Write operations are not allowed in read-only mode

SpringMVC+Hibernate測試更新、添加數據時，報錯以下：

org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.MANUAL): Turn your Session into FlushMode.COMMIT/AUTO or remove 'readOnly' marker from transaction definition.
	at org.springframework.orm.hibernate4.HibernateTemplate.checkWriteOperationAllowed(HibernateTemplate.java:1128)
	at org.springframework.orm.hibernate4.HibernateTemplate$14.doInHibernate(HibernateTemplate.java:648)
	at org.springframework.orm.hibernate4.HibernateTemplate.doExecute(HibernateTemplate.java:341)
	at org.springframework.orm.hibernate4.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:309)
	at org.springframework.orm.hibernate4.HibernateTemplate.update(HibernateTemplate.java:645)
	at org.springframework.orm.hibernate4.HibernateTemplate.update(HibernateTemplate.java:640)
	at dao.UserDaoImpl.updateUser(UserDaoImpl.java:65)
	at service.UserServiceImpl.updateUser(UserServiceImpl.java:63)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:302)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:201)
	at com.sun.proxy.$Proxy41.updateUser(Unknown Source)
	at controller.UserController.updateUser(UserController.java:103)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
	at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:653)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:151)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)

查了半天，有說在web.xml中添加openSessionInViewFilter，以下：

<filter>  
	    <filter-name>openSessionInViewFilter</filter-name> 
	    <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
	  	<!--  
	  	<init-param>
	      <param-name>singleSession</param-name>
	      <param-value>true</param-value>
	    </init-param>
	     singleSession默認爲true,若設爲false則等於沒用OpenSessionInView 
	     -->
	     
	  	<init-param>    
	 		<param-name>flushMode</param-name>     
	 		<param-value>AUTO</param-value>  
			<!-- 	默認flushMode是NEVER,有些狀況下會報異常，故設置爲AUTO-->
	 	</init-param> 
  </filter> 
  
  
   <filter-mapping>
  	<filter-name>openSessionInViewFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>

可是我已經加了，同樣報錯。

又有說在beans.xml中加上openSessionInViewInterceptor，以下：

<bean name="openSessionInViewInterceptor" class="org.springframework.orm.hibernate4.support.OpenSessionInViewInterceptor">
		<property name="sessionFactory" ref="sessionFactory"/>
	</bean>

可是我也試了，仍然報錯。後來按提示

remove 'readOnly' marker from transaction definition.

在service層加上@Transactional,以下：

@Override
	@Transactional
	public void updateUser(User user) {
		userDao.updateUser(user);

	}

問題解決。由於@Transactional 的readonly默認爲false(boolean readOnly() default false;)。加了openSessionInViewFilter，就須要配置事務。