Unable to instantiate Action ,user,defined for ‘login’ in namespace '/user'user.

java 跳转时 报错
web.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>zll</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext-*.xml,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>
</web-app>applicationcontext.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
                    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
                        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
    
    
    <bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>

<!-- 定义事务通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="get*" read-only="true" propagation="NOT_SUPPORTED"/>
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice> <!--定义切面，并将事务通知和切面组合（定义哪些方法应用事务规则） -->
<aop:config>
<aop:pointcut id="transactionPointcut" expression="execution(* com.netbank.biz.impl.*.*(..))" />
<aop:advisor advice-ref="txAdvice" pointcut-ref="transactionPointcut"/>
</aop:config>

<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="url" value="jdbc:mysql://localhost:3306/ssh"></property>
<property name="username" value="root"></property>
<property name="password" value="950425"></property>
</bean>

<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>com/zll/entity/Admin.hbm.xml</value>
<value>com/zll/entity/Account.hbm.xml</value>
<value>com/zll/entity/Employee.hbm.xml</value></list>
</property></bean>

<bean id="userDao" class="com.zll.dao.impl.UserDaoImpl">
   <property name="sessionFactory" ref="sessionFactory"></property>
</bean>

<bean id="userService" class="com.zll.service.impl.UserServiceImpl">
       <property name="userDao" ref="userDao"></property>
</bean>

<bean name="user" class="com.zll.action.UserAction" scope="prototype">
  <property name="userService" ref="userService" />
 </bean>

</beans> struts.xml配置
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts> <constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <constant name="struts.devMode" value="true" />
<constant name="struts.i18n.encoding" value="UTF-8"/>
<constant name="struts.objectFactory" value="spring"/>
<constant name="struts.configuration.xml.reload" value="true"></constant>
  
 
 <!-- 定义一个名称为user的包，继承struts 2的默认包，指定命名空间为"/user" -->
<package name="user" extends="struts-default" namespace="/user" >
    <!-- 使用通配符实现动态方法调用 -->
<action name="login" class="user" method="login">
<result name="success">/index.jsp</result>
<result name="login">/login.jsp</result>
<result name="input">/login.jsp</result>
</action>
</package> 
</struts>