[jboss-user] [EJB 3.0] - Re: How to lazily load collections?

[michael.litherland]

Yes, of course you're right the exception occurred when JSF tried to display the data model, so essentially when the JSP was rendered.


  |     public List<TdmAlerts> getAlertsFromEntity(MyEntity entity) {
  |         entityManager.refresh(entity);
  |         List<TdmAlerts> result = new ArrayList();
  |         result.addAll(entity.getTdmAlerts());
  |         return result;
  |     }
  | 

I changed the code to this and I get the same failure:


  | 16:22:55,838 ERROR [LazyInitializationException] failed to lazily initialize a collection of role: com.ati.raa.entities.MyEntity.tdmAlerts, no session or session was closed
  | org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.ati.raa.entities.MyEntity.tdmAlerts, 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.read(AbstractPersistentCollection.java:86)
  |         at org.hibernate.collection.PersistentBag.toArray(PersistentBag.java:254)
  |         at java.util.ArrayList.addAll(ArrayList.java:473)
  |         at com.ati.raa.bl.EntityLogicBean.getAlertsFromEntity(EntityLogicBean.java:144)
  | 

So that refresh doesn't have the effect that I desired, namely to access that entity in the current session's context.  Any other thoughts?  Since the entity manager goes so far out of its way to hide the concept of sessions that it clearly depends on, it makes this hard for me to understand the right way to do this.

Also, what is this VO/TO you speak of?

Thanks much,
Mike

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