我做的有几个模块，用户管理和模块的管理，在用户管理中并没有出现关于session异常的现象，可是在做模块管理的时候却出现了异常，代码都类似，后来在百度搜好像是关于session的线程管理问题，我的web.xml中已经配置：
<filter>
<filter-name>openSessionInViewFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInViewFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
DAO类中的代码如下：
public void delModule(int moduleId) {
Module module = findById(moduleId);
if(module.getChildren().size()>0)
{
throw new RuntimeException("模块【"+module.getName()+"】存在有子模块，不允许删除");
}
getHibernateTemplate().delete(module);
}
public Module findModule(int moduleId) {
Session session = this.getSession();
Query query = session.createQuery("from Module as m where m.id="+moduleId);
return (Module)query.uniqueResult();
}
public Module findById(int moduleId)
{
Module module=(Module)getHibernateTemplate().load(Module.class, moduleId);
return module;
}
在delModule中，我分别调用findModule(int moduleId)，和findById(int moduleId)获取module对象，可是调用时出现的错误分别是:
2009-5-24 12:06:03 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet default threw exception
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:43)
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:101)
at org.hibernate.event.def.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:52)
at org.hibernate.impl.SessionImpl.fireDelete(SessionImpl.java:766)
at org.hibernate.impl.SessionImpl.delete(SessionImpl.java:744)
at org.springframework.orm.hibernate3.HibernateTemplate$25.doInHibernate(HibernateTemplate.java:848)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:842)
at org.springframework.orm.hibernate3.HibernateTemplate.delete(HibernateTemplate.java:838)
at org.myy.manager.impl.ModuleManager.delModule(ModuleManager.java:27)
at org.myy.action.ModuleManagerAction.delMod(ModuleManagerAction.java:143)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
...
和
12:08:31,361 ERROR LazyInitializationException:19 - could not initialize proxy - no Session
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:57)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:150)