Write operations are not allowed in read-only mode (FlushMode.NEVER/MANUAL): Turn your Session into

Write operations are not allowed in read-only mode (FlushMode.NEVER/MANUAL): Turn your Session into FlushMode.COMMIT/AU

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.
at

org.springframework.orm.hibernate3.HibernateTemplate.checkWriteOper

ationAllowed(HibernateTemplate.java:1095)

这个异常产生的主要原因是DAO采用了Spring容器的事务管理策略，如果操作方法的名称和事务策略中指定的被管理的名称不能够匹配上，spring 就会采取默认的事务管理策略(PROPAGATION_REQUIRED,read only).如果是插入和修改操作，就不被允许的，所以包这个异常

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);
        }
}