Spring 事务下 openSessionInViewFilter flushMode 的问题

这是 applicationContext.xml

<!--
*************************************
以下定义的是系统中的数据源，class 属性定义了连接数据源的类的路径
<property> 标签定义的是 hibernate 数据源文件的路径
*************************************
-->
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation">
<value>/WEB-INF/classes/hibernate.cfg.xml</value>
</property>
</bean>


<!--
*************************************
以下定义了 Spring 所提供的 hibernate3 的事务管理器，
该事务管理器采用设值注入的方式使用了 sessionFactory 定义的数据源
*************************************
-->
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sessionFactory" />
</property>
</bean>

<bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">   
    <property name="transactionManager" ref="transactionManager"/>   
    <property name="transactionAttributes"> 
        <props> 
            <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
                    <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>
                    <prop key="load*">PROPAGATION_REQUIRED,readOnly</prop>
                    <prop key="save*">PROPAGATION_REQUIRED</prop>
                    <prop key="add*">PROPAGATION_REQUIRED</prop>
                    <prop key="update*">PROPAGATION_REQUIRED</prop>
                    <prop key="remove*">PROPAGATION_REQUIRED</prop>
        </props> 
    </property> 
</bean>
<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">   
<property name="beanNames"> 
    <value>UserServiceImpl</value> 
</property> 
<property name="interceptorNames">   
        <list>   
<value>transactionInterceptor</value>   
<!--此处增加新的Interceptor -->   
</list>   
</property>   
</bean>

<bean class="org.springframework.transaction.interceptor.TransactionAttributeSourceAdvisor">   
<property name="transactionInterceptor" ref="transactionInterceptor"/>   
</bean>

<bean id="UserServiceImpl" class="service.UserServiceImpl" autowire="byName" />
<!--
*************************************
以下 bean 定义了 Spring 的 HibernateTemplate，
当需要在程序中直接对持久化层进行访问时，
可以直接使用 Spring 提供的 HibernateTemplate 类进行操作
*************************************
-->
<bean id="infoMsgsDAO" class="dao.InfoMsgsDAO">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>

<!-- Ajax -->
<bean name="/ajax" class="struts.action.advinfo.AjaxAction">
<property name="userServiceImpl">
<ref bean="UserServiceImpl"/>
</property>
</bean>

这是 UserServiceImpl 代码

import dao.InfoContextlistDAO;
import dao.InfoFeedbackDAO;
import dao.InfoMsgsDAO;

public class UserServiceImpl implements IUserService {

private InfoContextlistDAO infoContextlistDAO;
private InfoFeedbackDAO infoFeedbackDAO;
private InfoMsgsDAO infoMsgsDAO;

public void setInfoContextlistDAO(InfoContextlistDAO infoContextlistDAO){
this.infoContextlistDAO = infoContextlistDAO;
}

public InfoContextlistDAO getInfoContextlistDAO(){
return this.infoContextlistDAO;
}

public void setInfoFeedbackDAO(InfoFeedbackDAO infoFeedbackDAO){
this.infoFeedbackDAO = infoFeedbackDAO;
}

public InfoFeedbackDAO getInfoFeedbackDAO(){
return this.infoFeedbackDAO;
}

public void setInfoMsgsDAO(InfoMsgsDAO infoMsgsDAO){
this.infoMsgsDAO = infoMsgsDAO;
}

public InfoMsgsDAO getInfoMsgsDAO(){
return this.infoMsgsDAO;
}
}


这是 UserServiceImpl 的接口 IUserService

package service;

import dao.InfoContextlistDAO;
import dao.InfoFeedbackDAO;
import dao.InfoMsgsDAO;

public interface IUserService {

public void setInfoContextlistDAO(InfoContextlistDAO infoContextlistDAO);

public InfoContextlistDAO getInfoContextlistDAO();

public void setInfoFeedbackDAO(InfoFeedbackDAO infoFeedbackDAO);

public InfoFeedbackDAO getInfoFeedbackDAO();

public void setInfoMsgsDAO(InfoMsgsDAO infoMsgsDAO);

public InfoMsgsDAO getInfoMsgsDAO();

}



按道理事务也配置成功了，可是为什么还是报这个错误：

javax.servlet.ServletException: org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.NEVER) - turn your Session into FlushMode.AUTO or remove 'readOnly' marker from transaction definition
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
filter.MemberLimitFilter.doFilter(MemberLimitFilter.java:53)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)