Open Session in View or DTO solution - spring

Question

I was wondering if this recipe does not use Open Session in View or Dozer works (the scenario is a spring, jsf, hibernate application):
I have this in back-end module:
public abstract class AbstractMap<E extends Serializable> implements Mapper<E> {
public abstract E map(E e) ;
public List<E> map(List<E> l) {
List<E> map = new ArrayList<E>();
for (E t : l) {
map.add(this.map(t));
}
return map;
}
}
#Component
public class PersonService extends AbstractService<Person>{
#Autowired
PersonDAO personDao;
#Transacted
public List<Person> findPeople(Mapper<Person> m, PersonFilter filter) {
return m.map(personDao.findByFilter(filter));
}
}
In front-end I have this jsb bean:
#Component
#Scope("session")
public class PersonBean {
#Autowired
PersonService personService;
PersonFilter personFilter;
List<Person> getPeople() {
return personService.findPeople(new AbstractMap<People>() {
public Person map(Person person) {
Person dto = new Person();
dto.setName(person.getName());
dto.setAddresses(new AbstractMap<Address>() {
public Address map(Address a) {
Address dto = new Address();
dto.setStreet(a.getStreet());
return dto;
}
}.map(person.getAddresses()));
return dto;
}
}, personFilter);
}
}
From my point of view has some advantages:
front-end must to indicate that it want to retrieve every invocation to back-end.
if need use a mapper in more than a place, I can move map code to a external class.
back-end open and close transaction.
don't need duplicate code to define DTOs for Person and Address.
What problems that could cause this proposed solution?