[jboss-user] [EJB 3.0] - Re: Detach entities - Obtaining a clear pojo

[ALRubinger]

Not sure if I'm necessarily understanding the issue but...

Most times we encounter a LazyInitilizationException when trying to iterate over relationships outside the scope of the session/transaction; when sent to a remote client, for example.

In these cases I like to call on a little utility method to ensure the association's objects are stored in a Collection of type I dictate:


  | class PersistenceUtils
  | 
  |         /**
  | 	 * Returns a Collection of all objects in the specified persistentCollection
  | 	 * without binding to any persistence context or session.
  | 	 * 
  | 	 * @param <T>
  | 	 * @param targetCollection
  | 	 * @param persistentCollection
  | 	 * @return
  | 	 */
  | 	public static <T> Collection<T> getCollectionItemsRemovedFromPersistenceContext(
  | 			Collection<T> targetCollection, Collection<T> persistentCollection) {
  | 		// If runtime type of persistentCollection is not PersistentCollection,
  | 		// take no action
  | 		if (!(persistentCollection instanceof PersistentCollection))
  | 			return persistentCollection;
  | 
  | 		// Clear existing target
  | 		targetCollection.clear();
  | 
  | 		// Place all items in persistent collection into target
  | 		for (T item : persistentCollection) {
  | 			targetCollection.add(item);
  | 		}
  | 
  | 		// Return target
  | 		return targetCollection;
  | 	}

...and I can easily call it by:

Collection<MyType> associations = new ArrayList<MyType>();
  | 
  | associations = PersistenceUtils
  | 				.getCollectionItemsRemovedFromPersistenceContext(
  | 						associations,
  | 						myAttachedObject.getAttachedAssociations());
  | 


...also, while responding here, found this post with a similar solution:

http://www.mojavelinux.com/blog/archives/2006/06/hibernate_get_out_of_my_pojo/

S,
ALR

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