使用 Spring 整合 Hibernate, 在懒加载的情况下, 有时候需要在 JSP/View 层显示数据, 这时候就要用到Spring内置的: OpenSessionInViewFilter, 一般来说配置如下(web.xml):

						<
						filter
						>
						<
						filter-name
						>hibernateFilter</filter-name><filter-class>
        org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
    </filter-class><init-param><param-name>singleSession</param-name><param-value>true</param-value></init-param><!-- 和 spring 中的sesssionfactory ID 一致 --><init-param><param-name>sessionFactoryBeanName</param-name><param-value>sessionFactory</param-value></init-param></filter><filter-mapping><filter-name>hibernateFilter</filter-name><url-pattern>*.do</url-pattern><!-- *.jsp, *.do--></filter-mapping>
不过, 这时候又会导致更新数据时抛出如下异常:
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.

这时候再去网上找解决方案, 会有人说: 把参数 singleSession改为false, 就行了. 不过, 改完后, 估计不久就会遇到另一个郁闷的异常:

org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions

这下完了, 两个方案都不行, 到底怎么办? 还好, 在http://xuliangyong.javaeye.com/blog/144818的主页上, 给了一个方案, 就是改写 OpenSessionInViewFilter 的代码, 非常感谢, 下面给出的就是最终方案:

web.xml

«/span> filter-name >hibernateFilter</filter-name>

«/span> filter-class > org.springframework.orm.hibernate3.support.OurOpenSessionInViewFilter </filter-class>

OurOpenSessionInViewFilter.java 代码:

package org.springframework.orm.hibernate3.support;

import org.hibernate.*;

/** * 单session模式下, 默认会发生无法提交的错误: * 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. * 需要设置FlushMode并刷新session. * 参考: http://xuliangyong.javaeye.com/blog/144818 * @author 刘长炯 */publicclass OurOpenSessionInViewFilter extends OpenSessionInViewFilter {

    public OurOpenSessionInViewFilter() {
        super.setFlushMode(FlushMode.AUTO);
    }

    protectedvoid closeSession(Session session, SessionFactory sessionFactory) {
        session.flush();

        try {
            session.getTransaction().commit();
        } catch (HibernateException e) {
            // TODO Auto-generated catch block//e.printStackTrace();
        }

        super.closeSession(session, sessionFactory);
    }
}

如果各位有更好的解决方案, 欢迎讨论哦!!!

题外话:

感觉 Spring + Hibernate 的健壮性还是不够啊! 容易抛异常, 这是事实, 也许这是开源软件的通病吧.

转载请注明:WebLogic Android 博客 » OpenSessionInViewFilter的两个异常:Illegal attempt to associate a collection with two open sessions; Write operations are not allowed in read-only mode (FlushMode.NEVER/MANUAL)