Lazy Initialization Problem with Hibernate PersistentSet

y25zhao · **Joined:** Thu May 08, 2008 2:16 pm **Posts:** 3

The following is my code:

Code:

    @SuppressWarnings("unchecked")
    public static void main(String[] args) {
        HibernateUtil.getSession();

        List b = new ArrayList();        
        b.add("1");
        b.add("2");
        
        List a = new org.hibernate.collection.PersistentList();
        a.addAll(b);
    }

And I got the following exception:

Code:

17:25:01,628  INFO SettingsFactory:294 - Deleted entity synthetic identifier rollback: disabled
17:25:01,628  INFO SettingsFactory:309 - Default entity-mode: pojo
17:25:01,628  INFO SettingsFactory:313 - Named query checking : enabled
17:25:01,691  INFO SessionFactoryImpl:161 - building session factory
17:25:02,644  INFO SessionFactoryObjectFactory:82 - Not binding factory to JNDI, no JNDI name configured
17:25:02,816 ERROR LazyInitializationException:19 - 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:358)
   at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
   at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
   at org.hibernate.collection.AbstractPersistentCollection.write(AbstractPersistentCollection.java:183)
   at org.hibernate.collection.PersistentList.addAll(PersistentList.java:189)
   at com.rim.mvs.configio.exception.Test.main(Test.java:35)
Exception in thread "main" org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed
   at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
   at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
   at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
   at org.hibernate.collection.AbstractPersistentCollection.write(AbstractPersistentCollection.java:183)
   at org.hibernate.collection.PersistentList.addAll(PersistentList.java:189)
   at com.rim.mvs.configio.exception.Test.main(Test.java:35)

Does anyone can point out what the problem is? Thanks.

Allen

nagkumar · **Posted:** Sat Jun 14, 2008 12:42 am

Hi,

Do not create and use PersistentList.. PersistantList impl of hibernate is used for fetching and storing records to and from associated database. Hence when u add a object to the list, it looks for session to know sync up etc.

Regards,
Nagendra