question/593111_164461?sort=time