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

[Wolfgang Knauf]

Hi Michael,

here is a sample snippet where accessing the relationship fails with your exception:

public MyEntity getEntity(object pk) {
  | MyEntity entity = (MyEntity) entityManager.find(MyEntity.class, pk);
  | //Will NOT load the data !
  | entity.getTdmAlerts();
  | return entity;
  | }

I found that just accessing the collection property of the entity does NOT fetch its content.

You have to do something which forces the collection to load its items. In the following piece of code I access the collections size:
public MyEntity getEntity(object pk) {
  | MyEntity entity = (MyEntity) entityManager.find(MyEntity.class, pk);
  | int iSize = entity.getTdmAlerts().size();
  | return entity;
  | }

I suggest to add a parameter "boolean bFetchAlerts" to "getEntity" which controls whether the alerts are loaded or not.

I hope this helps

Wolfgang

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