How/When to Close Hibernate Session?

Question

I have an error after closing Hibernate Session

public String listarTodosClientes() {
    session.getTransaction().begin();
    List<Cliente> lista = session.createCriteria(Cliente.class).list();
    session.close();
    return lista.toString();
}

After Session.close() the toString() method generates an Exception. But if I remove Session.close(). The code works. And now I can leave the sitting open?

p.s: return number string was just an example. could be returning some item from the list.

Answer 1

RESOLVED.

Solution!

public String listarTodosClientes() {
    session.getTransaction().begin();
    List<Cliente> lista = session.createCriteria(Cliente.class).list();
    String retorno = lista.toString();
    session.close();
    return retorno;
}