错误为failed to lazily initialize a collection, no session or session was closed
。延迟获取会话错误
有很多人问几乎相同的问题,但分辨率并不那么直观。而且,我觉得有必要发布另一个问题来形容奇怪的错误信息:(我不打算在这里粘贴的源代码,因为它太长)
DEBUG [main] (AbstractPlatformTransactionManager.java:365) - Creating new transaction with name [com.bee32.plover.orm.feaCat.FeaturePlayer.tcList]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; '' DEBUG [main] (HibernateTransactionManager.java:493) - Opened new Session [[email protected]] for Hibernate transaction DEBUG [main] (HibernateTransactionManager.java:523) - Not preparing JDBC Connection of Hibernate Session [[email protected]] DEBUG [main] (HibernateTemplate.java:397) - Found thread-bound Session for HibernateTemplate Hibernate: /* criteria query */ select ... ERROR [main] (LazyInitializationException.java:42) - failed to lazily initialize a collection, no session or session was closed org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:380) ... at java.util.HashSet.<init>(HashSet.java:116) ... at org.hibernate.loader.Loader.list(Loader.java:2124) ... at org.springframework.orm.hibernate3.HibernateTemplate$5.doInHibernate(HibernateTemplate.java:590) ... DEBUG [main] (HibernateTemplate.java:422) - Not closing pre-bound Hibernate Session after HibernateTemplate DEBUG [main] (AbstractPlatformTransactionManager.java:843) - Initiating transaction rollback DEBUG [main] (HibernateTransactionManager.java:672) - Rolling back Hibernate transaction on Session [[email protected]] DEBUG [main] (HibernateTransactionManager.java:734) - Closing Hibernate Session [[email protected]] after transaction
正如你所看到的,当lazy-fetch被触发时,发生错误,已经有一个线程绑定的会话,并且在事务回滚之前它还没有关闭。
那么,它为什么报告有no session or session was closed
?
编辑 的相关来源:
@Transactional
public void tcList() {
for (Cat cat : dao.list()) {
System.out.println("Saved cat: " + cat);
}
}
你在JUnit测试用例中运行这个吗? – 2011-03-17 19:30:17