Easiest way to manage JPA/Hibernate transactions in swing app - swing

Question

I have this java swing app with one thread, one database connection.
Anytime the user saves or edits something a have to write something like this:
private void buttonClickedActionPerformed(java.awt.event.ActionEvent evt) {
EntityManager em = sessionFactory.openSession();
EntityTransaction et = null;
try {
et = em.getTransaction();
et.begin();
// save, merge, update ...
et.commit();
}
catch(PersistenceException pe) {
if(et != null) et.rollback();
}
finally {
if(em != null) em.close();
}
}
I see in some tutorials references to transactions managed by the container or something like that for web apps. What about desktop? Am I missing something here? Do I really need to write all this transaction code every time?

Answer 1

A DAO could look like:
public class BaseDao {
protected EntityManager em;
public BaseDao() {
EntityMangerFactory emf = Persistence.createEntityMangerFactory("<your PU>");
em = emf.createEntityMangerFactory();
}
public <E> E find(Class<E> clazz, Serializable id) {
return em.find(clazz, id);
}
public <E> E getReference(Class<E> clazz, Serializable id) {
return em.getReference(clazz, id);
}
public void persist(Object entity) {
EntityTransaction transaction = em.getTransaction();
transaction.begin();
em.persist(entity);
transaction.commit();
}
... and any other methods of the EntityManager.