为何OpenSessionInView不能同时保存和删除,郁闷!

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Hibernate Java ORM Web SUN

因为lazy的问题,还是采用了OpenSessionInView
一开始我的web.xml配置文件如下:

    <filter>
        <filter-name>opensession</filter-name>
        <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
    </filter>
写了个保存的代码测试了一下,报如下的错误:

org.springframework.dao.InvalidDataAccessApiUsageException: Write operations
are not allowed in read-only mode (FlushMode.NEVER) - turn your Session
into FlushMode.AUTO or remove 'readOnly' marker from transaction definition
        at org.springframework.orm.hibernate3.HibernateTemplate.checkWriteOperationAllowed(HibernateTemplate.java:1076)
        at org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:616)
        at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:366)
        at org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:614)
        at com.phopesoft.security.service.impl.UserServiceImpl.addUser(UserServiceImpl.java:40)
        at com.phopesoft.security.web.UserAction.add(UserAction.java:52)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:365)

在javaeye中搜索了一下,发现了Readonly的帖子,将web.xml修改为如下:

<filter>
        <filter-name>opensession</filter-name>
        <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
        <init-param>
            <param-name>singleSession</param-name>
            <param-value>false</param-value>
        </init-param>
    </filter>

保存的代码顺利通过测试,但是删除的代码却不能通过了.出现如下的错误:

org.hibernate.HibernateException: Illegal attempt to associate a collection
with two open sessions
        at org.hibernate.collection.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:410)
        at org.hibernate.event.def.OnUpdateVisitor.processCollection(OnUpdateVisitor.java:40)
        at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101)
        at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:61)
        at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55)
        at org.hibernate.event.def.AbstractVisitor.process(AbstractVisitor.java:123)
        at org.hibernate.event.def.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:72)
        at org.hibernate.impl.SessionImpl.fireDelete(SessionImpl.java:790)
        at org.hibernate.impl.SessionImpl.delete(SessionImpl.java:768)
        at org.springframework.orm.hibernate3.HibernateTemplate$25.doInHibernate(HibernateTemplate.java:772)
        at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:366)
        at org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:766)
        at org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:762)

同样在论坛里面搜索到遇到这个问题的朋友,回帖说去掉singleSession!

迷惑了