Possible error in book?

roberto_sc · **Joined:** Wed Nov 12, 2008 12:07 pm **Posts:** 21

Hello
In page 712 of Java Persistence with Hibernate, in the GenericHibernateDAO, if you are meant to return the persisted entity shouldn't you do:

Code:

public T makePersistent(T entity) {
       entity = (T) getSession().saveOrUpdate(entity);
        return entity;
    }

?

christian · **Posted:** Thu May 21, 2009 4:36 pm

Of course not, because saveOrUpdate() is return type void.

roberto_sc · **Joined:** Wed Nov 12, 2008 12:07 pm **Posts:** 21

Sorry, merge/saveOrUpdate confusion!

How can I overcome the problem of persisting 2 objects of same class that has an association with a third object of other class (with cascade) without creating 2 rows for this third object?

roberto_sc · **Joined:** Wed Nov 12, 2008 12:07 pm **Posts:** 21

I mean, I had to use merge() because of the NonUniqueObjectException problem (because I have a client - outside of JBoss - using the EJB DAO in JBoss, so session is always closed after the method execution), but now I have this problem since merge() returns a new instance of the persisted object and the second object still points to the old-non-persisted instance of the object.