spring事务异常，xml配置也不好用

异常信息：
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:1135)
at org.springframework.orm.hibernate4.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:620)
at org.springframework.orm.hibernate4.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:617)

spring中事务配置：

<bean id="txManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory"></property>
    <property name="nestedTransactionAllowed" value="true" />
</bean>


<!-- <tx:annotation-driven transaction-manager="txManager" proxy-target-class="true"
    mode="proxy" /> -->

aop:config
expression="execution(* com.h3c.itac.order.service.*.*(..))" />
advice-ref="txAdvice" />
/aop:config

tx:attributes




/tx:attributes
/tx:advice

service层：
package com.h3c.itac.order.service;
方法：
public void saveSyslogAlarm(SyslogAlarm s){
dao.saveSyslogAlarm(s);
}

http://www.cnblogs.com/iuranus/archive/2012/08/02/2620364.html