Spring bean没有被注入到JSF托管bean(它是一个抽象的超类)中

Question

我有一个名为FooBean的抽象超类bean，所有其他bean都扩展了这个类。我已经在applicationContext文件中连接了我的dao，我想把它注入到这个超类bean中，这样每次我在一个bean中，我都可以访问dao。问题是，每当我试图访问子类中的dao时，都会得到NullPointerException。以下文件仅显示了spring设置的相关配置细节:

web . xml:

<listener>
   <listener-class>
      org.springframework.web.context.ContextLoaderListener
   </listener-class>
</listener>
<listener>
   <listener-class>
      org.springframework.web.context.request.RequestContextListener
   </listener-class>
</listener>
<context-param>
   <description>Spring configuration files location.</description>
   <param-name>contextConfigLocation</param-name>
   <param-value>/WEB-INF/config/applicationContext-*.xml</param-value>
</context-param>

faces-config.xml:

<application>
   <variable-resolver>org.springframework.web.jsf.DelegatingVariableResolver</variable-resolver>
   <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
...
</application>

FooBean.java:

public abstract class FooBean implements Serializable {
   protected transient FooService dao;
   public void setFooService(FooService dao){
      this.dao = dao;
   }
}

applicationContext-service.xml:

<bean id="serviceTemplate" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" abstract="true">
        <property name="transactionManager" ref="transactionManager"/>
        <property name="transactionAttributes">
            <props>
                <prop key="*"/>
                <!--
                <prop key="save*">PROPAGATION_REQUIRED</prop>
                <prop key="delete*">PROPAGATION_REQUIRED</prop>
                <prop key="remove*">PROPAGATION_REQUIRED</prop>
                <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
                <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
                -->
            </props>
        </property>
    </bean>
    <!-- Definition of service targets -->
    <bean id="fooServiceTarget" class="com.foo.service.FooService">
        <property name="fooDAO" ref="fooDAO"/>
        <property name="adminDAO" ref="adminDAO"/>
        <property name="channelsDAO" ref="channelsDAO"/>
    </bean>
    <bean id="fooService" parent="serviceTemplate">
        <property name="target" ref="fooServiceTarget"/>
    </bean>

applicationContext-hibernate.xml:

<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName" value="jdbc/FooDataSource"/>
    </bean>
    <!-- Hibernate SessionFactory -->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mappingResources">
            <list>
                <!--value>com/Foo/model/General.hbm.xml</value-->
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.bytecode.use_reflection_optimizer">true</prop>
                <prop key="hibernate.search.default.directory_provider">filesystem</prop>
                <prop key="hibernate.search.default.indexBase">/usr/lucene/indexes</prop>
                <!--prop key="hibernate.cache.provider_class">org.hibernate.cache.SwarmCacheProvider</prop-->
            </props>
        </property>
    </bean>
    <!-- Transaction manager for a single Hibernate SessionFactory (alternative to JTA) -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>
    <!-- Spring Data Access Exception Translator Defintion -->
    <bean id="jdbcExceptionTranslator" class="org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator"/>
    <bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
        <property name="sessionFactory" ref="sessionFactory"/>
        <property name="jdbcExceptionTranslator" ref="jdbcExceptionTranslator"/>
    </bean>
    <!-- Add DAO's here and create separate application context for service -->
    <bean id="FooDAO" class="com.foo.service.dao.impl.FooDAOHibernate">
        <property name="hibernateTemplate" ref="hibernateTemplate"/>
    </bean>
    <bean id="adminDAO" class="com.foo.service.dao.impl.AdminDAOHibernate">
        <property name="hibernateTemplate" ref="hibernateTemplate"/>
    </bean>
    <bean id="channelsDAO" class="com.foo.service.dao.impl.ChannelsDAOHibernate">
        <property name="hibernateTemplate" ref="hibernateTemplate"/>
    </bean>

我已经尝试过但没有成功的事情:

• 尝试在FooBean类字段上使用@ManagedProperty(value="#{FooService}")

• 尝试在faces-config.xml中定义bean以注入spring bean:

  com.foo.beans.FooBean没有一个fooService# {fooService}

• 定义具有空指针的子类bean作为spring bean，并通过spring beans xml文件注入该属性。

具有讽刺意味的是，我可以在FooBean抽象类的构造函数中放置以下代码并注入dao(但我不想使用这段代码，我希望spring注入它):

WebApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(getRequest().getServletContext());
        dao = (FooService)ctx.getBean("fooService");

Answer 1

(我本来想把这篇文章作为评论，但我没有足够的声誉)

如果你使用了@ManagedProperty，那么你也应该声明它为@ManagedBean。

而且，我没有在任何applicationContext.xml文件中看到FooBean，所以我不明白Spring如何"知道"它

Answer 2

相信这与jsf bean的使用方式有关。当请求一个新bean时，由于在部署时实例化了Spring inject，因此不会注入dao。它在构造函数中工作的原因是bean是为请求创建的，然后你获得应用程序上下文并抓取dao Singleton。