Help Ejb 3 In Action page 304

[Mamadou Touré]

Hi Folks,
I`m a little bit confused at page 304 of the EJB3 in action with the code below

public Item undoItemChanges(Item item)
entityManager.refresh(entityManager.merge(item));
return item;

The purpose of the code is to undo the changes made on the item, so why don't we just say entityManager.refresh(item), insted of passig again the entityManager.merge(item) as an argument to the refresh method ??

It's the same thing with the second method when it comes to deleting an item ( why domn't we just say entityManager.remove(item) instead of entityManager.remove(entityManager.merge(item)) ??

[Deepika Joshi]

try this thread