Think JPWH has a mistake

deusaquilus · **Joined:** Thu Feb 12, 2009 5:37 pm **Posts:** 1

I think Java Persistence With Hibernate has a mistake on p423. It has a code sample that looks something like:

Code:

EntityManager em = emf.createEntityManager();
EntityTransaction tx = em.getTransaction();
tx.begin();
Item item = em.find(Item.class, new Long(1234));
tx.commit();
item.setDescription(...);
tx.begin();
User user = em.find(User.class, new Long(3456));
user.setPassword("secret");
tx.commit();
em.close();

And then it says:

Quote:

...in the second transaction, you not only load a User object, but also update the modified persistent item when the second transaction is committed (in addition to an update for the dirty
user instance).

But item.setDescription(...) is not called within the second transaction in the example code, item.setDescription(...) should be moved one line down. Is this correct?

littypreethkr · **Posted:** Fri Feb 13, 2009 8:18 am

No its not a mistake. What it means is the item.setDescription(...); happed after the transaction is commited and so item is dirty (ie. not in sync with DB). So the next commit will commit the modifications done to the User object and the update done to the "dirty" item.