Write operations are not allowed in read-only mode 只读模式下(FlushMode.NEVER/MANUAL)写操作不允许
2013-04-26 16:14
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第一种解决办法
org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.NEVER/MANUAL): Turn your Session into FlushMode.COMMIT/AUTO or remove 'readOnly' marker from transaction definition.
问题:只读模式下(FlushMode.NEVER/MANUAL)写操作不被允许:把你的Session改成FlushMode.COMMIT/AUTO或者清除事务定义中的readOnly标记。
错误原因:
OpenSessionInViewFilter在getSession的时候,会把获取回来的session的flush mode 设为FlushMode.NEVER。然后把该sessionFactory绑定到TransactionSynchronizationManager,使request的整个过程都使用同一个session,在请求过后再接除该sessionFactory的绑定,最后closeSessionIfNecessary根据该session是否已和transaction绑定来决定是否关闭session。在这个过程中,若HibernateTemplate
发现自当前session有不是readOnly的transaction,就会获取到FlushMode.AUTO Session,使方法拥有写权限。也即是,如果有不是readOnly的transaction就可以由Flush.NEVER转为Flush.AUTO,拥有insert,update,delete操作权限,如果没有transaction,并且没有另外人为地设flush
model的话,则doFilter的整个过程都是Flush.NEVER。所以受transaction(声明式的事务)保护的方法有写权限,没受保护的则没有。
解决方法:
web.xml配置里添加
如果在交给spring 管理的情况下,在beans.xml 里的配置
一般这个错误是事务引起的,如果确定事务没有问题,还是有这个错,可以重写OpenSessionInViewFilter的2个方法
在myfaces的wiki里提供了OpenSessionInViewFilter的一个子类如下:
org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read-only mode (FlushMode.NEVER/MANUAL): Turn your Session into FlushMode.COMMIT/AUTO or remove 'readOnly' marker from transaction definition.
问题:只读模式下(FlushMode.NEVER/MANUAL)写操作不被允许:把你的Session改成FlushMode.COMMIT/AUTO或者清除事务定义中的readOnly标记。
错误原因:
OpenSessionInViewFilter在getSession的时候,会把获取回来的session的flush mode 设为FlushMode.NEVER。然后把该sessionFactory绑定到TransactionSynchronizationManager,使request的整个过程都使用同一个session,在请求过后再接除该sessionFactory的绑定,最后closeSessionIfNecessary根据该session是否已和transaction绑定来决定是否关闭session。在这个过程中,若HibernateTemplate
发现自当前session有不是readOnly的transaction,就会获取到FlushMode.AUTO Session,使方法拥有写权限。也即是,如果有不是readOnly的transaction就可以由Flush.NEVER转为Flush.AUTO,拥有insert,update,delete操作权限,如果没有transaction,并且没有另外人为地设flush
model的话,则doFilter的整个过程都是Flush.NEVER。所以受transaction(声明式的事务)保护的方法有写权限,没受保护的则没有。
解决方法:
web.xml配置里添加
<filter> <filter-name>OpenSessionInViewFilter</filter-name> <filter-class> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter </filter-class> <init-param> <param-name>sessionFactoryBeanName</param-name> <param-value>sessionFactory</param-value> </init-param> <init-param> <param-name>singleSession</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name> flushMode </param-name> <param-value>AUTO </param-value> </init-param> </filter> // 。。。。 <filter-mapping> <filter-name>OpenSessionInViewFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
如果在交给spring 管理的情况下,在beans.xml 里的配置
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <aop:config> <aop:pointcut id="bussinessService" expression="execution(* com.fan.service.base.*.*(..))" /> <aop:advisor pointcut-ref="bussinessService" advice-ref="txAdvice" /> </aop:config> <tx:advice id="txAdvice" transaction-manager="txManager"> <tx:attributes> <tx:method name="get*" read-only="false" propagation="NOT_SUPPORTED"/> <tx:method name="find*" read-only="false" propagation="NOT_SUPPORTED"/> <tx:method name="save*" propagation="REQUIRED"/> // 如果不把save update delete都配置上, <tx:method name="update*" propagation="REQUIRED"/> //这些操作会无效 <tx:method name="delete*" propagation="REQUIRED"/> </tx:attributes> </tx:advice>第二种是重写下OpenSessionInViewFilter
一般这个错误是事务引起的,如果确定事务没有问题,还是有这个错,可以重写OpenSessionInViewFilter的2个方法
在myfaces的wiki里提供了OpenSessionInViewFilter的一个子类如下:
public class OpenSessionInViewFilter extends org.springframework.orm.hibernate3.support.OpenSessionInViewFilter { /** * we do a different flushmode than in the codebase * here */ protected Session getSession(SessionFactory sessionFactory) throws DataAccessResourceFailureException { Session session = SessionFactoryUtils.getSession(sessionFactory, true); session.setFlushMode(FlushMode.COMMIT); return session; } /** * we do an explicit flush here just in case * we do not have an automated flush */ protected void closeSession(Session session, SessionFactory factory) { session.flush(); super.closeSession(session, factory); } }
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