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POWeired session error in lazy-fetch
 

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    <p>The error is <code>failed to lazily initialize a collection, no session or session was closed</code>.</p> <p>There are many people asked nearly the same question, but the resolution are not so much intuitive. And, I think it's necessary to post another question to describe the strange error message:</p> <p>(I'm not going to paste the source codes here because it's too long.)</p> <blockquote> <pre><code>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 [org.hibernate.impl.SessionImpl@19006c9] for Hibernate transaction DEBUG [main] (HibernateTransactionManager.java:523) - Not preparing JDBC Connection of Hibernate Session [org.hibernate.impl.SessionImpl@19006c9] 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.&lt;init&gt;(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 [org.hibernate.impl.SessionImpl@19006c9] DEBUG [main] (HibernateTransactionManager.java:734) - Closing Hibernate Session [org.hibernate.impl.SessionImpl@19006c9] after transaction </code></pre> </blockquote> <p>As you see, when lazy-fetch is trigged, the error occurred, there already have a thread-bound session, and it's not yet closed until the transaction is rolled back.</p> <p>So, why it reports there is <code>no session or session was closed</code>?</p> <p><strong>EDIT</strong> The related source:</p> <pre><code>@Transactional public void tcList() { for (Cat cat : dao.list()) { System.out.println("Saved cat: " + cat); } } </code></pre>
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