使用idea 集成 spring 和struts2 配置文件出错

applicationContext.xml:

     <bean id="umAction" class="com.ssh2.action.UserManagerAction" scope="prototype">
        <property name="userBiz" ref="userBiz" />
    </bean>

struts.xml:

     <package name="default" extends="struts-default">
        <action name="doLogin" class="umAction"> //这里报错Cannot resolve class 'umAction'
            <result name="error">error.jsp</result>
            <result name="success">success.jsp</result>
        </action>
    </package>

web.xml:

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 指定Spring配置文件的位置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

目录结构：

请问是怎么回事儿，谢谢大家了

报错处的class应该指定Action类的全类名（包名+类名），如果只写类名，自然找不到。